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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Smart Key System (For Entry) - Diagnostics - Introduction >> SMART KEY SYSTEM (for Entry Function) >> Terminals Of Ecu [12/2019 - 11/2023] >> Terminals Of Ecu [12/2019 - 11/2023]

Terminals Of Ecu [12/2019 - 11/2023]

  1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    GTY862617Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *A for Gasoline Model - -
    1. Disconnect the H48 certification ECU (smart key ECU assembly) connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Input/Output Terminal Description Condition Specified Condition Related Data List Item
      H48-18 (E) - Body ground - Ground Always Below 1 Ω -
      H48-4 (+B) - H48-18 (E) Input Power supply Always*1 11 to 14 V -
      Ignition switch off*2
      H48-15 (CUTB) - H48-18 (E) Input Dark current cut pin*3 Always*1 11 to 14 V -
      Ignition switch off*2
      • *1: for Gasoline Model
      • *2: for HV Model
      • *3: In order to prevent the vehicle auxiliary battery from being depleted when the vehicle is shipped long distances, a fuse that cuts unnecessary electrical load while the vehicle is being shipped is installed in the circuit. If the fuse is removed, the circuit becomes open. If the fuse that is between the vehicle auxiliary battery and terminal CUTB is removed and the circuit is open, the certification ECU (smart key ECU assembly) changes to a certain control mode (example: the transmission of radio waves every 0.25 seconds, which form the detection area, stops).
    3. Reconnect the H48 certification ECU (smart key ECU assembly) connector.
    4. Measure the voltage and check for pulses according to the value(s) in the table below.
      Tester Connection Input/Output Terminal Description Condition Specified Condition Related Data List Item
      H48-17 (IG1D) - H48-18 (E) Output IG power supply Ignition switch off → ignition switch ON Below 1 V → 10 V or higher Power source control 
      1. IG Relay Monitor (Outside)
      H48-16 (ACCD) - H48-18 (E) Output ACC power supply Ignition switch off → ignition switch ACC Below 1 V → 8.5 V or higher Power source control 
      1. ACC Relay Monitor
      M5-17 (CLG1) - H48-18 (E) Output Output to driver door electrical key antenna
      (request signal (challenge) is sent to door electrical key antenna from certification ECU (smart key ECU assembly) to form detection area)      		 Procedure:
      1. Ignition switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought inside detection area*)
      		 Pulse generation
      (See waveform 1)      		 -
      Procedure:
      1. Ignition switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)
      		 Pulse generation
      (See waveform 2)      		 -
      M5-17 (CLG1) - H48-18 (E) Input Input to driver door lock sensor
      (front door outside handle assembly (for driver door) lock sensor on signal is sent to the certification ECU (smart key ECU assembly))      		 Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors closed
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)
      5. Driver door lock sensor touched
      		 Pulse generation
      (See waveform 3)      		 Power source control 
      1. D-Door Trigger Switch
      M5-17 (CLG1) - H48-18 (E) Input Input to driver door unlock sensor
      (when system is in unlock standby mode and unlock sensor is touched, door electrical key antenna sends unlock sensor input signal (sensing) to certification ECU (smart key ECU assembly))      		 Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors locked
      4. Electrical key transmitter sub-assembly not near the vehicle
      5. Driver door unlock sensor touched
      		 Pulse generation
      (See waveform 4)      		 Power source control 
      1. D-Door Touch Sensor
      M5-16 (CG1B) - H48-18 (E) Output Output to driver door electrical key antenna (terminal on opposite side of component from CLG1 output terminal) Procedure:
      1. Ignition switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought inside detection area*)
      		 Pulse generation
      (See waveform 5)      		 -
      Procedure:
      1. Ignition switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)
      		 Pulse generation
      (See waveform 6)      		 -
      M5-15 (CLG2) - H48-18 (E) Output Output to front passenger door electrical key antenna
      (request signal (challenge) is sent to door electrical key antenna from certification ECU (smart key ECU assembly) to form detection area)      		 Procedure:
      1. Ignition switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought inside detection area*)
      		 Pulse generation
      (See waveform 1)      		 -
      Procedure:
      1. Ignition switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)
      		 Pulse generation
      (See waveform 2)      		 -
      M5-15 (CLG2) - H48-18 (E) Input Input to front passenger door lock sensor
      (front door outside handle assembly (for front passenger door) lock sensor on signal is sent to the certification ECU (smart key ECU assembly))      		 Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors closed
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)
      5. Front passenger door lock sensor touched
      		 Pulse generation
      (See waveform 3)      		 Power source control 
      1. P-Door Trigger Switch
      M5-15 (CLG2) - H48-18 (E) Input Input to front passenger door unlock sensor
      (when system is in unlock standby mode and unlock sensor is touched, door electrical key antenna sends unlock sensor input signal (sensing) to certification ECU (smart key ECU assembly))      		 Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors locked
      4. Electrical key transmitter sub-assembly not near the vehicle
      5. Front passenger door unlock sensor touched
      		 Pulse generation
      (See waveform 4)      		 Power source control 
      1. P-Door Touch Sensor
      M5-14 (CG2B) - H48-18 (E) Output Output to front passenger door electrical key antenna (terminal on opposite side of component from CLG2 output terminal) Procedure:
      1. Ignition switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought inside detection area*)
      		 Pulse generation
      (See waveform 5)      		 -
      Procedure:
      1. Ignition switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)
      		 Pulse generation
      (See waveform 6)      		 -
      M5-13 (CLG8) - H48-18 (E) Output Output to electrical key antenna (outside luggage compartment) Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors closed
      4. Back door opener switch assembly → on
      		 Pulse generation
      (See waveform 7)      		 -
      M5-12 (CG8B) - H48-18 (E) Output Output to electrical key antenna (outside luggage compartment) (terminal on opposite side of component from CLG8 output terminal) Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors closed
      4. Back door opener switch assembly → on
      		 Pulse generation
      (See waveform 7)      		 -
      M5-26 (TSW5) - H48-18 (E) Input Back door opener switch assembly (open switch) signal input Back door opener switch assembly (open switch) off → on Pulse generation
      (See waveform 8)      		 Smart Key 
      1. Tr/B-Door Unlock SW
      M5-27 (TSW6) - H48-18 (E) Input Back door opener switch assembly (lock switch) signal input Back door opener switch assembly (lock switch) off → on Pulse generation
      (See waveform 8)      		 Smart Key 
      1. Tr/B-Door Unlock SW
      M5-18 (RCO) - H48-18 (E) Output Output to electrical key and tire pressure warning ECU and receiver
      (Power supply for electrical key and tire pressure warning ECU and receiver. Certification ECU (smart key ECU assembly) outputs 5 V when receiver starts operating.)      		 Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
      3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed
      		 Pulse generation
      (See waveform 9)      		 -
      M5-19 (RDAM) - H48-18 (E) Input Electrical key and tire pressure warning ECU and receiver verifies data received from electrical key transmitter sub-assembly.
      Electrical key and tire pressure warning ECU and receiver sends data from electrical key transmitter sub-assembly to certification ECU (smart key ECU assembly) (Electrical key and tire pressure warning ECU and receiver intermittently grounds 12 V signal from certification ECU (smart key ECU assembly)).      		 Proceed:
      1. Ignition switch off
      2. All doors locked
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
      5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed
      		 Pulse generation
      (See waveform 10)      		 -
      M5-20 (CSEL) - H48-18 (E) Output Communication channel switching circuit Procedure:
      1. Ignition switch off
      2. All doors closed
      		 Below 1 V → Pulse generation -
      1. *: For details about the entry function detection area, refer to Operation Check.

        Refer to OPERATION CHECK [12/2019 - 11/2023] 

    5. Using an oscilloscope, check waveform 1.
      NOTE:

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      GTY448796Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM 1 (REFERENCE)

      Item Content
      Tester Connection M5-17 (CLG1) - H48-18 (E)
      M5-15 (CLG2) - H48-18 (E)
      Tool Setting 5 V/DIV., 500 ms/DIV.
      Condition Procedure:
      1. Ignition switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought inside detection area*)
      1. *: For details about the entry function detection area, refer to Operation Check.

        Refer to OPERATION CHECK [12/2019 - 11/2023] 

    6. Using an oscilloscope, check waveform 2.
      NOTE:

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      GTY427636Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM 2 (REFERENCE)

      Item Content
      Tester Connection M5-17 (CLG1) - H48-18 (E)
      M5-15 (CLG2) - H48-18 (E)
      Tool Setting 5 V/DIV., 100 ms/DIV.
      Condition Procedure:
      1. Ignition switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)
      1. *: For details about the entry function detection area, refer to Operation Check.

        Refer to OPERATION CHECK [12/2019 - 11/2023] 

    7. Using an oscilloscope, check waveform 3.
      NOTE:

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      GTY430392Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Lock sensor not touched
      *b Lock sensor touched
      WAVEFORM 3 (REFERENCE)

      Item Content
      Tester Connection M5-17 (CLG1) - H48-18 (E)
      Tool Setting 5 V/DIV., 40 ms/DIV.
      Condition Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors closed
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)
      5. Driver door lock sensor not touched → touched
      Item Content
      Tester Connection M5-15 (CLG2) - H48-18 (E)
      Tool Setting 5 V/DIV., 40 ms/DIV.
      Condition Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors closed
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)
      5. Front passenger door lock sensor not touched → touched
      1. *: For details about the entry function detection area, refer to Operation Check.

        Refer to OPERATION CHECK [12/2019 - 11/2023] 

    8. Using an oscilloscope, check waveform 4.
      NOTE:

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      GTY438196Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Unlock sensor not touched
      *b Unlock sensor touched
      WAVEFORM 4 (REFERENCE)

      Item Content
      Tester Connection M5-17 (CLG1) - H48-18 (E)
      Tool Setting 5 V/DIV., 50 ms/DIV.
      Condition Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors locked
      4. Electrical key transmitter sub-assembly not near the vehicle
      5. Driver door unlock sensor not touched → touched
      Item Content
      Tester Connection M5-15 (CLG2) - H48-18 (E)
      Tool Setting 5 V/DIV., 50 ms/DIV.
      Condition Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors locked
      4. Electrical key transmitter sub-assembly not near the vehicle
      5. Front passenger door unlock sensor not touched → touched
    9. Using an oscilloscope, check waveform 5.
      NOTE:

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      GTY504760Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM 5 (REFERENCE)

      Item Content
      Tester Connection M5-16 (CG1B) - H48-18 (E)
      M5-14 (CG2B) - H48-18 (E)
      Tool Setting 5 V/DIV., 500 ms/DIV.
      Condition Procedure:
      1. Ignition switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought inside detection area*)
      1. *: For details about the entry function detection area, refer to Operation Check.

        Refer to OPERATION CHECK [12/2019 - 11/2023] 

    10. Using an oscilloscope, check waveform 6.
      NOTE:

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      GTY499393Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM 6 (REFERENCE)

      Item Content
      Tester Connection M5-16 (CG1B) - H48-18 (E)
      M5-14 (CG2B) - H48-18 (E)
      Tool Setting 5 V/DIV., 100 ms/DIV.
      Condition Procedure:
      1. Ignition switch off
      2. All doors closed
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)
      1. *: For details about the entry function detection area, refer to Operation Check.

        Refer to OPERATION CHECK [12/2019 - 11/2023] 

    11. Using an oscilloscope, check waveform 7.
      NOTE:

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      GTY432845Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM 7 (REFERENCE)

      Item Content
      Tester Connection M5-13 (CLG8) - H48-18 (E)
      M5-12 (CG8B) - H48-18 (E)
      Tool Setting 2 V/DIV., 500 ms/DIV.
      Condition Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly brought outside vehicle
      3. All doors closed
      4. Back door opener switch assembly → on
    12. Using an oscilloscope, check waveform 8.
      NOTE:

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      GTY379040Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Checking for switch on signal at short intervals
      WAVEFORM 8 (REFERENCE)

      Item Content
      Tester Connection M5-26 (TSW5) - H48-18 (E)
      Tool Setting 2 V/DIV., 500 ms/DIV.
      Condition Back door opener switch assembly off (open switch) → on
      Item Content
      Tester Connection M5-27 (TSW6) - H48-18 (E)
      Tool Setting 2 V/DIV., 500 ms/DIV.
      Condition Back door opener switch assembly (lock switch) off → on
    13. Using an oscilloscope, check waveform 9.
      NOTE:

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      GTY376258Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Before lock or unlock switch of electrical key transmitter sub-assembly pressed
      *b After lock or unlock switch of electrical key transmitter sub-assembly pressed
      WAVEFORM 9 (REFERENCE)

      Item Content
      Tester Connection M5-18 (RCO) - H48-18 (E)
      Tool Setting 2 V/DIV., 500 ms/DIV.
      Condition Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
      3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed
    14. Using an oscilloscope, check waveform 10.
      NOTE:

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      GTY367752Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Before lock or unlock switch of electrical key transmitter sub-assembly pressed
      *b After lock or unlock switch of electrical key transmitter sub-assembly pressed
      WAVEFORM 10 (REFERENCE)

      Item Content
      Tester Connection M5-19 (RDAM) - H48-18 (E)
      Tool Setting 5 V/DIV., 500 ms/DIV.
      Condition Procedure:
      1. Ignition switch off
      2. All doors locked
      3. Electrical key transmitter sub-assembly not inside vehicle
      4. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
      5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed
  2. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 
    GTY918438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

      Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Input/Output Terminal Description Condition Specified Condition
      MB-11 (GND1) - Body ground - Ground Always Below 1 Ω
      MB-31 (BECU) - Body ground Input Auxiliary battery power supply (for CPU) Always*1 11 to 14 V
      Ignition switch off*2
      • *1: for Gasoline Model
      • *2: for HV Model
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