Diagnosis System [11/2023 - ]

Description of "Communication Bus Check" Screen

NOTE:

The following communication bus check screen is provided only as an example. This screen differs from the actual screen for this vehicle.

HINT:

The ECUs and sensors that are normally connected to the CAN communication system are displayed on the GTS.

Select "Communication Bus Check" on the menu screen of the GTS.
CAN Bus Check

HINT:

If items are not selected correctly in the vehicle specification pop up screen, the name of the CAN junction connector to which the ECUs or sensors are connected may not be displayed on the "Communication Bus Check" screen.
Confirm that the "Communication Bus Check" screen is displayed and the ECUs and sensors that have a history of being connected to the monitoring ECU are displayed.
HINT:
- Even if an ECU or sensor that is connected to a bus that is monitored by a bus monitoring ECU (gateway function equipped ECU) is not communicating, it will remain displayed on the "Communication Bus Check" screen.
- When an ECU or sensor that is connected to a bus that is not monitored by a bus monitoring ECU (gateway function equipped ECU) is not displayed on the "Communication Bus Check" screen, it means that it is not communicating.
- ECUs with a history of being connected are displayed even if the ECUs are removed.

The default display setting selected on the combo box is ALL. When checking for ECUs or sensors for a specific bus, choose the bus from the drop down list. ALL, each bus, each sub bus and Central Gateway are listed in the drop down list.

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Combo box

Background color is red or yellow

Item	Detail
Combo box: ALL	Displays all ECUs and sensors connected to the central bus and sub buses.
Combo box: Bus	Displays ECUs and sensors connected to the selected bus.
Combo box: Sub bus	Displays ECUs and sensors connected to the selected sub bus.
Combo box: Central Gateway	Displays all ECUs and sensors connected to the central bus.

NOTE:

When using the combo box, it may be possible to select a sub bus from the drop down list that does not have any connected ECUs or sensors. This is not a malfunction and occurs when there is no optional device connected to a sub bus which is monitored by a sub bus monitoring ECU (gateway function equipped ECU).
In the drop down list, all sub buses applicable to the model are displayed (e.g. LIN communication sub buses are also displayed). For information on sub buses necessary to diagnose the CAN communication system, refer to System Diagram.
Refer to SYSTEM DIAGRAM [11/2023 - ]

HINT:

The background color of an ECU or sensor changes according to its connection status as indicated in the following table.

DESCRIPTION OF "COMMUNICATION BUS CHECK" SCREEN

Bus Type	Background Color	Connection Status
Bus	White	Communication has been normal.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Currently not communicating (either of the following): Not communicating since the start of the CAN bus check Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Either of the following: The central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS.4 No ECUs or sensors are connected to the bus.5
Sub bus with a gateway function equipped ECU that does not memorize connected ECUs or sensors*2	White	Communication has been normal since the start of the CAN bus check.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Communication stop has continued since the start of the CAN bus check.*1
Sub bus with a gateway function equipped ECU that memorizes connected ECUs and sensors*3	White	Communication has been normal.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Currently not communicating (either of the following): Not communicating since the start of the CAN bus check Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Either of the following: The gateway function equipped ECU cannot communicate with the central gateway ECU.6 No ECUs or sensors are connected to the sub bus.7

Gateway function equipped ECUs relay signals between ECUs and sensors connected to different buses.
*1: An ECU or sensor is installed to the vehicle but is not displayed on the "Communication Bus Check" screen.
*2: The gateway function equipped ECU does not memorize ECUs and sensors connected to its respective sub bus.
*3: The gateway function equipped ECU memorizes ECUs and sensors connected to its respective sub bus.
*4: When the central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS, the name of buses, sub buses, ECUs and sensors will not be displayed.
*5: When no ECUs or sensors are connected to a bus, the message "There is no system found on the communication Bus." will be displayed.
*6: When a gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU), the name of sub buses and ECUs or sensors connected to the sub bus will not be displayed.
*7: When no ECUs or sensors are connected to the sub bus, the message "There is no system found on the communication Bus." will be displayed.
If there is no communication between the GTS and the vehicle, or no ECUs or sensors are displayed as connected, check the central gateway ECU (network gateway ECU) and diagnosis bus (The bus that connects the DLC3 to the central gateway ECU (network gateway ECU)) for malfunctions.

Monitor the screen for any ECU or sensor connection status changes for a period of 2 minutes.
HINT:
- If an open occurs in one of the wires of a CAN branch line, it may interfere with the communication of other ECUs or sensors resulting in an incorrect state being displayed.
- If the connection status changes intermittently during the inspection, repair the open in the branch line of the ECU or sensor that is not communicating, and then perform Communication Bus Check again.

Description of "Communication Bus Check (Detail)" Screen

NOTE:

The following communication bus check screen is provided only as an example. This screen differs from the actual screen for this vehicle.

HINT:

The communication error history of ECUs or sensors which have communication error history can be displayed on the "Communication Bus Check (Detail)" screen.

Select "Communication Bus Check" on the menu screen of the GTS.
CAN Bus Check

HINT:

If items are not selected correctly in the vehicle specification pop up screen, the name of the CAN junction connector to which the ECUs or sensors are connected may not be displayed on the "Communication Bus Check" screen.

Select "Detail" on the "Communication Bus Check" screen.

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Communication Bus Check (Detail)

Confirm that the "Communication Bus Check (Detail)" screen is displayed and the communication error history of the ECUs or sensors up to present is displayed.
HINT:
- Lost Communication Time and Lost Communication Trip are only displayed for the central bus.
- Lost Communication Time and Lost Communication Trip are not displayed for sub buses.

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Combo box

Background color is red

Item	Detail
Combo box: ALL	Displays all ECUs and sensors connected to the central bus and sub buses.
Combo box: Bus	Displays ECUs and sensors connected to the selected bus.
Combo box: Sub bus	Displays ECUs and sensors connected to the selected sub bus.
Combo box: Central Gateway	Displays all ECUs and sensors connected to the central bus.
Bus Monitoring ECU	Displays the gateway function equipped ECU which monitors the selected bus or sub bus.
Current Trip	Displays the total number of trips up to now*
Lost Communication Time(s)	Displays the longest period of time in seconds that the ECU or sensor connected to the central bus was not communicating.
Lost Communication Trip	Displays the trip in which the longest period of time that the ECU or sensor connected to the central bus was not communicating occurred.

*: If the component has been replaced with a new one, the total number of trips after the replacement is displayed.

NOTE:

The Lost Communication Time column displays the longest period of time in seconds that the central gateway ECU (network gateway ECU) detected a communication stop in the respective ECU or sensor.
The Lost Communication Trip column displays the trip in which the central gateway ECU (network gateway ECU) detected the longest communication stop in the respective ECU or sensor.
When using the combo box, it may be possible to select a sub bus from the drop down list that does not have any connected ECUs or sensors. This is not a malfunction and occurs when there is no optional device connected to a sub bus which is monitored by a sub bus monitoring ECU (gateway function equipped ECU).
In the drop down list, all sub buses applicable to the model are displayed (e.g. LIN communication sub buses are also displayed). For information on sub buses necessary to diagnose CAN communication system, refer to the System Diagram.
Refer to SYSTEM DIAGRAM [11/2023 - ]

HINT:

The background color of an ECU or sensor changes according to its connection status as indicated in the following table.

DESCRIPTION OF "COMMUNICATION BUS CHECK (DETAIL)" SCREEN

Bus Type	Background Color	Connection Status
Bus	White	Either of the following: Communication has been normal. Lost Communication Time is below 6 seconds.
	Red	Lost Communication Time is 6 seconds or more.
	Not displayed	Either of the following: The central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS.1 No ECUs or sensors are connected to the bus.2
Sub bus	White	Lost Communication Time is displayed as "-".
Sub bus	Not displayed	Either of the following: The gateway function equipped ECU cannot communicate with the central gateway ECU.3 No ECUs or sensors are connected to the sub bus.4

If there is no communication between the GTS and the vehicle, or no ECUs or sensors are displayed as connected, check the central gateway ECU (network gateway ECU) and diagnosis bus (The bus that connects the DLC3 to the central gateway ECU (network gateway ECU)) for malfunctions.
Lost Communication Time and Lost Communication Trip are not displayed for sub buses.
*1: When the central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS, the name of buses, sub buses, ECUs and sensors will not be displayed.
*2: When no ECUs or sensors are connected to a bus, the message "There is no system found on the communication Bus." will be displayed.
*3: When a gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU), the name of sub buses and ECUs or sensors connected to the sub bus will not be displayed.
*4: When no ECUs or sensors are connected to the sub bus, the message "There is no system found on the communication Bus." will be displayed.

Communication Bus Check (Communication Malfunction Check)

HINT:

DTCs related to CAN communication are displayed for each ECU on the GTS.

Select "Communication Bus Check" on the menu screen of the GTS.
CAN Bus Check

Select "Communication Malfunction Check" on the "Communication Bus Check" screen.

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Communication Malfunction Check

Confirm that the "Communication Malfunction Check" screen is displayed and CAN communication DTCs for each ECU are displayed.
HINT:

When there are no CAN communication DTCs stored, no DTCs will be displayed.

How to Use "Communication Bus Check" Screen in Inspection

NOTE:

The following CAN bus wiring diagram or communication bus check screen is provided only as an example. This wiring diagram or screen differs from the actual one for this vehicle.

HINT:

If the CAN communication system is currently malfunctioning, it is recommended to use Communication Bus Check rather than Communication DTCs for determining the suspected area.
Turn the ignition switch to ON, or perform the necessary operations to reproduce the problem symptom, select "Communication Bus Check" and wait approximately 2 minutes. Check the communication status of each ECU or sensor on the screen while performing this operation.

If the CAN communication system is currently malfunctioning, determine the suspected area using Communication Bus Check as follows:

PROBLEM SYMPTOMS TABLE

Problem Symptom Pattern	Display on Communication Bus Check Screen	Suspected Area
A	Almost all of the ECUs and sensors connected to the malfunctioning CAN bus are displayed as not communicating on the "Communication Bus Check" screen.	Short between CAN bus lines (CANH and CANL) Short to +B in a CAN bus line (CANH or CANL) Short to ground in a CAN bus line (CANH or CANL)
B	ECUs or sensors farther from the central gateway ECU (network gateway ECU) than the open in the wires are displayed as not communicating on the "Communication Bus Check" screen.	Open in both wires of a main bus line in the central bus
C	One ECU or sensor is displayed as not communicating on the "Communication Bus Check" screen.	Open in both wires of a branch line connected to an ECU or sensor in the central bus Internal malfunction of an ECU or sensor in the central bus Malfunction in the power supplied to an ECU or sensor in the central bus
D	No ECUs or sensors are displayed on the "Communication Bus Check" screen. All ECUs or sensors are displayed as not communicating on the "Communication Bus Check" screen.	Internal malfunction of the central gateway ECU (network gateway ECU) Malfunction in the power supplied to the central gateway ECU (network gateway ECU) Open in both wires of the branch line in the diagnosis bus (DLC3 - Central gateway ECU (network gateway ECU)) Short between CAN bus lines (CANH and CANL) in the diagnosis bus (DLC3 - Central gateway ECU (network gateway ECU)) Short to +B in a CAN bus line (CANH or CANL) in the diagnosis bus (DLC3 - Central gateway ECU (network gateway ECU)) Short to ground in a CAN bus line (CANH or CANL) in the diagnosis bus (DLC3 - Central gateway ECU (network gateway ECU))
E	One ECU or sensor is displayed as not communicating in multiple buses on the "Communication Bus Check" screen.	Internal malfunction of an ECU or sensor connected to multiple buses Malfunction in the power supplied to an ECU or sensor connected to multiple buses
F	Some ECUs or sensors are displayed as not communicating in the central bus and other ECUs or sensors are displayed as not communicating in a sub bus.	Open in a wire of a branch line connected to an ECU or sensor in the central bus Internal malfunction of an ECU or sensor in the central bus
G	A gateway function equipped ECU is displayed as not communicating in the central bus and ECUs and sensors connected to its respective sub bus are not displayed.	Open in both wires of a branch line connected to a gateway function equipped ECU Internal malfunction of a gateway function equipped ECU Malfunction in the power supplied to a gateway function equipped ECU
H	One ECU or sensor is displayed as not communicating in a sub bus on the "Communication Bus Check" screen.	Open in both wires of a branch line connected to an ECU or sensor in a sub bus Internal malfunction of an ECU or sensor in a sub bus Malfunction in the power supplied to an ECU or sensor in a sub bus
I	ECUs or sensors farther from the sub bus monitoring ECU (gateway function equipped ECU) than the open in the wires are displayed as not communicating on the "Communication Bus Check" screen.	Open in both wires of a main bus line in a sub bus

Problem Symptom Pattern A

Display on Communication Bus Check Screen	Almost all of the ECUs and sensors connected to the malfunctioning CAN bus are displayed as not communicating on the "Communication Bus Check" screen.
Details of Malfunction	Short between CAN bus lines (CANH and CANL) in Bus 2 Short to +B in a CAN bus line (CANH or CANL) in Bus 2 Short to ground in a CAN bus line (CANH or CANL) in Bus 2

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*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction Short between CAN bus lines (CANH and CANL) in bus lines Short to +B in a CAN bus line (CANH or CANL) in bus lines Short to ground in a CAN bus line (CANH or CANL) in bus lines	*f	Background color is red

HINT:

Due to the malfunction, almost all of the ECUs and sensors connected to Bus 2 will be displayed as not communicating and their background color will be red.
The malfunction in Bus 2 will not affect the other buses.
The malfunctioning part can be determined by inspecting for an open in the main bus line, a short between bus lines or a short to +B or ground.
Make sure to perform the inspection to measure resistances of buses to determine the cause of the malfunction.

Display on Communication Bus Check Screen	Almost all of the ECUs and sensors connected to the malfunctioning CAN bus are displayed as not communicating on the "Communication Bus Check" screen.
Details of Malfunction	Short between CAN bus lines (CANH and CANL) in Bus 4 Short to +B in a CAN bus line (CANH or CANL) in Bus 4 Short to ground in a CAN bus line (CANH or CANL) in Bus 4

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*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction Short between CAN bus lines (CANH and CANL) in bus lines Short to +B in a CAN bus line (CANH or CANL) in bus lines Short to ground in a CAN bus line (CANH or CANL) in bus lines	*f	Background color is red
*g	Not displayed	-	-

HINT:

Due to the malfunction, almost all of the ECUs and sensors connected to Bus 4 will be displayed as not communicating and their background color will be red.
The malfunction will not affect the other buses of the central bus. However, the sub bus connected to Bus 4 is likely to be affected. The gateway function equipped ECU connected to Bus 4 will not communicate and consequently the sub bus and its respective ECUs or sensors monitored by the gateway function equipped ECU (sub bus monitoring ECU) will not be displayed, indicating that the gateway function equipped ECU is not communicating with the central gateway ECU (network gateway ECU).
The malfunctioning part can be determined by inspecting for an open in the main bus line, a short between bus lines or a short to +B or ground.
Make sure to perform the inspection to measure resistances of buses to determine the cause of the malfunction.

Problem Symptom Pattern B

Display on Communication Bus Check Screen	ECUs or sensors farther from the central gateway ECU (network gateway ECU) than the open in the wires are displayed as not communicating on the "Communication Bus Check" screen.
Details of Malfunction	Open in both wires of the main bus line between CGW and No. 1 CAN junction connector in Bus 2

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*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction (open in both wires of the main bus line)	*f	Background color is red

HINT:

Due to the malfunction, almost all of the ECUs and sensors connected to Bus 2 will be displayed as not communicating and their background color will be red.
The malfunction in Bus 2 will not affect the other buses.
The malfunctioning part can be determined by inspecting for an open in the main bus line.
Make sure to perform the inspection to measure resistances of buses to determine the cause of the malfunction.

Display on Communication Bus Check Screen	ECUs or sensors farther from the central gateway ECU (network gateway ECU) than the open in the wires are displayed as not communicating on the "Communication Bus Check" screen.
Details of Malfunction	Open in both wires of the main bus line between the No. 1 CAN junction connector and No. 2 CAN junction connector in Bus 2

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*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction (open in both wires of the main bus line)	*f	Background color is red

HINT:

Due to the malfunction, ECUs or sensors farther from CGW than the open in the wires will be displayed as not communicating and their background color will be red.
The malfunction in Bus 2 will not affect the other buses.
The malfunctioning part can be determined by inspecting for an open in the main bus line.
Make sure to perform the inspection to measure resistances of buses to determine the cause of the malfunction.

Display on Communication Bus Check Screen	ECUs or sensors farther from the central gateway ECU (network gateway ECU) than the open in the wires are displayed as not communicating on the "Communication Bus Check" screen.
Details of Malfunction	Open in both wires of the main bus line between the No. 2 CAN junction connector and ENG in Bus 2

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*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction (open in both wires of the main bus line)	*f	Background color is red
*g	Pattern 1	*h	Pattern 2

HINT:

Even when the same part of the main bus line is open, depending on internal electrical noise which changes according to the position of the open in the line, the information displayed on the "Communication Bus Check" screen may differ.
In pattern 2, the information displayed may be the same as when there is an open in both wires in the main bus line between the No. 1 CAN junction connector and No. 2 CAN junction connector, which may make it difficult to determine the malfunctioning part.
The malfunction in Bus 2 will not affect the other buses.
Make sure to perform the inspection to measure resistances of buses to determine the cause of the malfunction.

Problem Symptom Pattern C

Display on Communication Bus Check Screen	One ECU or sensor is displayed as not communicating on the "Communication Bus Check" screen.
Details of Malfunction	Open in both wires of the branch line connected to F-MGC in Bus 2 Internal malfunction of F-MGC in Bus 2 Malfunction in the power supplied to F-MGC in Bus 2

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*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction 1 (open in both wires of the branch line)	*f	Background color is red
*g	Location of malfunction 2 Internal malfunction Power source malfunction	-	-

HINT:

The information displayed on the "Communication Bus Check" screen will be the same for an open in both wires of a branch line, an internal malfunction of an ECU or sensor or a malfunction in the power supplied to an ECU or sensor. In this example, the background color of the malfunctioning ECU or sensor will be red.

Display on Communication Bus Check Screen	One ECU or sensor is displayed as not communicating on the "Communication Bus Check" screen.
Details of Malfunction	Open in both wires of the branch line connected to ENG in Bus 4

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*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction (open in both wires of the branch line)	*f	Background color is red

HINT:

The malfunction in Bus 4 will not affect the other buses.
Due to the malfunction, although ENG is communicating normally with CGW via Bus 2, it is not communicating with CGW via Bus 4. Consequently, it will be displayed as not communicating in Bus 4.

Problem Symptom Pattern D

Display on Communication Bus Check Screen	No ECUs or sensors are displayed on the "Communication Bus Check" screen. All ECUs or sensors are displayed as not communicating on the "Communication Bus Check" screen.
Details of Malfunction	Internal malfunction of CGW Malfunction in the power supplied to CGW Open in both wires of the branch lines in the diagnosis bus

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*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction 1 (open in both wires of the branch line)	*f	Not displayed
*g	Location of malfunction 2 (Internal malfunction)	*h	Background color is red
*i	Pattern 1 (Malfunction occurred before CAN bus check)	*j	Pattern 2 (Malfunction occurred after CAN bus check)

HINT:

When there is no communication between the GTS and the vehicle, no ECUs or sensors will be displayed.

Problem Symptom Pattern E

Display on Communication Bus Check Screen	One ECU or sensor is displayed as not communicating in multiple buses on the "Communication Bus Check" screen.
Details of Malfunction	Internal malfunction of BRK Malfunction in the power supplied to BRK

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*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction Internal malfunction Power source malfunction	*f	Background color is red

HINT:

The information displayed on the "Communication Bus Check" screen will be the same for an internal malfunction of an ECU or sensor, or a malfunction in the power supplied to an ECU or sensor.

Due to the malfunction, BRK is not communicating with CGW via both Bus 2 and Bus 4. Consequently, the background color of BRK will be red for both Bus 2 and Bus 4.

Problem Symptom Pattern F

Display on Communication Bus Check Screen	Some ECUs or sensors are displayed as not communicating in the central bus and other ECUs or sensors are displayed as not communicating in a sub bus.
Details of Malfunction	Open in a wire of the branch line connected to HV in Bus 4 Internal malfunction of HV in Bus 4

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*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction 1 (open in a wire of the branch line)	*f	Location of malfunction 2 Internal malfunction Power source malfunction
*g	Background color is red	*h	Background color intermittently becomes yellow or red
*i	Not displayed or background color is yellow or red	-	-

HINT:

In the "Communication Bus Check" screen shown in the illustration, electrical noise in the CAN bus caused by an open in a wire in the branch line connected to HV interferes with the communication of MB causing unstable communication. Also, since MB is a gateway function equipped ECU, communication of ECUs connected to its respective sub bus will also be unstable.
In the "Communication Bus Check" screen shown in the illustration, because the background color of HV is red, it is suspected that HV is the most likely cause of the malfunction. Therefore, it is suspected that HV is not communicating.

Problem Symptom Pattern G

Display on Communication Bus Check Screen	A gateway function equipped ECU is displayed as not communicating in the central bus and ECUs and sensors connected to its respective sub bus are not displayed.
Details of Malfunction	Open in both wires of the branch line connected to MB in Bus 4 Internal malfunction of MB in Bus 4 Malfunction in the power supplied to MB in Bus 4

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*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction 1 (open in both wires of the branch line)	*f	Location of malfunction 2 Internal malfunction Power source malfunction
*g	Background color is red	*h	Not displayed

HINT:

If there is a communication malfunction in a gateway function equipped ECU, ECUs connected to its respective sub bus will also be affected and will not be displayed.
In the "Communication Bus Check" screen shown in the illustration, MB is a gateway function equipped ECU. Therefore, MB is suspected as not communicating.

Problem Symptoms Pattern H

Display on Communication Bus Check Screen	One ECU or sensor is displayed as not communicating in a sub bus on the "Communication Bus Check" screen.
Details of Malfunction	Internal malfunction of MIR-L in the sub bus Malfunction in the power supplied to MIR-L in the sub bus Open in both wires of the branch line connected to MIR-L in the sub bus

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*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction 1 (open in both wires of the branch line)	*f	Location of malfunction 2 Internal malfunction Power source malfunction
*g	Background color is red	-	-

HINT:

The malfunction in the sub bus will not affect the other buses.
When a gateway function equipped ECU memorizes ECUs and sensors connected to its respective sub bus and there is a communication malfunction in one of the ECUs or sensors, the background color of the ECU or sensor will change to red and the ECU or sensor will remain displayed.
The information displayed on the "Communication Bus Check" screen will be the same for an open in both wires of a branch line, an internal malfunction of an ECU or sensor or a malfunction in the power supplied to an ECU or sensor.

Problem Symptom Pattern I

Display on Communication Bus Check Screen	ECUs or sensors farther from the sub bus monitoring ECU (gateway function equipped ECU) than the open in the wires are displayed as not communicating on the "Communication Bus Check" screen.
Details of Malfunction	Open in both wires of the main bus line in the sub bus

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*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction (open in both wires of the main bus line)	*f	Background color is red

HINT:

Due to the malfunction, ECUs or sensors farther from the sub bus monitoring ECU (gateway function equipped ECU) than the open in the wires will be displayed as not communicating and their background color will be red.

How to Use "Communication Bus Check (Detail)" Screen in Inspection

Even if the malfunction cannot be determined on the "Communication Bus Check" screen, determine the malfunctioning part using Communication Bus Check (Detail) as follows:
NOTE:
- The following CAN bus wiring diagram or communication bus check screen is provided only as an example. This wiring diagram or screen differs from the actual one for this vehicle.
- The Lost Communication Time column displays the longest period of time in seconds that the central gateway ECU (network gateway ECU) detected a communication stop in the respective ECU or sensor.
- The Lost Communication Trip column displays the trip in which the central gateway ECU (network gateway ECU) detected the longest communication stop in the respective ECU or sensor.
- When using the combo box, it may be possible to select a sub bus from the drop down list that does not have any connected ECUs or sensors. This is not a malfunction and occurs when there is no optional device connected to a sub bus which is monitored by a sub bus monitoring ECU (gateway function equipped ECU).
- In the drop down list, all sub buses applicable to the model are displayed (e.g. LIN communication sub buses are also displayed). For information on sub buses necessary to diagnose CAN communication system, refer to the System Diagram.
  Refer to SYSTEM DIAGRAM [11/2023 - ]
HINT:
- If the CAN communication system is currently malfunctioning, it is recommended to use Communication Bus Check rather than Communication Bus Check (Detail) for determining the suspected area.
- The communication error history of ECUs or sensors which have communication error history can be displayed on the "Communication Bus Check (Detail)" screen.
- Lost Communication Time and Lost Communication Trip are only displayed for the central bus.
- Lost Communication Time and Lost Communication Trip are not displayed for sub buses.

If there is an ECU or sensor displayed with a red background on the "Communication Bus Check (Detail)" screen to indicate that it was not communicating, it is suspected that the ECU or sensor was not communicating.

Details of Malfunction

Past malfunction in the wire harness or power supplied to F-MGC in Bus 2

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*a	Bus 2	*b	Bus 4
*c	Sub bus	*d	Diagnosis bus
*e	Location of malfunction Internal malfunction Power source malfunction	*f	Background color is red

DESCRIPTION OF "COMMUNICATION BUS CHECK (DETAIL)" SCREEN

Bus Type	Background Color	Connection Status
Bus	White	Either of the following: Communication has been normal. Lost Communication Time is below 6 seconds.
	Red	Lost Communication Time is 6 seconds or more.
	Not displayed	Either of the following: The central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS.1 No ECUs or sensors are connected to the bus.2
Sub bus	White	Lost Communication Time is displayed as "-".
Sub bus	Not displayed	Either of the following: The gateway function equipped ECU cannot communicate with the central gateway ECU.3 No ECUs or sensors are connected to the sub bus.4

HINT:

Check the values of Lost Communication Trip and Current Trip for the ECUs or sensors that have a red background color.
If the values of Lost Communication Trip and Current Trip are the same for an ECU or sensor, the ECU or sensor is currently not communicating. In this case, it is recommended to use Communication Bus Check rather than Communication Bus Check (Detail) for determining the suspected area.
In the "Communication Bus Check (Detail)" screen shown in the illustration, F-MGC had a communication malfunction in the 10th trip. Thus, it is suspected that F-MGC was not communicating.
*1: When the central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS, the name of buses, sub buses, ECUs and sensors will not be displayed.
*2: When no ECUs or sensors are connected to a bus, the message "There is no system found on the communication Bus." will be displayed.
*3: When a gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU), the name of sub buses and ECUs or sensors connected to the sub bus will not be displayed.
*4: When no ECUs or sensors are connected to the sub bus, the message "There is no system found on the communication Bus." will be displayed.

DTC TABLE BY ECU

HINT:

In the CAN communication system, the CAN communication DTCs of each ECU can be displayed using the GTS.
If CAN communication system DTCs are output, the malfunction cannot be determined only by the DTCs. Perform troubleshooting according to How to Proceed with Troubleshooting.
Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2023 - ]
If there is a malfunction currently, DTCs can be checked by performing steps in the DTC check procedure.

ECM / GTS Display "Engine"

Powertrain > Engine > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.
*: Refer to SFI System.
Refer to DTC U0101-87: Lost Communication with TCM Missing Message [10/2022 - ]

DTC	Detection Item	DTC Detection Condition
U0101-87*	Lost Communication with TCM Missing Message	Communication stops between the ECM and the TCM.
U0120-87	Lost Communication with Starter / Generator Control Module Missing Message	Communication stops between the ECM and the engine stop and start ECU.
U0129-87	Lost Communication with Brake System Control Module Missing Message	Communication stops between the ECM and the brake actuator assembly.
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the ECM and the combination meter assembly.

ECM / GTS Display "Transmission"

Powertrain > Transmission > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.
*: Refer to Automatic Transaxle System.
Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ]

DTC	Detection Item	DTC Detection Condition
U0100-87*	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the TCM and the ECM.
U0120-87	Lost Communication with Starter / Generator Control Module Missing Message	Communication stops between the ECM and the engine stop and start ECU.
U0129-87	Lost Communication with Brake System Control Module Missing Message	Communication stops between the ECM and the brake actuator assembly.

Brake Actuator Assembly / GTS Display "Brake/EPB"

Chassis > Brake/EPB > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0074-88	Control Module Communication Bus "B" Off Bus Off	Bus off is judged.
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the brake actuator assembly and the ECM.
U0101-87	Lost Communication with TCM Missing Message	Communication stops between the brake actuator assembly and the ECM.
U0125-87	Lost Communication with Multi-axis Acceleration Sensor Module Missing Message	Communication stops between the brake actuator assembly and the airbag sensor assembly.
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	Communication stops between the brake actuator assembly and the steering sensor.
U0151-87	Lost Communication with Restraints Control Module Missing Message	Communication stops between the brake actuator assembly and the airbag sensor assembly.

Rack and Pinion Power Steering Gear Assembly / GTS Display "EMPS"

Chassis > EMPS > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the rack and pinion power steering gear assembly and the ECM.
U0129-87	Lost Communication With Brake System Control Module Missing Message	Communication stops between the rack and pinion power steering gear assembly and the brake actuator assembly.
U023A-87	Lost Communication with Image Processing Module "A" Missing Message	Communication stops between the rack and pinion power steering gear assembly and the forward recognition camera.

Main Body ECU (Multiplex Network Body ECU) / GTS Display "Main Body"

Body Electrical > Main Body > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the ECM.
U0101-87	Lost Communication with TCM Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the ECM.
U0120-87	Lost Communication with Starter / Generator Control Module Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the engine stop and start ECU.
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the steering sensor.
U0129-87	Lost Communication with Brake System Control Module "A" Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the brake actuator assembly.
U0151-87	Lost Communication with Restraints Control Module Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the airbag sensor assembly.
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the combination meter assembly.
U0163-87	Lost Communication with Navigation Control Module Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the radio and display receiver assembly.
U0164-87	Lost Communication with HVAC Control Module Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the air conditioning amplifier assembly.
U0168-87	Lost Communication with Vehicle Security Control Module Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the certification ECU (smart key ECU assembly).
U0199-87	Lost Communication with "Door Control Module A" Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the outer mirror control ECU assembly RH.
U0200-87	Lost Communication with "Door Control Module B" Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the outer mirror control ECU assembly LH.
U0208-87	Lost Communication with "Seat Control Module A" Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the position control ECU assembly LH.
U0230-87	Lost Communication with Rear Gate Module Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the multiplex network door ECU.
U023A-87	Lost Communication with Image Processing Module "A" Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the forward recognition camera.
U0241-87	Lost Communication with Headlamp Control Module "A" Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the headlight ECU sub-assembly LH.
U1106-87	Lost Communication with Electric Parking Brake Module Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the brake actuator assembly.
U1117-87	Lost Communication with Accessory Gateway Missing Message	Communication stops between the main body ECU (multiplex network body ECU) and the option connector (bus buffer ECU).

Combination Meter Assembly / GTS Display "Combination Meter"

Body Electrical > Combination Meter > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the combination meter assembly and the ECM.
U0114-87	Lost Communication with Four-Wheel Drive Clutch Control Module Missing Message	Communication stops between the combination meter assembly and the 4WD ECU assembly.
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	Communication stops between the combination meter assembly and the steering sensor.
U0129-87	Lost Communication with Brake System Control Module Missing Message	Communication stops between the combination meter assembly and the brake actuator assembly.
U0131-87	Lost Communication with Power Steering Control Module Missing Message	Communication stops between the combination meter assembly and the rack and pinion power steering gear assembly.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the combination meter assembly and the main body ECU (multiplex network body ECU).
U0151-87	Lost Communication with Restraints Control Module Missing Message	Communication stops between the combination meter assembly and the airbag sensor assembly.
U0163-87	Lost Communication with Navigation Control Module Missing Message	Communication stops between the combination meter assembly and the radio receiver assembly or radio and display receiver assembly.
U0164-87	Lost Communication with HVAC Control Module Missing Message	Communication stops between the combination meter assembly and the air conditioning amplifier assembly.
U0168-87	Lost Communication with Vehicle Security Control Module Missing Message	Communication stops between the combination meter assembly and the certification ECU (smart key ECU assembly).
U0182-87	Lost Communication with Lighting Control Module Front Missing Message	Communication stops between the combination meter assembly and the headlight ECU sub-assembly LH.
U0230-87	Lost Communication with Rear Gate Module Missing Message	Communication stops between the combination meter assembly and the multiplex network door ECU.
U0233-87	Lost Communication with Side Obstacle Detection Control Module "B" Missing Message	Communication stops between the combination meter assembly and the blind spot monitor sensor LH (B).
U023A-87	Lost Communication with Image Processing Module "A" Missing Message	Communication stops between the combination meter assembly and the forward recognition camera.
U1103-87	Lost Communication with Stop and Start Control Module Missing Message	Communication stops between the combination meter assembly and the engine stop and start ECU.
U1110-87	Lost Communication with Intuitive Parking Assist Module Missing Message	Communication stops between the combination meter assembly and the clearance warning ECU assembly.
U1112-87	Lost Communication with Combination Switch Module Missing Message	Communication stops between the combination meter assembly and the steering sensor.
U1133-87	Lost Communication with PMN Module Missing Message	Communication stops between the combination meter assembly and the certification ECU (smart key ECU assembly).

Certification ECU (Smart Key ECU Assembly) / GTS Display "Smart Access"

Body Electrical > Smart Key > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the ECM for approximately 10 seconds or more.
U0129-87	Lost Communication with Brake System Control Module "A" Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the brake actuator assembly for approximately 10 seconds or more.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the main body ECU (multiplex network body ECU) for approximately 10 seconds or more.
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the combination meter assembly for approximately 10 seconds or more.
U0163-87	Lost Communication with Navigation Control Module Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the radio and display receiver assembly.
U0230-87	Lost Communication with Rear Gate Module Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the multiplex network door ECU for approximately 10 seconds or more.
U1103-87	Lost Communication with Stop and Start Control Module Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the engine stop and start ECU for approximately 10 seconds or more.
U1110-87	Lost Communication with Intuitive Parking Assist Module Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the clearance warning ECU assembly.
U1117-87	Lost Communication with Accessory Gateway Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the option connector (bus buffer ECU) for approximately 10 seconds or more.

Certification ECU (Smart Key ECU Assembly) / GTS Display "Power Source Control"

Body Electrical > Power Source Control > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the ECM for approximately 4 seconds or more.
U0129-87	Lost Communication with Brake System Control Module "A" Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the brake actuator assembly for approximately 4 seconds or more.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the main body ECU (multiplex network body ECU) for approximately 3 seconds or more.
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the combination meter assembly for approximately 5 seconds or more.
U0163-87	Lost Communication with Navigation Control Module Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the radio and display receiver assembly.
U0230-87	Lost Communication with Rear Gate Module Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the multiplex network door ECU.
U1110-87	Lost Communication with Intuitive Parking Assist Module Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the clearance warning ECU assembly.
U1117-87	Lost Communication with Accessory Gateway Missing Message	Communication stops between the certification ECU (smart key ECU assembly) and the option connector (bus buffer ECU) for approximately 5 seconds or more.

Air Conditioning Amplifier Assembly / GTS Display "Air Conditioner"

Body Electrical > Air Conditioner > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the air conditioning amplifier assembly and the ECM.
U0131-87	Lost Communication with Power Steering Control Module Missing Message	Communication stops between the air conditioning amplifier assembly and the rack and pinion power steering gear assembly.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the air conditioning amplifier assembly and the main body ECU (multiplex network body ECU).
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the air conditioning amplifier assembly and the combination meter assembly.
U0163-87	Lost Communication with Navigation Control Module Missing Message	Communication stops between the air conditioning amplifier assembly and the radio and display receiver assembly.
U0198-87	Lost Communication with Telematic Control Module "A" Missing Message	Communication stops between the air conditioning amplifier assembly and the DCM (telematics transceiver).
U1103-87	Lost Communication with Stop and Start Control Module Missing Message	Communication stops between the air conditioning amplifier assembly and the engine stop and start ECU.

Millimeter Wave Radar Sensor Assembly / GTS Display "Front Radar Sensor"

Body Electrical > Front Radar Sensor > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.
*: Refer to Front Radar Sensor System.
Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ]

DTC	Detection Item	DTC Detection Condition
U0104-87*	Lost Communication with Cruise Control Module Missing Message	Communication stops between the forward recognition camera and the millimeter wave radar sensor assembly.
U0305-57*	Software Incompatibility with Cruise Control Module Invalid / Incompatible Software Component	The control system information sent from the forward recognition camera does not match that stored in the millimeter wave radar sensor assembly.

Blind Spot Monitor Sensor LH (B) / GTS Display "Blind Spot Monitor "B""

Body Electrical > Blind Spot Monitor "B" > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.
*: Refer to Blind Spot Monitor System.
Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ]

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the blind spot monitor sensor LH (B) and the ECM.
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	Communication stops between the blind spot monitor sensor LH (B) and the steering sensor.
U0129-87	Lost Communication with Brake System Control Module "A" Missing Message	Communication stops between the blind spot monitor sensor LH (B) and the brake actuator assembly.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the blind spot monitor sensor LH (B) and the main body ECU (multiplex network body ECU).
U0232-87*	Lost Communication with Side Obstacle Detection Control Module "A" Missing Message	Communication stops between the blind spot monitor sensor LH (B) and the blind spot monitor sensor RH (A) for approximately 11 seconds or more.
U0322-51*	Software Incompatibility with Body Control Module Not Programmed	Destination information of the main body ECU (multiplex network body ECU) and blind spot monitor sensor LH (B) do not match.
U0322-57*	Software Incompatibility with Body Control Module Invalid / Incompatible Software Component	Destination information of the main body ECU (multiplex network body ECU) and blind spot monitor sensor LH (B) do not match.
U1110-87	Lost Communication with Clearance Sonar Module Missing Message	Communication stops between the blind spot monitor sensor LH (B) and the clearance warning ECU assembly.

Blind Spot Monitor Sensor RH (A) / GTS Display "Blind Spot Monitor "A""

Body Electrical > Blind Spot Monitor "A" > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.
*: Refer to Blind Spot Monitor System.
Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ]

DTC	Detection Item	DTC Detection Condition
U0233-87*	Lost Communication with Side Obstacle Detection Control Module "B" Missing Message	Communication stops between the blind spot monitor sensor RH (A) and the blind spot monitor sensor LH (B).
U0322-51*	Software Incompatibility with Body Control Module Not Programmed	Destination information of the main body ECU (multiplex network body ECU) and blind spot monitor sensor RH (A) do not match.
U0322-57*	Software Incompatibility with Body Control Module Invalid/Incompatible Software Component	Destination information of the main body ECU (multiplex network body ECU) and blind spot monitor sensor RH (A) do not match.

Clearance Warning ECU Assembly / GTS Display "Clearance Warning"

Body Electrical > Clearance Warning > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.
*: Refer to Intuitive Parking Assist System.
Refer to DTC U1177-87: Lost Communication with Side Obstacle Detection Control Module "A" (ch2) Missing Message; DTC U1178-87: Lost Communication with Side Obstacle Detection Control Module "B" (ch2) Missing Message [11/2023 - ]

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the clearance warning ECU assembly and the ECM.
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	Communication stops between the clearance warning ECU assembly and the steering sensor.
U0129-87	Lost Communication with Brake System Control Module Missing Message	Communication stops between the clearance warning ECU assembly and the brake actuator assembly for approximately 1 second or more.
U0131-87	Lost Communication with Power Steering Control Module Missing Message	Communication stops between the clearance warning ECU assembly and the rack and pinion power steering gear assembly.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the clearance warning ECU assembly and the main body ECU (multiplex network body ECU).
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the clearance warning ECU assembly and the combination meter assembly.
U0163-87	Lost Communication with Navigation Control Module Missing Message	Communication stops between the clearance warning ECU assembly and the radio and display receiver assembly.
U0164-87	Lost Communication with HVAC Control Module Missing Message	Communication stops between the clearance warning ECU assembly and the air conditioning amplifier assembly.
U0233-87	Lost Communication with Side Obstacle Detection Control Module "B" Missing Message	Communication stops between the clearance warning ECU assembly and the blind spot monitor sensor LH (B).
U023B-87	Lost Communication with Image Processing Module "B" Missing Message	Communication stops between the clearance warning ECU assembly and the parking assist ECU.
U0265-87	Lost Communication with Image Processing Sensor A Missing Message	Communication stops between the clearance warning ECU assembly and the rear television camera assembly.
U1103-87	Lost Communication with Stop and Start Control Module Missing Message	Communication stops between the clearance warning ECU assembly and the engine stop and start ECU.
U1106-87	Lost Communication with Electric Parking Brake Module Missing Message	Communication stops between the clearance warning ECU assembly and the brake actuator assembly.
U1177-87*	Lost Communication with Side Obstacle Detection Control Module "A" (ch2) Missing Message	Communication stops between the clearance warning ECU assembly and the blind spot monitor sensor RH (A).
U1178-87*	Lost Communication with Side Obstacle Detection Control Module "B" (ch2) Missing Message	Communication stops between the clearance warning ECU assembly and the blind spot monitor sensor LH (B).

DCM (Telematics Transceiver) / GTS Display "Telematics"

Body Electrical > Telematics > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the DCM (telematics transceiver) and the main body ECU (multiplex network body ECU).
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the DCM (telematics transceiver) and the combination meter assembly.
U0163-87	Lost Communication with Navigation Control Module Missing Message	Communication stops between the DCM (telematics transceiver) and the radio and display receiver assembly.

Radio and Display Receiver Assembly / GTS Display "Navigation System"

Body Electrical > Navigation System > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.
*: Refer to Audio and Visual System.
Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - 11/2024] , or refer to DIAGNOSTIC TROUBLE CODE CHART [11/2024 - ]

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the radio and display receiver assembly and the ECM.
U0129-87	Lost Communication with Brake System Control Module "A" Missing Message	Communication stops between the radio and display receiver assembly and the brake actuator assembly.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the radio and display receiver assembly and the main body ECU (multiplex network body ECU).
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the radio and display receiver assembly and the combination meter assembly.
U0164-87	Lost Communication with HVAC Control Module Missing Message	Communication stops between the radio and display receiver assembly and the air conditioning amplifier assembly.
U0168-87	Lost Communication with Vehicle Security Control Module Missing Message	Communication stops between the radio and display receiver assembly and the certification ECU (smart key ECU assembly).
U0198-87	Lost Communication with Telematic Control Module "A" Missing Message	Communication stops between the radio and display receiver assembly and the DCM (telematics transceiver).
U023B-87	Lost Communication with Image Processing Module "B" Missing Message	Communication stops between the radio and display receiver assembly and the parking assist ECU.
U0265-87	Lost Communication with Image Processing Sensor A Missing Message	Communication stops between the radio and display receiver assembly and the rear television camera assembly.
U1000-49	CAN Register Fixing Internal Electronic Failure	CAN communication malfunction (message register).
U1110-87	Lost Communication with Intuitive Parking Assist Module Missing Message	Communication stops between the radio and display receiver assembly and the clearance warning ECU assembly.
U11D0-87*	Lost Local Communication with MET Missing Message	Communication stops between the radio and display receiver assembly and the combination meter assembly.
U11D1-87*	Lost Local Communication with HUD Missing Message	Communication malfunction between radio and display receiver assembly and meter mirror sub-assembly.

4WD ECU Assembly / GTS Display "Four Wheel Drive"

Chassis > Four Wheel Drive > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the 4WD ECU assembly and the ECM.
U0125-87	Lost Communication with Multi-Axis Acceleration Sensor Module Missing Message	Communication stops between the 4WD ECU assembly and the airbag sensor assembly.
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	Communication stops between the 4WD ECU assembly and the steering sensor.
U0129-87	Lost Communication with Brake System Control Module Missing Message	Communication stops between the 4WD ECU assembly and the brake actuator assembly.
U0131-87	Lost Communication with Power Steering Control Module Missing Message	Communication stops between the 4WD ECU assembly and the rack and pinion power steering gear assembly.

Parking Assist ECU / GTS Display "Circumference Monitoring Camera Control Module"

Chassis > Circumference Monitoring Camera Control Module > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the parking assist ECU and the ECM.
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	Communication stops between the parking assist ECU and the steering sensor.
U0129-87	Lost Communication with Brake System Control Module "A" Missing Message	Communication stops between the parking assist ECU and the brake actuator assembly.
U0131-87	Lost Communication with Power Steering Control Module Missing Message	Communication stops between the parking assist ECU and the rack and pinion power steering gear assembly.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the parking assist ECU and the main body ECU (multiplex network body ECU).
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the parking assist ECU and the combination meter assembly.
U0163-87	Lost Communication with Navigation Control Module Missing Message	Communication stops between the parking assist ECU and the radio and display receiver assembly.
U0198-87	Lost Communication with Telematic Control Module "A" Missing Message	Communication stops between the parking assist ECU and the DCM (telematics transceiver).
U1110-87	Lost Communication with Intuitive Parking Assist Module Missing Message	Communication stops between the parking assist ECU and the clearance warning ECU assembly.
U114F-87	Lost Communication with Power Integration Module Missing Message	Communication stops between the parking assist ECU and the main body ECU (multiplex network body ECU).

Multiplex Network Door ECU / GTS Display "Back Door"

Body Electrical > Back Door > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0101-87	Lost Communication with TCM Missing Message	Communication stops between the multiplex network door ECU and the ECM.
U0129-87	Lost Communication with Brake System Control Module "A" Missing Message	Communication stops between the multiplex network door ECU and the brake actuator assembly.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the multiplex network door ECU and the main body ECU (multiplex network body ECU).
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the multiplex network door ECU and the combination meter assembly.
U0168-87	Lost Communication with Vehicle Security Control Module Missing Message	Communication stops between the multiplex network door ECU and the certification ECU (smart key ECU assembly).
U1117-87	Lost Communication with Accessory Gateway Missing Message	Communication stops between the multiplex network door ECU and the option connector (bus buffer ECU).
U114F-87	Lost Communication with Power Integration Module Missing Message	Communication stops between the multiplex network door ECU and the main body ECU (multiplex network body ECU).

Engine Stop and Start ECU / GTS Display "Stop and Start"

Powertrain > Stop and Start > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the engine stop and start ECU and the ECM.
U0101-87	Lost Communication with TCM Missing Message	Communication stops between the engine stop and start ECU and the ECM.
U0129-87	Lost Communication with Brake System Control Module Missing Message	Communication stops between the engine stop and start ECU and the brake actuator assembly.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the engine stop and start ECU and the main body ECU (multiplex network body ECU).
U0151-87	Lost Communication with Restraints Control Module Missing Message	Communication stops between the engine stop and start ECU and the airbag sensor assembly.
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the engine stop and start ECU and the combination meter assembly.
U0164-87	Lost Communication with HVAC Control Module Missing Message	Communication stops between the engine stop and start ECU and the air conditioning amplifier assembly.
U115C-87	Lost Communication with ECM/PCM "A" (ch5) Missing Message	Communication stops between the engine stop and start ECU and the brake actuator assembly.
U1170-87	Lost Communication with Brake System Control Module (ch2) Missing	Communication stops between the engine stop and start ECU and the brake actuator assembly.

Headlight ECU Sub-assembly LH / GTS Display "Headlight Control"

Body Electrical > Headlight Control > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.
*: Refer to Lighting System (w/ AFS).
Refer to DTC U1000-49: CAN Register Fixing Internal Electronic Failure [11/2023 - ]

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the headlight ECU sub-assembly LH and the ECM.
U0101-87	Lost Communication with TCM Missing Message	Communication stops between the headlight ECU sub-assembly LH and the ECM.
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	Communication stops between the headlight ECU sub-assembly LH and the steering sensor.
U0129-87	Lost Communication with Brake System Control Module "A" Missing Message	Communication stops between the headlight ECU sub-assembly LH and the brake actuator assembly.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the headlight ECU sub-assembly LH and the main body ECU (multiplex network body ECU).
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the headlight ECU sub-assembly LH and the combination meter assembly.
U0242-87	Lost Communication with Headlamp Control Module "B" Missing Message	Communication stops between the headlight ECU sub-assembly LH and the headlight ECU sub-assembly RH.
U1000-49*	CAN Register Fixing Internal Electronic Failure	CAN communication malfunction (message register).
U114F-87	Lost Communication with Power Integration Module Missing Message	Communication stops between the headlight ECU sub-assembly LH and the main body ECU (multiplex network body ECU).

Headlight ECU Sub-assembly RH / GTS Display "Headlight Control (Sub)"

Body Electrical > Headlight Control (Sub) > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.
*: Refer to Lighting System (w/ AFS).
Refer to DTC U1000-49: CAN Register Fixing Internal Electronic Failure [11/2023 - ]

DTC	Detection Item	DTC Detection Condition
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	Communication stops between the headlight ECU sub-assembly RH and the steering sensor.
U0129-87	Lost Communication with Brake System Control Module "A" Missing Message	Communication stops between the headlight ECU sub-assembly RH and the brake actuator assembly.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the headlight ECU sub-assembly RH and the main body ECU (multiplex network body ECU).
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the headlight ECU sub-assembly RH and the combination meter assembly.
U0241-87	Lost Communication with Headlamp Control Module "A" Missing Message	Communication stops between the headlight ECU sub-assembly RH and the headlight ECU sub-assembly LH.
U1000-49*	CAN Register Fixing Internal Electronic Failure	CAN communication malfunction (message register).
U114F-87	Lost Communication with Power Integration Module Missing Message	Communication stops between the headlight ECU sub-assembly RH and the main body ECU (multiplex network body ECU).

Airbag Sensor Assembly / GTS Display "SRS Airbag"

Body Electrical > SRS Airbag > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0129-87	Lost Communication with Brake System Control Module "A" Missing Message	Communication stops between the airbag sensor assembly and the brake actuator assembly.
U0235-87	Lost Communication with Cruise Control Front Distance Range Sensor Single Sensor or Center Missing Message	Communication stops between the airbag sensor assembly and the forward recognition camera.

Tire Pressure Warning ECU and Receiver / GTS Display "Tire Pressure Monitor"

Chassis > Tire Pressure Monitor > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0129-87	Lost Communication with Brake System Control Module "A" Missing Message	Communication stops between the tire pressure warning ECU and receiver and the brake actuator assembly.

Outer Mirror Control ECU Assembly RH / GTS Display "Mirror R"

Body Electrical > Mirror R > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the outer mirror control ECU assembly RH and the ECM.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the outer mirror control ECU assembly RH and the main body ECU (multiplex network body ECU).
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the outer mirror control ECU assembly RH and the combination meter assembly.
U0164-87	Lost Communication with HVAC Control Module Missing Message	Communication stops between the outer mirror control ECU assembly RH and the air conditioning amplifier assembly.
U114F-87	Lost Communication with Power Integration Module Missing Message	Communication stops between the outer mirror control ECU assembly RH and the main body ECU (multiplex network body ECU).

Outer Mirror Control ECU Assembly LH / GTS Display "Mirror L"

Body Electrical > Mirror L > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the outer mirror control ECU assembly LH and the ECM.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the outer mirror control ECU assembly LH and the main body ECU (multiplex network body ECU).
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the outer mirror control ECU assembly LH and the combination meter assembly.
U0164-87	Lost Communication with HVAC Control Module Missing Message	Communication stops between the outer mirror control ECU assembly LH and the air conditioning amplifier assembly.
U114F-87	Lost Communication with Power Integration Module Missing Message	Communication stops between the outer mirror control ECU assembly LH and the main body ECU (multiplex network body ECU).

Rear Television Camera Assembly / GTS Display "Rear Camera"

Chassis > Rear Camera > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the rear television camera assembly and the ECM.
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	Communication stops between the rear television camera assembly and the steering sensor.
U0129-87	Lost Communication with Brake System Control Module "A" Missing Message	Communication stops between the rear television camera assembly and the brake actuator assembly.
U0131-87	Lost Communication with Power Steering Control Module "A" Missing Message	Communication stops between the rear television camera assembly and the rack and pinion power steering gear assembly.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the rear television camera assembly and the main body ECU (multiplex network body ECU).
U0163-87	Lost Communication with Navigation Control Module Missing Message	Communication stops between the rear television camera assembly and the radio and display receiver assembly.
U1110-87	Lost Communication with Intuitive Parking Assist Module Missing Message	Communication stops between the rear television camera assembly and the clearance warning ECU assembly.
U114F-87	Lost Communication with Power Integration Module Missing Message	Communication stops between the rear television camera assembly and the main body ECU (multiplex network body ECU).

Inner Rear View Mirror Assembly / GTS Display "Digital Rear-View Mirror"

Body Electrical > Digital Rear-View Mirror > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0101-87	Lost Communication with TCM Missing Message	Communication stops between the inner rear view mirror assembly and the ECM.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the inner rear view mirror assembly and the main body ECU (multiplex network body ECU).

ECM / GTS Display "Radar Cruise 1"

Powertrain > Radar Cruise 1 > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the brake actuator assembly and the ECM.
U0104-87	Lost Communication with Cruise Control Module Missing Message	Communication stops between the ECM and the forward recognition camera.
U0122-87	Lost Communication with Vehicle Dynamics Control Module Missing Message	Communication stops between the ECM and the brake actuator assembly.

Forward Recognition Camera / GTS Display "Radar Cruise 2"

Powertrain > Radar Cruise 2 > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.
*: Refer to Dynamic Radar Cruise Control System.
Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ]

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the forward recognition camera and the ECM.
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	Communication stops between the forward recognition camera and the steering sensor.
U0129-87	Lost Communication with Brake System Control Module Missing Message	Communication stops between the forward recognition camera and the brake actuator assembly.
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the forward recognition camera and the combination meter assembly.
U0235-87*	Lost Communication with Cruise Control Front Distance Range Sensor Single Sensor or Center Missing Message	Communication stops between the forward recognition camera and the millimeter wave radar sensor assembly.
U0300-51*	Internal Control Module Software Incompatibility Not Programmed	The control system information sent from the ECM remains undefined by the forward recognition camera.
U0300-57*	Internal Control Module Software Incompatibility Invalid / Incompatible Software Component	The vehicle information sent from the ECM does not match that stored in the forward recognition camera.
U0322-51*	Software Incompatibility with Body Control Module Not Programmed	The vehicle information sent from the main body ECU (multiplex network body ECU) remains undefined by the forward recognition camera.
U0322-57*	Software Incompatibility with Body Control Module Invalid / Incompatible Software Component	The vehicle information sent from the main body ECU (multiplex network body ECU) does not match that stored in the forward recognition camera.
U0401-81	Invalid Data Received from ECM/PCM "A" Invalid Serial Data Received	The ECM does not receive data from the forward recognition camera.
U1106-87	Lost Communication with Electric Parking Brake Module Missing Message	Communication stops between the forward recognition camera and the brake actuator assembly.

Forward Recognition Camera / GTS Display "Pre-Collision System"

Body Electrical > Pre-Collision System > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.
*: Refer to Pre-Collision System.
Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ]

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the forward recognition camera and the ECM.
U0101-87	Lost Communication with TCM Missing Message	Communication stops between the forward recognition camera and the ECM.
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	Communication stops between the forward recognition camera and the steering sensor.
U0129-87	Lost Communication with Brake System Control Module Missing Message	Communication stops between the forward recognition camera and the brake actuator assembly.
U0131-87	Lost Communication with Power Steering Control Module Missing Message	Communication stops between the forward recognition camera and the rack and pinion power steering gear assembly.
U0235-87*	Lost Communication with Cruise Control Front Distance Range Sensor Single Sensor or Center Missing Message	Communication stops between the forward recognition camera and the millimeter wave radar sensor assembly.
U0300-51*	Internal Control Module Software Incompatibility Not Programmed	The control system information sent from the ECM remains undefined by the forward recognition camera.
U0300-57*	Internal Control Module Software Incompatibility Invalid / Incompatible Software Component	The control system information sent from the ECM does not match that stored in the forward recognition camera.
U0328-51*	Software Incompatibility with Steering Angle Sensor Module Not Programmed	The variable gear ratio steering system existing information from the steering sensor remains undefined by the forward recognition camera.
U0328-57*	Software Incompatibility with Steering Angle Sensor Module Invalid / Incompatible Software Component	The variable gear ratio steering system existing information from the steering sensor does not match that stored in the forward recognition camera.
U0418-81*	Invalid Data Received from Brake System Control Module Invalid Serial Data Received	The forward recognition camera receives an abnormal brake system control signal for 1 second or more.

Forward Recognition Camera / GTS Display "Front Recognition Camera"

Chassis > Front Recognition Camera > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.
*: Refer to Front Camera System.
Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ]

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the forward recognition camera and the ECM.
U0101-87	Lost Communication with TCM Missing Message	Communication stops between the forward recognition camera and the ECM.
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	Communication stops between the forward recognition camera and the steering sensor.
U0129-87	Lost Communication with Brake System Control Module Missing Message	Communication stops between the forward recognition camera and the brake actuator assembly.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the forward recognition camera and the main body ECU (multiplex network body ECU).
U0300-51*	Internal Control Module Software Incompatibility Not Programmed	The control system information sent from the ECM remains undefined by the forward recognition camera.
U0300-57*	Internal Control Module Software Incompatibility Invalid / Incompatible Software Component	The control system information sent from the ECM does not match that stored in the forward recognition camera.
U0322-51*	Software Incompatibility with Body Control Module Not Programmed	The vehicle information sent from the main body ECU (multiplex network body ECU) remains undefined by the forward recognition camera.
U0322-57*	Software Incompatibility with Body Control Module Invalid / Incompatible Software Component	The vehicle information sent from the main body ECU (multiplex network body ECU) does not match that stored in the forward recognition camera.

Forward Recognition Camera / GTS Display "Lane Control"

Chassis > Lane Control > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.
*: Refer to Lane Control System.
Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ]

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the forward recognition camera and the ECM.
U0101-87	Lost Communication with TCM Missing Message	Communication stops between the forward recognition camera and the ECM.
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	Communication stops between the forward recognition camera and the steering sensor.
U0129-87	Lost Communication with Brake System Control Module Missing Message	Communication stops between the forward recognition camera and the brake actuator assembly.
U0131-87	Lost Communication with Power Steering Control Module Missing Message	Communication stops between the forward recognition camera and the rack and pinion power steering gear assembly.
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the forward recognition camera and the combination meter assembly.
U0235-87*	Lost Communication with Cruise Control Front Distance Range Sensor Single Sensor or Center Missing Message	Communication stops between the forward recognition camera and the millimeter wave radar sensor assembly.
U0300-51*	Internal Control Module Software Incompatibility Not Programmed	The vehicle information sent from the ECM remains undefined by the forward recognition camera.
U0300-57*	Internal Control Module Software Incompatibility Invalid / Incompatible Software Component	The vehicle information sent from the ECM does not match that stored in the forward recognition camera.

Forward Recognition Camera / GTS Display "Road Sign Assist"

Body Electrical > Road Sign Assist > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the forward recognition camera and the ECM.
U0101-87	Lost Communication with TCM Missing Message	Communication stops between the forward recognition camera and the ECM.
U0126-87	Lost Communication with Steering Angle Sensor Module Missing Message	Communication stops between the forward recognition camera and the steering sensor.
U0129-87	Lost Communication with Brake System Control Module Missing Message	Communication stops between the forward recognition camera and the brake actuator assembly.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the forward recognition camera and the main body ECU (multiplex network body ECU).
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the forward recognition camera and the combination meter assembly.
U0163-87	Lost Communication With Navigation Control Module Missing Message	Communication stops between the forward recognition camera and the radio and display receiver assembly.

Forward Recognition Camera / GTS Display "Front Recognition Camera (Front Lighting Control)"

Body Electrical > Front Recognition Camera (Front Lighting Control) > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.
*: Refer to Lighting System.
Refer to DTC U0235-87: Lost Communication with Cruise Control Front Distance Range Sensor Signal Sensor or Center Missing Message [12/2019 - ]

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the forward recognition camera and the ECM.
U0125-87	Lost Communication with Multi-axis Acceleration Sensor Module Missing Message	Communication stops between the forward recognition camera and the airbag sensor assembly.
U0129-87	Lost Communication with Brake System Control Module Missing Message	Communication stops between the forward recognition camera and the brake actuator assembly.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the forward recognition camera and the main body ECU (multiplex network body ECU).
U0235-87*	Lost Communication with Cruise Control Front Distance Range Sensor Single Sensor or Center Missing Message	Communication stops between the forward recognition camera and the millimeter wave radar sensor assembly.

Meter Mirror Sub-assembly / GTS Display "Head Up Display"

Body Electrical > Head Up Display > Trouble Codes

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition
U0100-87	Lost Communication with ECM/PCM "A" Missing Message	Communication stops between the meter mirror sub-assembly and the ECM.
U0129-87	Lost Communication with Brake System Control Module Missing Message	Communication stops between the meter mirror sub-assembly and the brake actuator assembly.
U0140-87	Lost Communication with Body Control Module Missing Message	Communication stops between the meter mirror sub-assembly and the main body ECU (multiplex network body ECU).
U0155-87	Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message	Communication stops between the meter mirror sub-assembly and the combination meter assembly.
U0163-87	Lost Communication with Navigation Control Module Missing Message	Communication stops between the meter mirror sub-assembly and the radio receiver assembly or radio and display receiver assembly.
U0164-87	Lost Communication with HVAC Control Module Missing Message	Communication stops between the meter mirror sub-assembly and the air conditioning amplifier assembly.
U023A-87	Lost Communication with Image Processing Module "A" Missing Message	Communication stops between the meter mirror sub-assembly and the forward recognition camera.
U1103-87	Lost Communication with Stop and Start Control Module Missing Message	Communication stops between the meter mirror sub-assembly and the engine stop and start ECU.
U1110-87	Lost Communication with Intuitive Parking Assist Module Missing Message	Communication stops between the meter mirror sub-assembly and the clearance warning ECU assembly.

Central Gateway ECU (Network Gateway ECU) / GTS Display "Central Gateway"
Body Electrical > Central Gateway > Trouble Codes

HINT:

The central gateway ECU (network gateway ECU) is connected to the CAN communication system, but the central gateway ECU (network gateway ECU) does not store or output CAN communication DTCs.
Steering Sensor / GTS Display "Steering Angle Sensor"
Chassis > Steering Angle Sensor > Trouble Codes

HINT:

The steering sensor is connected to the CAN communication system, but the steering sensor does not store or output CAN communication DTCs.
Position Control ECU Assembly LH / GTS Display "Driver Seat"
Body Electrical > Driver Seat > Trouble Codes

HINT:

The position control ECU assembly LH is connected to the CAN communication system, but the position control ECU assembly LH does not store or output CAN communication DTCs.

CAN BUS WAVEFORMS

HINT:

This waveform is measured between terminals CANH and GND, and terminals CANL and GND of the central gateway ECU (network gateway ECU). (Use this as a reference for diagnosis of CAN communication lines.)
When malfunctions in multiple ECUs are suspected based on the CAN bus check and DTCs checked using the GTS, check the resistance of the CAN bus using an ohmmeter first. If no problems are found, check the following waveforms.
If a waveform is not similar to one of the following 3 patterns (Group 1), then an open in a CAN main bus line, an open in a CAN branch line, or a short between a CAN line (CANH or CANL) and ground is suspected (Group 2).
Wiggle the connector and wire harness to check if the waveform changes.

CAN bus waveforms (Group 1)

Normal waveform

Open in both of the lines (CANH and CANL) of a CAN branch

HINT:

Waveforms (waveforms shown using dotted lines) are not output from an ECU or sensor connected to a CAN branch with an open circuit in both lines. (Waveforms from other ECUs or sensors are normal.)
Because this waveform is similar to a normal waveform, instead of using the waveform, the malfunctioning part can be narrowed down by performing a CAN bus check.

Short between the CAN bus lines (CANH and CANL)

HINT:

Waveforms disappear.
If the malfunction is in an ECU, disconnecting the ECU will change the waveform. If the waveform does not change, a malfunction in the wire harness is suspected.

CAN bus waveforms (reference) (Group 2)

NOTE:

The following CAN bus waveforms can be used only as reference. The actual measured waveform may differ significantly depending on the location of the open or short circuit.

Open in a CAN branch line (CANH)

HINT:

An abnormal waveform is output from an ECU with an open in one of its CAN branch lines. Because this abnormal output interferes with the signals from other ECUs, the output of other ECUs will also appear abnormal.
Narrow down the malfunctioning part by checking DTCs or performing a CAN bus check, or by checking waveform changes when ECUs or sensors are disconnected. The waveform will change to one for an open in both sides of a CAN branch when the ECU or sensor with an open CAN branch line is disconnected.

Open in a CAN branch line (CANL)

HINT:

An abnormal waveform is output from an ECU with an open in one of its CAN branch lines. Because this abnormal output interferes with the signals from other ECUs, the output of other ECUs will also appear abnormal.
Narrow down the malfunctioning part by checking DTCs or performing a CAN bus check, or by checking waveform changes when ECUs or sensors are disconnected. The waveform will change to one for an open in both sides of a CAN branch when the ECU or sensor with an open CAN branch line is disconnected.

Open in a CAN main bus line (CANH)

HINT:

Waveforms of ECUs or sensors that are closer to the central gateway ECU (network gateway ECU) than the open part are almost normal.
Waveforms of ECUs or sensors that are on the opposite side of the central gateway ECU (network gateway ECU) from the open part are abnormal.
An open in a CAN main bus line can be confirmed by measuring the resistance between the CANH and CANL terminals of any CAN branch.

Short between a CAN bus line (CANH) and ground

HINT:

Narrow down the shorted part by checking for waveform changes when disconnecting connectors from the CAN junction connectors or when disconnecting ECUs or sensors.
A short to ground in the CANH line can be confirmed by measuring the resistance between CANH and ground using an ohmmeter.

Short between a CAN bus line (CANL) and ground

HINT:

Narrow down the shorted part by checking for waveform changes when disconnecting connectors from the CAN junction connectors or when disconnecting ECUs or sensors.
A short to ground in the CANL line can be confirmed by measuring the resistance between CANL and ground using an ohmmeter.