LIGHTING SYSTEM Front Fog Light does not Illuminate

DESCRIPTION

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

WIRING DIAGRAM

A01ERCKE01

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (HEADLIGHT DIMMER SWITCH)


    1. Using the intelligent tester, read the Data List.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Front Fog Light SW Front fog light switch signal/ON or OFF

      ON: Front fog light switch on

      OFF: Front fog light switch off

      		 -
      OK
      When the headlight dimmer switch operation is performed, the result will be the same as above.

    NG

    INSPECT HEADLIGHT DIMMER SWITCH Click here

    OK

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FRONT FOG LIGHT RELAY)


    1. Using the intelligent tester, perform the Active Test.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Front Fog Light Relay Front fog light ON/OFF -
      OK
      Fog light turns on/off.

    NG

    INSPECT FOG LIGHT RELAY (FR FOG) Click here

    OK

    REPLACE MAIN BODY ECU

  3. INSPECT HEADLIGHT DIMMER SWITCH

    A01EROOE04

    1. A01ER6LE05

      for LHD:


      1. Remove the headlight dimmer switch Click here.

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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        4 (BFG) - 3 (LFG) Headlight dimmer switch (Front fog light switch) on Below 1 Ω
        Headlight dimmer switch (Front fog light switch) off 10 kΩ or higher

    2. for RHD:


      1. Remove the headlight dimmer switch Click here.

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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        7 (BFG) - 8 (LFG) Headlight dimmer switch (Front fog light switch) on Below 1 Ω
        Headlight dimmer switch (Front fog light switch) off 10 kΩ or higher
        Result
        Result Proceed to
        OK A
        NG (for LHD) B
        NG (for RHD) C

    B

    REPLACE HEADLIGHT DIMMER SWITCH Click here

    C

    REPLACE HEADLIGHT DIMMER SWITCH Click here

    A

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU AND BODY GROUND)


    1. A01ER3KE02

      Disconnect the E14 switch connector.

    2. Disconnect the E2 ECU connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      E14-4 (BFG) - E2-28 (FFOG) Always Below 1 Ω
      E14-3 (LFG) - Body ground
      E14-4 (BFG) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      E14-7 (BFG) - E2-28 (FFOG) Always Below 1 Ω
      E14-8 (LFG) - Body ground
      E14-7 (BFG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU

  5. INSPECT FOG LIGHT RELAY (FR FOG)


    1. A01ES2JE06

      Remove the fog light relay from the engine room relay block.

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

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

    NG

    REPLACE FOG LIGHT RELAY

    OK

  6. CHECK HARNESS AND CONNECTOR (FOG LIGHT RELAY - BATTERY)


    1. A01ER56E01

      Remove the fog light relay from the engine room relay block.

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

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    A01ESG3E01

    1. Remove the fog light relay from the engine room relay block.

    2. Disconnect the B1 and B2 light connectors.

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

      Standard Resistance
      for LH
      Tester Connection Condition Specified Condition
      Fog light relay terminal 3 - B1-2 (B) Always Below 1 Ω
      B1-1 (E) - Body ground
      B1-2 (B) - Body ground Always 10 kΩ or higher
      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      Fog light relay terminal 3 - B2-2 (B) Always Below 1 Ω
      B2-1 (E) - Body ground
      B2-2 (B) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK FRONT FOG LIGHT


    1. A01EPW1E03

      Disconnect the E1 ECU connector.

    2. Using a service wire, connect terminal E1-4 (FFGO) on the wire harness side and the body ground.

    3. Check that the front fog light illuminates.

      OK
      Front fog light illuminates.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FOG LIGHT RELAY - MAIN BODY ECU)

    OK

    REPLACE MAIN BODY ECU