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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Blind Spot Monitor System - Diagnostic Codes & Symptom Tests >> Blind Spot Monitor System >> DTC C1AB4-13: Outer Mirror Indicator (Module "B" Side) Circuit Open [11/2023 - ] >> Procedure

DTC C1AB4-13: Outer Mirror Indicator (Module "B" Side) Circuit Open [11/2023 - ]: Procedure

  1. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      w/o Seat Position Memory A
      w/ Seat Position Memory B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  2

  2. 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 "B" > 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  3

  3. CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR ASSEMBLY LH - BLIND SPOT MONITOR SENSOR LH (B) AND BODY GROUND) 
    1. Disconnect the M43 blind spot monitor sensor LH (B) connector.
    2. Disconnect the J37 outer rear view mirror assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M43-4 (OMIL) - J37-3 (BSL+) Always Below 1 Ω
      J37-11 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH 
    1. Disconnect the B outer mirror LH (outer rear view mirror indicator LH) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J37-3 (BSL+) - B-2 (+) Always Below 1 Ω
      J37-11 (E) - B-1 (-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

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

    Result: 

    OK 

    See step  5

  5. INSPECT OUTER MIRROR LH (OUTER REAR VIEW MIRROR INDICATOR LH) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE BLIND SPOT MONITOR SENSOR LH (B). Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPLACE OUTER MIRROR LH (OUTER REAR VIEW MIRROR INDICATOR LH). Refer to  REMOVAL [12/2019 - ] 

  6. CHECK FOR DTC 
    1. Check for DTCs.

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

      Result

      Result Proceed to
      C1AB4-13 is not output A
      C1AB4-13 is output B

    Result: 

    A 

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

    Result: 

    B 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY LH - BLIND SPOT MONITOR SENSOR LH [B] AND BODY GROUND) 

    Pre-procedure1

    1. Disconnect the M43 blind spot monitor sensor LH (B) connector.
    2. Disconnect the J23 outer mirror control ECU assembly LH connector.

      Procedure1

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M43-4 (OMIL) - J23-13 (BDSL) Always Below 1 Ω
      J23-7 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. INSPECT OUTER MIRROR CONTROL ECU ASSEMBLY LH 

    Pre-procedure1

    1. Remove the outer mirror control ECU assembly LH.
      GTY1179454Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Outer Mirror Control ECU Assembly LH)

      Refer to REMOVAL [12/2019 - ]

      Procedure1

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J23-13 (BDSL) - z17-8 (BSL+) Always Below 1 Ω
      J23-7 (GND) - z17-12 (-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    NG 

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

    Result: 

    OK 

    See step  9

  9. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH 

    Pre-procedure1

    1. Disconnect the z17 outer rear view mirror assembly LH connector.
    2. Disconnect the B outer mirror LH (outer rear view mirror indicator LH) connector.

      Procedure1

    3. Measure the resistance according to the value(s) in the table below.
      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      z17-8 (BSL+) - B-3 (+) Always Below 1 Ω
      z17-12 (-) - B-2 (-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

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

    Result: 

    OK 

    See step  10

  10. INSPECT OUTER MIRROR LH (OUTER REAR VIEW MIRROR INDICATOR LH) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE BLIND SPOT MONITOR SENSOR LH (B). Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPLACE OUTER MIRROR LH (OUTER REAR VIEW MIRROR INDICATOR LH). Refer to  REMOVAL [12/2019 - ] 

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