LIGHTING SYSTEM Rear Fog Light Circuit

DESCRIPTION

The main body ECU receives a rear fog light switch information signal from the light control switch (rear fog switch), and illuminates the rear fog lights.

WIRING DIAGRAM

A003AJZE03

INSPECTION PROCEDURE

Tech Tips

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (REAR FOG LIGHT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Active Test / Rear Fog Light.

    5. Check that the rear fog lights turn on/off.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Rear Fog Light Relay Rear fog light ON or OFF -
      OK
      Rear fog lights turn on/off.

    NG

    CHECK HARNESS AND CONNECTOR (REAR FOG LIGHT BULB - BATTERY) Click here

    OK

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

  2. CHECK HARNESS AND CONNECTOR (REAR FOG LIGHT BULB - BATTERY)


    1. A003EDAE03

      for LHD:


      1. Disconnect the G18 or M9 rear fog light bulb connector.

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

        Standard Voltage
        for Sedan
        Tester Connection Switch Condition Specified Condition
        G18-2 - Body ground Light control switch TAIL, rear fog light switch on 11 to 14 V
        Light control switch TAIL, rear fog light switch off Below 1 V
        for Wagon
        Tester Connection Switch Condition Specified Condition
        M9-2 - Body ground Light control switch TAIL, rear fog light switch on 11 to 14 V
        Light control switch TAIL, rear fog light switch off Below 1 V

    2. for RHD:


      1. Disconnect the G19 or M10 rear fog light bulb connector.

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

        Standard Voltage
        for Sedan
        Tester Connection Switch Condition Specified Condition
        G19-2 - Body ground Light control switch TAIL, rear fog light switch on 11 to 14 V
        Light control switch TAIL, rear fog light switch off Below 1 V
        for Wagon
        Tester Connection Switch Condition Specified Condition
        M10-2 - Body ground Light control switch TAIL, rear fog light switch on 11 to 14 V
        Light control switch TAIL, rear fog light switch off Below 1 V

    NG

    INSPECT REAR FOG LIGHT RELAY (RR REAR FOG) Click here

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (REAR FOG LIGHT BULB - BODY GROUND)

  3. INSPECT REAR FOG LIGHT RELAY (RR REAR FOG)


    1. A003C41E04

      Remove the RR FOG relay from the No. 1 relay block.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3 - 5 Battery voltage not applied to terminals 1 and 2 10 Ω or higher
      Battery voltage applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE RR FOG LIGHT RELAY

    OK

  4. CHECK HARNESS AND CONNECTOR (RR FOG RELAY - BATTERY AND TAIL RELAY)


    1. A003AV2E01
      Text in Illustration
      *1

      Component without relay connected

      (No. 1 Relay Block)
      *2 RR FOG Relay

      Remove the RR FOG relay from the No. 1 relay block.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      RR FOG relay terminal 2 - Body ground Light control switch TAIL 11 to 14 V
      RR FOG relay terminal 5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (RR FOG RELAY - REAR FOG LIGHT BULB)


    1. A003CM3E04

      Remove the RR FOG relay from the No. 1 relay block.

    2. for LHD:


      1. Disconnect the G18 or M9 rear fog light connector.

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

        Standard Resistance
        for Sedan
        Tester Connection Condition Specified Condition
        RR FOG relay terminal 3 - G18-2 Always Below 1 Ω
        RR FOG relay terminal 3 - Body ground Always 10 Ω or higher
        for Wagon
        Tester Connection Condition Specified Condition
        RR FOG relay terminal 3 - M9-2 Always Below 1 Ω
        RR FOG relay terminal 3 - Body ground Always 10 Ω or higher

    3. for RHD:


      1. Disconnect the G19 or M10 rear fog light connector.

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

        Standard Resistance
        for Sedan
        Tester Connection Condition Specified Condition
        RR FOG relay terminal 3 - G19-2 Always Below 1 Ω
        RR FOG relay terminal 3 - Body ground Always 10 Ω or higher
        for Wagon
        Tester Connection Condition Specified Condition
        RR FOG relay terminal 3 - M10-2 Always Below 1 Ω
        RR FOG relay terminal 3 - Body ground Always 10 Ω or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (RR FOG RELAY - MAIN BODY ECU)


    1. A003DABE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU)

      Disconnect the D80 main body ECU connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D80-11 (RFGO) - Body ground Light control switch TAIL 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU