LIGHTING SYSTEM Ambient Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the ambient lights.

WIRING DIAGRAM

B00406BE06

CAUTION / NOTICE / HINT

Note


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

  • 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. CONFIRM SYMPTOMS


    1. Confirm problem symptoms.

      Result
      Result Proceed to
      Ambient lights do not come on A
      Ambient light dimmer control does not operate B

    B

    PERFORM ACTIVE TEST USING GTS Click here

    A

  2. 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. Check that the ambient lights come on.


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Interior Illumination Light1 Ambient lights ON or OFF

      Precondition for using the Active Test to turn lights on and off:


      • Ignition switch is turned off just before performing the Active Test.

      Body Electrical > Main Body > Active Test
      Tester Display
      Interior Illumination Light1
      OK
      All ambient lights come on.
      Result
      Result Proceed to
      OK A
      NG (All ambient lights do not illuminate) B
      NG (Ambient light does not illuminate (for Front Door)) C
      NG (Ambient light does not illuminate (for Rear Door))
      NG (Ambient light does not illuminate (for Instrument Panel Side))

    A

    PROBLEM SYMPTOMS TABLE FOR EACH PROBLEM SYMPTOM Click here

    C

    GO TO PROBLEM SYMPTOMS TABLE FOR EACH PROBLEM SYMPTOM Click here

    B

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 4L instrument panel junction block assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      4L-1 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      Click here

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

      Click here

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

      B003ZAMC05
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      4L-1 - 4H-22 Always Below 1 Ω
      4L-1 - 4D-31 Always Below 1 Ω
      4H-27 - MB-26 (LED1) Always Below 1 Ω
      4D-9 - MB-26 (LED1) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

  5. 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. Check that the ambient lights come on.


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Interior Illumination Light1 Ambient lights ON or OFF

      Preconditions for using the Active Test to check dimmer controlled illumination:


      • Engine running

      • Shift lever is in any position other than P.

      Body Electrical > Main Body > Active Test
      Tester Display
      Interior Illumination Light1
      OK
      Ambient light dimmer control operates.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

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