LIGHTING SYSTEM Front Fog Light does not Illuminate

WIRING DIAGRAM

A000U79E03

CAUTION / NOTICE / HINT

Note


  • First perform the communication function inspections in HOW TO PROCEED WITH TROUBLESHOOTING to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (FRONT FOG LIGHT)


    1. Using the GTS, perform the Active Test Click here.

      Body No. 5
      Tester Display Test Part Control Range
      Front Fog Light Relay Front fog light illumination operation OFF - ON
      OK
      Front fog light condition is switched by Active Test
      Result
      Result Proceed to
      NG A
      OK B

    B

    READ VALUE USING GTS (HEADLIGHT DIMMER SWITCH) Click here

    A

  2. CHECK MULTIPLEX NETWORK FRONT LIGHT ECU (FFGO VOLTAGE)

    A000VSOE08
    *1 Component with harness connected: (Multiplex Network Front Light ECU)

    1. Remove the multiplex network front light ECU with its connector still connected.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      6 (FFGO) - Body ground Headlight dimmer switch (Fr FOG) OFF 11 to 14 V
      6 (FFGO) - Body ground Headlight dimmer switch (Fr FOG) ON Below 1 V

    NG

    CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK FRONT LIGHT ECU - ENGINE ROOM NO. 2 RELAY BLOCK) Click here

    OK

  3. CHECK ENGINE ROOM NO. 2 RELAY BLOCK

    A000VP8E01
    *1 Component with harness connected: (Engine Room No. 2 Relay Block)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I-8 - Body ground Headlight dimmer switch (Fr FOG) ON 11 to 14 V

    NG

    REPLACE ENGINE ROOM NO. 2 RELAY BLOCK

    OK

  4. INSPECT ENGINE ROOM NO. 2 RELAY BLOCK

    A000TEDE02
    *1 Component without harness connected: (Engine Room No. 2 Relay Block)

    1. Disconnect the 2C engine room No. 2 relay block connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2C-15 - I-8 Always Below 1 Ω
      2C-21 - I-8 Always Below 1 Ω

    NG

    REPLACE ENGINE ROOM NO. 2 RELAY BLOCK

    OK

  5. CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 2 RELAY BLOCK - FOG LIGHT)

    A000VYBE02

    1. Disconnect the 2C engine room No. 2 relay block connector.

    2. Disconnect the A93*1 or A97*2 fog light connector.


      • *1: for LH

      • *2: for RH

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

      Standard Resistance
      for LH
      Tester Connection Condition Specified Condition
      2C-15 - A93-2 Always Below 1 Ω
      A93-1 - Body ground Always Below 1 Ω
      2C-15 - Body ground Always 10 kΩ or higher
      for RH
      Tester Connection Condition Specified Condition
      2C-21 - A97-2 Always Below 1 Ω
      A97-1 - Body ground Always Below 1 Ω
      2C-21 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for Sport Package) A
      OK (except Sport Package) B
      NG C

    A

    REPLACE FOG LIGHT ASSEMBLY Click here

    B

    REPLACE FOG LIGHT ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. READ VALUE USING GTS (HEADLIGHT DIMMER SWITCH)


    1. Using the GTS, read the Data List Click here.

      Combination Switch
      Tester Display Measurement Item/Display Normal Condition Diagnostic Note
      Front Fog Light Switch Headlight dimmer switch signal (Fr fog position)/ON or OFF

      ON: Front fog light switch ON

      OFF: Front fog light switch OFF

      		 -
      OK
      Condition sign can be displayed

    NG

    REPLACE HEADLIGHT DIMMER SWITCH Click here

    OK

  7. CHECK WINDSHIELD WIPER SWITCH (OPERATION)


    1. Temporarily replace the windshield wiper switch with a new or normally functioning one Click here.

    2. Check the windshield wiper switch operation.

      OK
      Windshield wiper switch operation is normal

    OK

    END (WINDSHIELD WIPER SWITCH WAS DEFECTIVE)

    NG

  8. CHECK MULTIPLEX NETWORK FRONT LIGHT ECU (OPERATION)


    1. Temporarily replace the multiplex network front light ECU with a new or normally functioning one.

    2. Check the front fog light operation.

      OK
      Front fog light operation is normal

    OK

    END (MULTIPLEX NETWORK FRONT LIGHT ECU WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

  9. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK FRONT LIGHT ECU - ENGINE ROOM NO. 2 RELAY BLOCK)

    A000TKLE01
    *1 Front view of wire harness connector: (to Multiplex Network Front Light ECU)
    *2 Front view of wire harness connector: (to Engine Room No. 2 Relay Block)

    1. Disconnect the A50 multiplex network front light ECU connector.

    2. Disconnect the 2G engine room No. 2 relay block connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A50-6 (FFGO) - 2G-5 Always Below 1 Ω
      A50-6 (FFGO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK ENGINE ROOM NO. 2 RELAY BLOCK

    A000VP8E01
    *1 Component with harness connected: (Engine Room No. 2 Relay Block)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I-7 - Body ground Always 11 to 14 V

    OK

    REPLACE ENGINE ROOM NO. 2 RELAY BLOCK

    NG

  11. INSPECT ENGINE ROOM NO. 2 RELAY BLOCK

    A000VHIE02
    *1 Component without harness connected: (Engine Room No. 2 Relay Block)

    1. Disconnect the 2F engine room No. 2 relay block connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2F-1 - I-7 Always Below 1 Ω

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ENGINE ROOM NO. 2 RELAY BLOCK)

    NG

    REPLACE ENGINE ROOM NO. 2 RELAY BLOCK