LIGHTING SYSTEM Ambient Illumination Light Circuit

DESCRIPTION

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

WIRING DIAGRAM

Figure 1. for LHD:

B000Q5TE04

Figure 2. for RHD:

B000Q5TE03

CAUTION / NOTICE / HINT

Note


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

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

PROCEDURE


  1. CHECK AMBIENT ILLUMINATION LIGHTS


    1. Check the illumination of each ambient illumination lights.

      Result
      Result Proceed to
      Multi-display (interior illumination light assembly) does not illuminate. A
      Front door trim board sub-assembly (door ambient illumination light) does not illuminate. B

    B

    PERFORM ACTIVE TEST USING GTS Click here

    A

  2. PERFORM ACTIVE TEST USING GTS


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

      Click here


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Interior Illumination Light1 Multi-display (interior illumination light assembly) ON or OFF

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


      • Power switch on (READY).

      • Shift lever is in any position other than P.

      Body Electrical > Main Body > Active Test
      Tester Display
      Interior Illumination Light1
      OK
      Multi-display (interior illumination light assembly) turn on or off.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  3. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY [INTERIOR ILLUMINATION LIGHT ASSEMBLY] - BATTERY AND BODY GROUND)


    1. B000P2EC03
      *a

      Front view of wire harness connector

      (to Multi-display Assembly [Interior Illumination Light Assembly])

      Disconnect the multi-display (interior illumination light assembly) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      P1-1 (+B) - Body ground Power switch off 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P1-8 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY [INTERIOR ILLUMINATION LIGHT ASSEMBLY] - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU])


    1. Disconnect the P1 multi-display (interior illumination light assembly) connector.

    2. Disconnect the P9 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
      P1-7 (ILL-) - P9-20 (LED1) Always Below 1 Ω
      P1-7 (ILL-) or P9-20 (LED1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK MULTI-DISPLAY


    1. Replace the multi-display.

      Click here

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

      Click here


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Interior Illumination Light1 Multi-display (interior illumination light assembly) ON or OFF

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


      • Power switch on (READY).

      • Shift lever is in any position other than P.

      Body Electrical > Main Body > Active Test
      Tester Display
      Interior Illumination Light1
      OK
      Multi-display (interior illumination light assembly) turns on.
      Result
      Proceed to
      OK
      NG

    OK

    END (MULTI-DISPLAY IS DEFECTIVE)

    NG

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

  6. PERFORM ACTIVE TEST USING GTS


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

      Click here


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Interior Illumination Light2 Front door trim board sub-assembly (door ambient illumination light) ON or OFF

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


      • Power switch on (READY).

      • Shift lever is in any position other than P.

      Body Electrical > Main Body > Active Test
      Tester Display
      Interior Illumination Light2
      OK
      Front door trim board sub-assembly (door ambient illumination light) turns on or off.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  7. CHECK HARNESS AND CONNECTOR (FRONT DOOR TRIM BOARD SUB-ASSEMBLY - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU])


    1. Disconnect the U5 front door trim board sub-assembly LH (door ambient illumination light LH) connector.

    2. Disconnect the T5 front door trim board sub-assembly RH (door ambient illumination light RH) connector.

    3. Disconnect the P9 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U5-2 (-) - P9-21 (LED2) Always Below 1 Ω
      U5-2 (-) or P9-21 (LED2) - 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