LIGHTING SYSTEM Rear Fog Light Circuit

DTC Code DTC Name
Rear Fog Light Circuit

DESCRIPTION

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

WIRING DIAGRAM

E241400E02

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

      Table 1. for LHD

      Tester Connection

      Condition

      Specified Condition

      Q12-2 (E) - Body ground

      Always

      Below 1 Ω
      Table 2. 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.

      E259631C01

      *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

    for RHD:Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    for LHD:Click here

    for RHD:Click here