LIGHTING SYSTEM Rear Fog Light Circuit

DESCRIPTION

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

WIRING DIAGRAM

A0054C1E01

CAUTION / NOTICE / HINT

Note

As the door control battery is installed between the vehicle battery and main body ECU (instrument panel junction block assembly), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (instrument panel junction block assembly) before performing this troubleshooting 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 GTS (REAR FOG LIGHT)


    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 / Rear Fog Light Relay.

    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.

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    NG

  2. INSPECT RR FOG RELAY


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

    2. Inspect the RR FOG relay Click here.


    NG

    REPLACE RR FOG RELAY

    OK

  3. CHECK HARNESS AND CONNECTOR (REAR FOG LIGHT - BODY GROUND)


    • *1: for LHD

    • *2: for RHD


    1. A0053VHE02
      Text in Illustration
      *A for Sedan
      *B for Wagon
      *C for LHD
      *D for RHD
      *a

      Front view of wire harness connector

      (to Rear Fog Light)

      for Sedan:


      1. Disconnect the G55*1 or G54*2 rear fog light connector.

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

        Standard Voltage
        for LHD
        Tester Connection Switch Condition Specified Condition
        G55-2 (B) - 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 RHD
        Tester Connection Switch Condition Specified Condition
        G54-2 (B) - 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 Wagon:


      1. Disconnect the M15*1 or M16*2 rear light connector.

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

        Standard Voltage
        for LHD
        Tester Connection Switch Condition Specified Condition
        M15-2 (B) - 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 RHD
        Tester Connection Switch Condition Specified Condition
        M16-2 (B) - 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

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A0056DNE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Rear Fog Light Relay [RR FOG])

      Remove the rear fog light relay from the No. 1 relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Rear fog light relay terminal 2 - Body ground Light control switch TAIL 11 to 14 V
      Rear fog light relay terminal 5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (REAR FOG LIGHT - REAR FOG LIGHT RELAY AND BODY GROUND)


    • *1: for LHD

    • *2: for RHD


    1. Remove the rear fog light relay from the No. 1 relay block.

    2. for Sedan:


      1. Disconnect the G55*1 or G54*2 rear fog light connector.

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

        Standard Resistance
        for LHD
        Tester Connection Condition Specified Condition
        G55-2 (B) - Rear fog light relay terminal 3 Always Below 1 Ω
        G55-2 (B) - Body ground Always 10 kΩ or higher
        G55-1 (E) - Body ground Always Below 1 Ω
        for RHD
        Tester Connection Condition Specified Condition
        G54-2 (B) - Rear fog light relay terminal 3 Always Below 1 Ω
        G54-2 (B) - Body ground Always 10 kΩ or higher
        G54-1 (E) - Body ground Always Below 1 Ω

    3. for Wagon:


      1. Disconnect the M15*1 or M16*2 rear light connector.

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

        Standard Resistance
        for LHD
        Tester Connection Condition Specified Condition
        M15-2 (B) - Rear fog light relay terminal 3 Always Below 1 Ω
        M15-2 (B) - Body ground Always 10 kΩ or higher
        M15-1 (E) - Body ground Always Below 1 Ω
        for RHD
        Tester Connection Condition Specified Condition
        M16-2 (B) - Rear fog light relay terminal 3 Always Below 1 Ω
        M16-2 (B) - Body ground Always 10 kΩ or higher
        M16-1 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (REAR FOG LIGHT RELAY - MAIN BODY ECU [INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY])


    1. A0054TNE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Main Body ECU [Instrument Panel Junction Block Assembly])

      Disconnect the main body ECU (instrument panel junction block assembly) 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

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR