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Back Door Courtesy Switch Circuit [09/2022 - 11/2022]: Procedure

WARNING: This page is about a different car, the 2023 Toyota GR Corolla and 2023 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING TECHSTREAM 
    1. Read the Data List according to the display on the Techstream.

      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 [09/2022 - 11/2022] 

    Result: 

    NG 

    See step  2

  2. INSPECT BACK DOOR LOCK WITH COURTESY LIGHT SWITCH ASSEMBLY 
    1. Inspect the back door lock with courtesy light switch assembly.

      Refer to INSPECTION [06/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE BACK DOOR LOCK WITH COURTESY LIGHT SWITCH ASSEMBLY 

    Refer to REMOVAL [06/2018 - ]

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK WITH COURTESY LIGHT SWITCH ASSEMBLY - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND) 
    1. Disconnect the 8H power distribution box assembly connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      V3-3 (D+) - 8H-5 Always Below 1 Ω
      V3-3 (D+) or 8H-5 - Body ground Always 10 kΩ or higher
      V3-2 (ACT-) - 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 POWER DISTRIBUTION BOX ASSEMBLY 
    1. Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

      Refer to REMOVAL [09/2022 - 11/2022]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      8H-5 - MB-19 (BCTY) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

    Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    NG 

    REPLACE POWER DISTRIBUTION BOX ASSEMBLY 

    Refer to REMOVAL [09/2022 - 11/2022]

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