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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Collision/Avoidance >> Blind Spot Monitor System - Diagnostic Codes & Symptom Tests >> Blind Spot Monitor System >> DTC C1AB1: Short to +B in Outer Mirror Indicator (Slave) [12/2019 - 11/2023] >> Procedure

DTC C1AB1: Short to +B in Outer Mirror Indicator (Slave) [12/2019 - 11/2023]: Procedure

  1. CHECK DTC 
    1. Turn the ignition switch off.
    2. Turn the ignition switch to ON.
    3. Recheck for DTCs and check if the same DTC is output again.

      Body Electrical > Blind Spot Monitor Slave > Trouble Codes 

      OK

      No DTCs are output.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    NG 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR INDICATOR CIRCUIT) 
    1. Disconnect the M2 blind spot monitor sensor RH (slave) connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      M2-4 (OMIR) - Body ground Ignition switch ON Below 1 V
      GTY921060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Blind Spot Monitor Sensor RH (Slave))

      Result

      Result Proceed to
      OK A
      NG (w/ Seat Position Memory System) B
      NG (w/o Seat Position Memory System) C

    Result: 

    A 

    REPLACE BLIND SPOT MONITOR SENSOR RH (SLAVE). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    C 

    See step  6

    Result: 

    B 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR INDICATOR CIRCUIT) 
    1. Disconnect the IND1 outer mirror RH connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      M2-4 (OMIR) - Body ground Ignition switch ON Below 1 V
      GTY921060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Blind Spot Monitor Sensor RH (Slave))

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE OUTER MIRROR RH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR INDICATOR CIRCUIT) 
    1. Disconnect the z16 outer rear view mirror assembly RH connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      M2-4 (OMIR) - Body ground Ignition switch ON Below 1 V
      GTY921060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Blind Spot Monitor Sensor RH (Slave))

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH. Refer to  REMOVAL [12/2019 - 11/2023] 

    Result: 

    NG 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR INDICATOR CIRCUIT) 
    1. Disconnect the J7 outer mirror control ECU assembly RH connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      M2-4 (OMIR) - Body ground Ignition switch ON Below 1 V
      GTY921060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Blind Spot Monitor Sensor RH (Slave))

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY RH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR INDICATOR CIRCUIT) 
    1. Disconnect the IND1 outer mirror RH connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      M2-4 (OMIR) - Body ground Ignition switch ON Below 1 V
      GTY921060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Blind Spot Monitor Sensor RH (Slave))

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE OUTER MIRROR RH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR INDICATOR CIRCUIT) 
    1. Disconnect the J15 outer rear view mirror assembly RH connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      M2-4 (OMIR) - Body ground Ignition switch ON Below 1 V
      GTY921060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Blind Spot Monitor Sensor RH (Slave))

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH. Refer to  REMOVAL [12/2019 - 11/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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