DTC C2121: Transmitter ID 1 not Received (Main); DTC C2122: Transmitter ID 2 not Received (Main); DTC C2123: Transmitter ID 3 not Received (Main); DTC C2124: Transmitter ID 4 not Received (Main); DTC C2125: Transmitter ID 5 not Received (Main); DTC C2181: Transmitter ID 1 not Received (for Test Diagnosis); DTC C2182: Transmitter ID 2 not Received (for Test Diagnosis); DTC C2183: Transmitter ID 3 not Received (for Test Diagnosis); DTC C2184: Transmitter ID 4 not Received (for Test Diagnosis); DTC C2185: Transmitter ID 5 not Received (for Test Diagnosis) [12/2019 - 11/2023]: Procedure

CHECK FREQUENCY RECEIVING CONDITION

Check that the following conditions are not met:

Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.
HINT:

If the vehicle is located in an area such as the one described above, the tire pressure warning light may illuminate after blinking for 1 minute due to interfering radio frequencies.
Devices using similar radio frequencies are used in the vehicle.
HINT:

Radio transmissions may be interrupted due to the surroundings or devices installed by the user.

Result

Result	Proceed to
There is no device or facility that uses electrical waves of approximately the same frequency in the vicinity of the vehicle or inside the vehicle.	A
There is a device or facility that uses electrical waves of approximately the same frequency in the vicinity of the vehicle or inside the vehicle.	B

Result:

See step 10

Result:

See step 2

CONFIRM OUTPUT DTC

Check the stored DTC.

Result

Result	Proceed to
Any DTCs from C2121 to C2124 (C2125: w/ Full Size Spare Tire) are output (C2181 to C2184 (C2185: w/ Full Size Spare Tire) when in Test Mode)	A
All DTCs from C2121 to C2124 (C2125: w/ Full Size Spare Tire) are output (C2181 to C2184 (C2185: w/ Full Size Spare Tire) when in Test Mode)	B

Result:

See step 5

Result:

See step 3

IDENTIFY TRANSMITTER CORRESPONDING TO DTC (TIRE POSITION)

Display the "ID Tire Position" value for each wheel using the GTS.

Refer to the following chart and check the wheel position of the DTC and transmitter match.

Chassis > Tire Pressure Monitor > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
ID 1 Tire Position	ID1 Tire Position	No Information or FL or FR or RL or RR or Spare or Judging	ID1 tire position is displayed	If no tire position information is stored, "No Information" will be displayed.
ID 2 Tire Position	ID2 Tire Position	No Information or FL or FR or RL or RR or Spare or Judging	ID2 tire position is displayed	If no tire position information is stored, "No Information" will be displayed.
ID 3 Tire Position	ID3 Tire Position	No Information or FL or FR or RL or RR or Spare or Judging	ID3 tire position is displayed	If no tire position information is stored, "No Information" will be displayed.
ID 4 Tire Position	ID4 Tire Position	No Information or FL or FR or RL or RR or Spare or Judging	ID4 tire position is displayed	If no tire position information is stored, "No Information" will be displayed.
ID 5 Tire Position	ID5 Tire Position	No Information or FL or FR or RL or RR or Spare or Judging	ID5 tire position is displayed	If no tire position information is stored, "No Information" will be displayed. *1

HINT:

*1: w/ Full Size Spare Tire

Refer to the following chart for the Data List items that correspond to the DTCs.

DTC No.	Detection Item	Data List
C2121	Transmitter ID 1 not Received (Main)	ID1 Tire Position
C2181	Transmitter ID 1 not Received (for Test Diagnosis)	ID1 Tire Position
C2122	Transmitter ID 2 not Received (Main)	ID2 Tire Position
C2182	Transmitter ID 2 not Received (for Test Diagnosis)	ID2 Tire Position
C2123	Transmitter ID 3 not Received (Main)	ID3 Tire Position
C2183	Transmitter ID 3 not Received (for Test Diagnosis)	ID3 Tire Position
C2124	Transmitter ID 4 not Received (Main)	ID4 Tire Position
C2184	Transmitter ID 4 not Received (for Test Diagnosis)	ID4 Tire Position
C2125*1	Transmitter ID 5 not Received (Main)	ID5 Tire Position
C2185*1	Transmitter ID 5 not Received (for Test Diagnosis)	ID5 Tire Position

*1: w/ Full Size Spare Tire

Chassis > Tire Pressure Monitor > Data List

Tester Display
ID 1 Tire Position
ID 2 Tire Position
ID 3 Tire Position
ID 4 Tire Position
ID 5 Tire Position

Result

Proceed to
NEXT

Result:

See step 4

CHECK TRANSMITTER ID

Refer to the following chart and record the tire pressure warning valve and transmitter ID of the output DTC.

Chassis > Tire Pressure Monitor > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Registered ID 1 Code	Registered ID1 code	min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID1 displayed	-
Registered ID 2 Code	Registered ID2 code	min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID2 displayed	-
Registered ID 3 Code	Registered ID3 code	min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID3 displayed	-
Registered ID 4 Code	Registered ID4 code	min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID4 displayed	-
Registered ID 5 Code	Registered ID5 code	min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID5 displayed	*2

HINT:

*1: Displayed only when the ID No. is not registered.
*2: w/ Full Size Spare Tire

Refer to the following chart for the Data List items that correspond to the DTCs.

DTC No.	Detection Item	Data List
C2121	Transmitter ID 1 not Received (Main)	Registered ID 1 code
C2181	Transmitter ID 1 not Received (for Test Diagnosis)	Registered ID 1 code
C2122	Transmitter ID 2 not Received (Main)	Registered ID 2 code
C2182	Transmitter ID 2 not Received (for Test Diagnosis)	Registered ID 2 code
C2123	Transmitter ID 3 not Received (Main)	Registered ID 3 code
C2183	Transmitter ID 3 not Received (for Test Diagnosis)	Registered ID 3 code
C2124	Transmitter ID 4 not Received (Main)	Registered ID 4 code
C2184	Transmitter ID 4 not Received (for Test Diagnosis)	Registered ID 4 code
C2125*2	Transmitter ID 5 not Received (Main)	Registered ID 5 code
C2185*2	Transmitter ID 5 not Received (for Test Diagnosis)	Registered ID 5 code

*2: w/ Full Size Spare Tire

Chassis > Tire Pressure Monitor > Data List

Tester Display
Registered ID 1 Code
Registered ID 2 Code
Registered ID 3 Code
Registered ID 4 Code
Registered ID 5 Code

Disassemble the tire indicated in the output DTC and check the tire pressure warning valve and transmitter ID.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	Tire Pressure Warning Valve and Transmitter	-	-
*a	Transmitter ID (7-digit Number)	-	-

Confirm that the ID number on the transmitter and recorded transmitter ID match.

Result

Result	Proceed to
Match	A
Do not match	B

Result:

REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

Refer to REMOVAL [12/2019 - 11/2023]

Result:

See step 7

TEST MODE INSPECTION (C2181 to C2184 (C2185: w/ Full Size Spare Tire))

Perform a test mode inspection and perform Transmitter Data Reception Check (C2181 to C2184 (C2185: w/ Full Size Spare Tire)).

Refer to TEST MODE PROCEDURE [12/2019 - 11/2023]

Result

Proceed to
OK
NG

Result:

END

Explain to the customer that there is a high possibility that a DTC was output due to temporary electrical wave interference.

Result:

See step 6

CHECK TIRE PRESSURE WARNING VALVE AND TRANSMITTER

Refer to the following chart and record all of the tire pressure warning valve and transmitter IDs.

Chassis > Tire Pressure Monitor > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Registered ID 1 Code	Registered ID1 code	min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID1 displayed	-
Registered ID 2 Code	Registered ID2 code	min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID2 displayed	-
Registered ID 3 Code	Registered ID3 code	min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID3 displayed	-
Registered ID 4 Code	Registered ID4 code	min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID4 displayed	-
Registered ID 5 Code	Registered ID5 code	min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID5 displayed	*2

HINT:

*1: Displayed only when the ID No. is not registered.
*2: w/ Full Size Spare Tire
The wheel position cannot be determined from ID1 through ID5 on the Data List.

Chassis > Tire Pressure Monitor > Data List

Tester Display
Registered ID 1 Code
Registered ID 2 Code
Registered ID 3 Code
Registered ID 4 Code
Registered ID 5 Code

Disassemble all of the tires and check the tire pressure warning valve and transmitter IDs.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	Tire Pressure Warning Valve and Transmitter	-	-
*a	Transmitter ID (7-digit Number)	-	-

Confirm that the ID number on the transmitter and recorded transmitter ID match.

Result

Result	Proceed to
Match	A
Do not match	B

Result:

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

Refer to REMOVAL [12/2019 - 11/2023]

Result:

See step 7

REGISTRATION OF TRANSMITTER ID

Perform registration.

Refer to REGISTRATION [12/2019 - 11/2023]

Result

Proceed to
NEXT

Result:

See step 8

PERFORM INITIALIZATION

Perform initialization.

Refer to INITIALIZATION [12/2019 - 11/2023]

Result

Proceed to
NEXT

Result:

See step 9

CLEAR DTC

Clear the DTCs.

Chassis > Tire Pressure Monitor > Clear DTCs

Result

Proceed to
NEXT

Result:

END

CLEAR DTC

Clear the DTCs.

Chassis > Tire Pressure Monitor > Clear DTCs

Result

Proceed to
NEXT

Result:

END

Explain to the customer that there is a high possibility that a device (located near or inside the vehicle) or facility using electrical waves of approximately the same frequency is causing electrical wave interference.