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Home >> Lexus >> 2007 >> GS 430 >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Lighting >> System Description >> Front Fog Light Circuit >> Inspection Procedure

Inspection Procedure

  1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER 
    1. Select the item below in the ACTIVE TEST, use the intelligent tester to generate a control command, and then check that the fog light illuminates.

      Engine room No. 2 relay block 

      ACTIVE TEST DETAIL - ENGINE ROOM NO 2 RELAY BLOCK

      Item Test Details Diagnostic Note
      F FOG LIGHT RLY Front fog light relay ON / OFF -

      OK: 

      Fog light illuminates. 

    NG: Go to step 2 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

  2. INSPECT FUSE (FR FOG, FR CTRL-AM) 
    1. Remove the FR CTRL-AM fuse from the engine room No. 2 relay block.
    2. Remove the FR FOG fuse from the engine room No. 2 junction block.
    3. Measure the resistance of the fuses.

      Standard resistance: 

      Below 1 Ω 

    NG: REPLACE FUSE 

    OK: Go to next step 

  3. REPLACE FOG LIGHT BULB (FRONT RH OR FRONT LH) 
    1. Temporarily replace the fog light bulb with a new or normally functioning one.
    2. Check that the bulb illuminates.

      OK: 

      Fog light bulb illuminates. 

    OK: END 

    NG: Go to next step 

  4. CHECK WIRE HARNESS (ENGINE ROOM NO. 2 JUNCTION BLOCK - BATTERY) 
    1. Disconnect the 2E junction block connector.
    2. Measure the resistance of the wire harness side connector.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Specified Condition
      2E-1 - Body ground 10 to 14 V
    Fig 1: Checking Wire Harness (Engine Room No. 2 Junction Block - Battery)
    G05298818Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  5. CHECK WIRE HARNESS (ENGINE ROOM NO. 2 JUNCTION BLOCK - FOG LIGHT (FRONT LH OR FRONT RH) - BODY GROUND) 
    1. Check the wire harness between the fog light (front LH) and engine room No. 2 junction block, and the fog light (front LH) and body ground.
      1. Disconnect the 2G junction block connector.
      2. Disconnect the B12 fog light connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance 

        RESISTANCE SPECIFICATION

        Tester Connection Specified Condition
        2G-7 - B12-2 Below 1 Ω
        2G-7 or B12-2 - Body ground 10 kΩ or higher
        B12-1 - Body ground Below 1 Ω
      Fig 2: Identifying Engine Room No. 2 Junction Block - Fog Light (Front LH) Connector Terminals
      G05298819Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the wire harness between the fog light (front RH) and engine room No. 2 junction block, and the fog light (front RH) and body ground.
      1. Disconnect the 2G junction block connector.
      2. Disconnect the B1 fog light connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance 

        RESISTANCE SPECIFICATION

        Tester Connection Specified Condition
        2G-6 - B1-2 Below 1 Ω
        2G-6 or B1-2 - Body ground 10 kΩ or higher
        B1-1 - Body ground Below 1 Ω
    Fig 3: Identifying Fog Light (Front RH) And Engine Room No. 2 Junction Block Connector Terminals
    G05298820Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

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