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

Click here

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.*

    *: w/ Door Control Battery

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 Door switch signal ON or OFF

      ON: Door switch on

      OFF: Door switch off

      		 -
      Dome Light SW Front dome light switch signal ON or OFF

      ON: Front dome light switch on

      OFF: Front dome light 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)


    1. Disconnect the T6 and T7 map light assembly connectors.

    2. Disconnect the I47 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
      T7-18 (DOOR) - I47-27 (DMDR) Always Below 1 Ω
      T7-19 (CILL) - I47-28 (DMON) Always Below 1 Ω
      T7-20 (GND9) - Body ground Always 10 kΩ or higher
      T7-18 (DOOR) or I47-27 (DMDR) - Body ground Always 10 kΩ or higher
      T7-19 (CILL) or I47-28 (DMON) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR