LIGHTING SYSTEM Back Door Courtesy Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) receives a back door open or closed signal from the back door courtesy light switch.

WIRING DIAGRAM

B006OUAE06

CAUTION / NOTICE / HINT

Note


  • If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.

  • As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.

  • First, check for back door closer system, and after confirming that there is no malfunction, proceed with troubleshooting.

    Click here

PROCEDURE


  1. READ VALUE USING GTS (BACK DOOR COURTESY SW)


    1. Using the GTS, read the Data List.

      Click here


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Back Door Courtesy SW Back door courtesy light switch signal ON or OFF

      ON: Back door open

      OFF: Back door closed

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      Back Door Courtesy SW
      OK
      The display is as specified in the normal condition column.
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  2. INSPECT BACK DOOR LOCK ASSEMBLY (BACK DOOR COURTESY LIGHT SWITCH)


    1. Remove the back door lock assembly (back door courtesy light switch).

      Click here

    2. Inspect the back door lock assembly (back door courtesy light switch).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BACK DOOR LOCK ASSEMBLY (BACK DOOR COURTESY LIGHT SWITCH) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY [BACK DOOR COURTESY LIGHT SWITCH] - JUNCTION BLOCK ASSEMBLY LH AND BODY GROUND)


    1. Disconnect the 4H junction block assembly LH connector.

    2. Disconnect the U9 back door lock assembly (back door courtesy light switch) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U9-8 (CTY) - 4H-36 Always Below 1 Ω
      U9-7 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT JUNCTION BLOCK ASSEMBLY LH


    1. B006RFBE10

      Remove the junction block assembly LH.

      Click here

    2. Remove the main body ECU (multiplex network body ECU) from the junction block assembly LH.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-4 (LGCY) - 4H-36 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPLACE JUNCTION BLOCK ASSEMBLY LH Click here