LIGHTING SYSTEM Interior Light Switch Signal Circuit

DESCRIPTION

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

WIRING DIAGRAM

B006KSQE06

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.

PROCEDURE


  1. READ VALUE USING GTS (DOME LIGHT DOOR SW, DOME LIGHT 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
      Dome Light DOOR SW Map light assembly (dome switch) ON or OFF

      ON: Map light assembly (door switch) on

      OFF: Map light assembly (door switch) off

      		 "ON" is also displayed for this item (for Bulb Type).
      Dome Light SW Map light assembly (dome switch) ON or OFF

      ON: Map light assembly (dome switch) on

      OFF: Map light assembly (dome switch) off

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      Dome Light DOOR SW
      Dome Light SW
      OK
      Normal conditions listed above are displayed.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. INSPECT MAP LIGHT ASSEMBLY


    1. Remove the map light assembly.

      Click here

    2. Inspect the map light assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU])


    1. Disconnect the S26 map light assembly connector.

    2. Disconnect the G62 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S26-4 (DOOR) - G62-27 (DMDR) Always Below 1 Ω
      S26-3 (+B3) - G62-28 (DMON) Always Below 1 Ω
      S26-1 (GND9) - Body ground Always Below 1 Ω
      S26-4 (DOOR) or G62-27 (DMDR) - Body ground Always 10 kΩ or higher
      S26-3 (+B3) or G62-28 (DMON) - 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