LIGHTING SYSTEM Front Fog Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) receives headlight dimmer switch information signals, and illuminates the front fog light.

WIRING DIAGRAM

A005JVZE04

CAUTION / NOTICE / HINT

Tech Tips

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

Note

Initialization is necessary when the main body ECU (multiplex network body ECU) is replaced Click here.*


  • *: w/ Automatic Light Control System

PROCEDURE


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


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

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Front Fog Light Relay Front fog light relay ON/OFF Light control switch is in TAIL position
      OK
      Front fog light relay operates (front fog lights come on).
      Result
      Result Proceed to
      NG A
      OK B

    B

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

    A

  2. INSPECT FRONT FOG LIGHT RELAY (FR FOG)


    1. Remove the front fog light relay from the No. 5 relay block.

    2. Inspect the front fog light relay Click here.


    NG

    REPLACE FRONT FOG LIGHT RELAY (FR FOG)

    OK

  3. CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK)


    1. Disconnect the 3E*1 or 3F*2 instrument panel junction block assembly connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      3E-1 - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      3F-1 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (FRONT FOG LIGHT RELAY - INSTRUMENT PANEL JUNCTION BLOCK)


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

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

      A005HXSE02
      Text in Illustration
      *a

      No. 5 Relay Block

      (FR FOG Relay Terminal)

      		 *b

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)
      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      Relay terminal 1 - 3A-15 Always Below 1 Ω
      Relay terminal 2 - 3A-55 Always Below 1 Ω
      Relay terminal 5 - 3A-4 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      3A-15 - Body ground Always 10 kΩ or higher
      3A-55 - Body ground Always 10 kΩ or higher
      3A-4 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly Click here.

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

      A005K0JE02
      Text in Illustration
      *A for LHD *B for RHD
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      3A-15 - MB-13 (FFGO) Always Below 1 Ω
      3E-1 - 3A-4 Always Below 1 Ω
      3E-1 - 3A-55 Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      3A-15 - MB-13 (FFGO) Always Below 1 Ω
      3F-1 - 3A-4 Always Below 1 Ω
      3F-1 - 3A-55 Always 10 kΩ or higher

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

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      3A-55 - Battery negative (-) terminal

      Connect a positive (+) lead from the battery → 3E-1

      Connect a negative (-) lead from the battery → MB-14 (TRLY)

      		 11 to 14 V

      Not connect a positive (+) lead from the battery → 3E-1

      Not connect a negative (-) lead from the battery → MB-14 (TRLY)

      		 Below 1 V
      for RHD
      Tester Connection Condition Specified Condition
      3A-55 - Battery negative (-) terminal

      Connect a positive (+) lead from the battery → 3F-1

      Connect a negative (-) lead from the battery → MB-14 (TRLY)

      		 11 to 14 V

      Not connect a positive (+) lead from the battery → 3F-1

      Not connect a negative (-) lead from the battery → MB-14 (TRLY)

      		 Below 1 V

    OK

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

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here