LIGHTING SYSTEM Rear Fog Light Circuit

DESCRIPTION

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

WIRING DIAGRAM

A005IKTE03

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 (REAR FOG LIGHT RELAY)


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

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

    B

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

    A

  2. 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

  3. 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.

      A005JIME02
      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
      3E-1 - 3D-3 Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      3F-1 - 3D-3 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
      3D-3 - Battery negative (-) terminal

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

      Connect a negative (-) lead from the battery → MB-14 (TRLY), MB-27 (RFGO)

      		 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), MB-27 (RFGO)

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

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

      Connect a negative (-) lead from the battery → MB-14 (TRLY), MB-27 (RFGO)

      		 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), MB-27 (RFGO)

      		 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