LIGHTING SYSTEM Front Door Courtesy Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects the condition of the front door courtesy light switch assembly.

WIRING DIAGRAM

A018MHWE01
*a Front Door Courtesy Light Switch Assembly RH
*b Front Door Courtesy Light Switch Assembly LH
*c Main Body ECU (Multiplex Network Body ECU)

CAUTION / NOTICE / HINT

Note


  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.*1

  • 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.*2

    Click here


  • *1: w/ Smart Entry and Start System

  • *2: for LHD

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Data List.

    5. 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
      FR Door Courtesy SW Front door courtesy light switch assembly RH signal ON or OFF

      ON: Front door RH open

      OFF: Front door RH closed

      		 -
      FL Door Courtesy SW Front door courtesy light switch assembly LH signal ON or OFF

      ON: Front door LH open

      OFF: Front door LH closed

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      FR Door Courtesy SW
      FL Door Courtesy SW
      OK
      Normal conditions listed above are displayed.
      Result
      Result Proceed to
      OK A
      FR Door Courtesy SW is not normal B
      FL Door Courtesy SW is not normal C

    A

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

    C

    INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH Click here

    B

  2. INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH


    1. Remove the front door courtesy light switch assembly RH.

      Click here

    2. Inspect the front door courtesy light switch assembly RH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the F19 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L1-1 - F19-27 (FRCY) Always Below 1 Ω
      L1-1 or F19-27 (FRCY) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH


    1. Remove the front door courtesy light switch assembly LH.

      Click here

    2. Inspect the front door courtesy light switch assembly LH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the F19 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      M1-1 - F19-6 (FLCY) Always Below 1 Ω
      M1-1 or F19-6 (FLCY) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR