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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System (Int) - Diagnostics & Circuit Tests (1 Of 2) >> Lighting System >> Back Door Courtesy Switch Circuit [11/2023 - ] >> Procedure

Back Door Courtesy Switch Circuit [11/2023 - ]: Procedure

  1. READ VALUE USING GTS 
    1. Read the Data List according to the display on the GTS.

      Body Electrical > Main Body > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Back Door Courtesy Switch Status Back door courtesy switch signal Close or Open Close: Back door closed
      Open: Back door open      		 -

      Body Electrical > Main Body > Data List 

      Tester Display
      Back Door Courtesy Switch Status

      OK

      Normal conditions listed above are displayed.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2023 - ]  

    Result: 

    NG 

    See step  2

  2. CONFIRM MODEL 

    Result

    Result Proceed to
    w/o Power Back Door System A
    w/ Power Back Door System B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  3

  3. INSPECT BACK DOOR LOCK ASSEMBLY WITH COURTESY LIGHT SWITCH 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE BACK DOOR LOCK ASSEMBLY WITH COURTESY LIGHT SWITCH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY WITH COURTESY LIGHT SWITCH - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8G power distribution box assembly connector.
    2. Disconnect the W12 back door lock assembly with courtesy light switch connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      W12-3 (D+) - 8G-2 Always Below 1 Ω
      W12-3 (D+) or 8G-2 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. INSPECT POWER DISTRIBUTION BOX ASSEMBLY 
    1. Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

      Refer to REMOVAL [11/2023 - ]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      8G-2 - MB-19 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

  6. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK DOOR ECU - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8G power distribution box assembly connector.
    2. Disconnect the W28 multiplex network door ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      W28-1 (CTYO) - 8G-2 Always Below 1 Ω
      W28-1 (CTYO) or 8G-2 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. INSPECT POWER DISTRIBUTION BOX ASSEMBLY 
    1. Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

      Refer to REMOVAL [11/2023 - ]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      8G-2 - MB-19 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

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