LIGHTING SYSTEM Ambient Illumination Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the instrument panel ambient illumination light (instrument panel light assembly).

WIRING DIAGRAM

B006YT6E01

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

  • The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. Therefore, before performing this troubleshooting procedure, make sure to perform an on-vehicle inspection to confirm that the main body ECU (multiplex network body ECU) power source circuit is normal.*2

    Click here


    • *1: w/ Smart Entry and Start System

    • *2: w/ Door Control Battery

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
      Interior Illumination Light1 Instrument panel ambient illumination light (Instrument panel light assembly) OFF or ON

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


      • Ignition switch ON

      • Shift lever is in any position other than P

      Body Electrical > Main Body > Active Test
      Tester Display
      Interior Illumination Light1
      OK
      Instrument panel ambient illumination light comes on.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. INSPECT INSTRUMENT PANEL LIGHT ASSEMBLY


    1. Remove the instrument panel ambient illumination light (instrument panel light assembly).

      Click here

    2. Inspect the instrument panel ambient illumination light (instrument panel light assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL AMBIENT ILLUMINATION LIGHT (INSTRUMENT PANEL LIGHT ASSEMBLY) Click here

    OK

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


    1. Disconnect the 3F*1 or 3G*2 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
      3F-1 - Body ground*1 Always 11 to 14 V
      3G-1 - Body ground*2 Always 11 to 14 V

      • *1: for LHD

      • *2: for RHD

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    B006ZGDC26
    *A for LHD *B for RHD
    *a

    Component without harness connected

    (Instrument Panel Junction Block Assembly)

    		 - -

    1. Disconnect the 3B 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
      3B-24 - 3F-1*1 Always Below 1 Ω
      3B-24 - 3G-1*2 Always Below 1 Ω

      • *1: for LHD

      • *2: for RHD

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

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


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3B-24 - K89-2 (B) Always Below 1 Ω
      3B-24 or K89-2 (B) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL LIGHT ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the K53 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K89-1 (E) - K53-20 (LED1) Always Below 1 Ω
      K89-1 (E) or K53-20 (LED1) - 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