LIGHTING SYSTEM Rear Fog Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the rear fog light.

WIRING DIAGRAM

A01LVWGE02

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK OPERATION (TAILLIGHTS)


    1. Check the operation of the taillights.

      OK
      Taillights operate normally.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  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 relay operates.


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Rear Fog Light Relay Rear fog light relay ON/OFF Light control switch is in tail position

      Body Electrical > Main Body > Active Test
      Tester Display
      Rear Fog Light Relay
      OK
      Rear fog light relay operates. (Rear fog light comes on.)
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

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


    1. for LHD:


      1. Disconnect the Q12 rear light assembly LH connector.

      2. Disconnect the 3E instrument panel junction block assembly connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q12-1 (B) - 3E-40 Always Below 1 Ω
        Q12-1 (B) - Body ground Always 10 kΩ or higher

    2. for RHD:


      1. Disconnect the Q10 rear light assembly RH connector.

      2. Disconnect the 3E instrument panel junction block assembly connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q10-1 (B) - 3E-40 Always Below 1 Ω
        Q10-1 (B) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY - BODY GROUND)


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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      Q12-2 (E) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      Q10-2 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT REAR LIGHT ASSEMBLY


    1. Remove the rear light assembly.

      Click here

    2. Inspect the rear light assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR FOG LIGHT SOCKET PLUG Click here

    OK

  6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      for LHD: Click here

      for RHD: Click here

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

      A01M1U5C01
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    3. Connect a positive (+) lead from the battery to terminal 3B-1.

    4. Connect a negative (-) lead from the battery to terminal MB-14 (TRLY) and MB-27 (RFGO).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3E-40 - Battery negative terminal Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for LHD: Click here
    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for RHD: Click here