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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System (Except HV) - Circuit Tests (2 Of 8) >> CAN COMMUNICATION SYSTEM (for Gasoline Model) >> Tire Pressure Monitor ECU Communication Stop Mode [11/2023 - ] >> Procedure

Tire Pressure Monitor ECU Communication Stop Mode [11/2023 - ]: Procedure

  1. CHECK FOR OPEN IN CAN BUS LINES (TIRE PRESSURE WARNING ECU AND RECEIVER BRANCH LINE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the M51 tire pressure warning ECU and receiver connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M51-9 (CANH) - M51-10 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      GTY1177789Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Tire Pressure Warning ECU and Receiver)

      Result

      Proceed to 
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER) 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M51-12 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
      GTY1178347Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Tire Pressure Warning ECU and Receiver)

      Result

      Proceed to 
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) 

    Result: 

    OK 

    See step  3

  3. CHECK VEHICLE TYPE 
    1. Check vehicle type.

      Result

      Result Proceed to
      w/ Stop and Start System A
      w/o Stop and Start System B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Reconnect the cable to the negative (-) battery terminal.
    2. Measure the voltage according to the value(s) in the table below.
      GTY908179Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Tire Pressure Warning ECU and Receiver)

      Standard Voltage

      Tester Connection Condition Specified Condition
      M51-1 (IG) - Body ground Ignition switch ON 10.5 to 16 V
      M51-7 (+B) - Body ground Always 10.5 to 16 V

      Result

      Proceed to 
      OK
      NG

    Result: 

    OK 

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    GO TO STOP AND START SYSTEM (FOR BACKUP BOOST CONVERTER CIRCUIT) 

    Refer to Backup Boost Converter Circuit [11/2023 - ]

  5. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Reconnect the cable to the negative (-) battery terminal.
    2. Measure the voltage according to the value(s) in the table below.
      GTY908179Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Tire Pressure Warning ECU and Receiver)

      Standard Voltage

      Tester Connection Condition Specified Condition
      M51-1 (IG) - Body ground Ignition switch ON 11 to 14 V
      M51-7 (+B) - Body ground Always 11 to 14 V

      Result

      Proceed to 
      OK
      NG

    Result: 

    OK 

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

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