LIGHTING SYSTEM Front Fog Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the front fog lights.

WIRING DIAGRAM

A001R32E02

CAUTION / NOTICE / HINT

Note


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

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

PROCEDURE


  1. CHECK OPERATION (TAILLIGHTS)


    1. Check the operation of the taillights.

      OK
      Taillights operate normally.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  2. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Front Fog Light Relay Front fog lights ON/OFF Light control switch in tail position

      Body Electrical > Main Body > Active Test
      Tester Display
      Front Fog Light Relay
      OK
      Front fog lights come on.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  3. CHECK HARNESS AND CONNECTOR (FR FOG RELAY - AUXILIARY BATTERY)


    1. Remove the FR FOG relay from the No. 4 relay block assembly.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Relay terminal 5 -Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (FR FOG RELAY INPUT VOLTAGE)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Relay terminal 2 - Body ground Light control switch TAIL or HEAD 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (FR FOG RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Click here

    OK

  5. INSPECT FR FOG RELAY


    1. Inspect the FR FOG relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FR FOG RELAY

    OK

  6. CHECK HARNESS AND CONNECTOR (FR FOG RELAY - FOG LIGHT ASSEMBLY RH AND FOG LIGHT ASSEMBLY LH)


    1. Disconnect the A36 fog light assembly LH connector.

    2. Disconnect the A35 fog light assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay terminal 3 - A36-2 (B) Always Below 1 Ω
      Relay terminal 3 - A35-2 (B) Always Below 1 Ω
      Relay terminal 3 or A36-2 (B) - Body ground Always 10 kΩ or higher
      Relay terminal 3 or A35-2 (B) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (FR FOG RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 3A instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay terminal 1 - 3A-52 Always Below 1 Ω
      Relay terminal 1 or 3A-52 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      for LHD: Click here

      for RHD: Click here

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

      A001P06C31
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-52 - MB-7 (FFGO) Always Below 1 Ω
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG (for LHD) C
      NG (for RHD) D

    A

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    B

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    C

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    D

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

  9. CHECK HARNESS AND CONNECTOR (FR FOG RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 3D instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay terminal 2 - 3D-11 Always Below 1 Ω
      Relay terminal 2 or 3D-11 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    B

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR