LIGHTING SYSTEM Interior Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the operation of the following lights:


WIRING DIAGRAM


  1. A001XXFE01

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin*1.


    • *1: w/ Entry and Start System

Tech Tips

The DOME CUT relay supplies power to the interior lights. If all the lights that use power from the DOME CUT relay do not turn on, check the interior light auto cut circuit first.

Click here

PROCEDURE


  1. PERFORM ACTIVE TEST 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 / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Illuminated Entry System Turns on the lights that are controlled by the illuminated entry system.* ON or OFF -

      • *: Refer to System Description for the lights that are controlled by the illuminated entry system.

        Click here


      Body Electrical > Main Body > Active Test
      Tester Display
      Illuminated Entry System
      OK
      All lights that are controlled by the illuminated entry system come on.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. INSPECT MAP LAMP 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 LAMP ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - NO. 1 ROOM LIGHT ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R2-12(+B1) - R2-4 (RLMP) No. 1 room light switch in DOOR position Below 1 Ω
      No. 1 room light switch in ON position 10 kΩ or higher
      R2-12 (+B1) or R2-4 (RLMP) - Body ground No. 1 room light switch in DOOR position 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 ROOM LIGHT ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (DOME CUT RELAY - MAP LIGHT ASSEMBLY)


    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      R2-12 (+B1) - Body ground Battery saving function not operating 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 3D instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R2-10 (DOOR) - 3D-29 Always Below 1 Ω
      R2-10 (DOOR) or 3D-29 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.


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


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

      A001T17C16
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      3D-29 - MB-1 (ILE) Always Below 1 Ω
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG (for LHD) C
      NG (for RHD) D

    A

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

    B

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

    C

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    D

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here