LIGHTING SYSTEM Front Fog Light Circuit

DESCRIPTION

The main body ECU controls the front fog light relay when a signal is received from the headlight dimmer switch assembly.

WIRING DIAGRAM

A017F3OE23

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the intelligent tester on.

    4. Select the following menu items: Body Electrical / Main Body / Active Test.

    5. Check that the relay operates.

      Main Body:
      Tester Display Test Part Control Range Diagnostic Note
      Front Fog Light Relay Front fog light relay ON/OFF -
      OK
      Front fog light relay operates. (Front fog lights come on.)

    NG

    INSPECT FUSE (FR FOG) Click here

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. INSPECT FUSE (FR FOG)


    1. Remove the FR FOG fuse from the instrument panel junction block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      FR FOG fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  3. INSPECT FOG LIGHT RELAY (FOG)


    1. A017BZ1E87

      Remove the front fog light relay from the instrument panel junction block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Apply the battery voltage between terminals 1 and 2 Below 1 Ω

    NG

    REPLACE FOG LIGHT RELAY

    OK

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


    1. A017FC8E01

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

      Standard voltage
      Tester Connection Condition Specified Condition
      Front fog light relay terminal 5 - Body ground Always 11 to 14 V
      Front fog light relay terminal 1 - Body ground Light control switch OFF → TAIL Below 1 V → 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (FRONT FOG LIGHT RELAY - MAIN BODY ECU)


    1. Disconnect the D7 main body ECU connector.

      A017FU6E03

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

      Standard resistance
      Tester Connection Condition Specified Condition
      Front fog light relay terminal 2 - D7-4 (FFGO) Always Below 1 Ω
      D7-4 (FFGO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)


    1. Reconnect the D7 main body ECU connector.

      A017DZQE05

    2. Install the front fog light relay to the instrument panel junction block.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      D7-4 (FFGO) - Body ground Light control switch in HEAD, front fog light switch OFF → ON 11 to 14 V → Below 1 V

    NG

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT FOG LIGHT RELAY - BODY GROUND)