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Front Fog Light Circuit: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: 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 → See step   2 

    OK → See step   6 

  2. REPLACE INTEGRATION RELAY 
    1. Temporarily replace the integration relay with a new or normally functioning one.

    NEXT: Go to next step 

  3. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: 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 → See step   4 

    OK → END (INTEGRATION RELAY WAS DEFECTIVE) 

  4. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Remove the integration relay from the engine room relay block.
    2. Disconnect the 2F instrument panel junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1C-26 (FFG) - 2F-40 Always Below 1 Ω
      2F-40 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly.
      Fig 1: Inspecting Instrument Panel Junction Block Assembly
      GTY296299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2F-40 - 2I-13 (FFGO) Always Below 1 Ω
      2F-40 - Body ground Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)

    NG → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    OK → See step   7 

  6. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  7. REPLACE MAIN BODY ECU. Refer to  REMOVAL 
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