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Home >> Lexus >> 2005 >> ES 330 >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Lighting System - Diagnosis) >> Front Fog Light Circuit >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Start the inspection from step 1 in the case of using the hand-held tester, and start from step  2 in the case of not using the hand-held tester.
  1. PERFORM ACTIVE TEST USING HAND-HELD TESTER 
    1. Connect the hand-held tester to DLC3.
    2. Turn the ignition switch ON and push the hand-held tester main switch ON.
    3. Select the item below in the ACTIVE TEST and then check that the relay operates.
      FRONT FOG LIGHT READY TEST DETAILS

      Item Test Details Diagnostic Note
      F FOG LIGHT RLY Turn Front fog light relay ON/OFF -
    1. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE  ) 
    2. NG: Go to next step. 
  2. INSPECT FOG LAMP RELAY 
    Fig 1: Inspecting Fog Lamp Ready Continuity
    G02933918Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Inspect fog lamp relay continuity.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Condition Tester connection Specified condition
      Always 1 - 2 Continuity
      Always 3 - 5 No continuity
      Apply B+ between the terminal 1 and 2 3 - 5 Continuity
    1. NG: REPLACE FOG LAMP RELAY 
    2. OK: Go to next step. 
  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSY 
    Fig 2: Identifying Instrument Panel Junction Block Assy Connectors
    G02933919Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure voltage between the terminal B8-7 of the multiplex network body ECU in the instrument panel junction block assy and body ground.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester connection Condition Specified condition
      B8-7 - Body ground Light control switch TAIL and Fog lamp switch ON Below 1 V
      B8-7 - Body ground Light control switch TAIL and Fog lamp switch ON 10 to 14 V
    1. NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE  ) 
    2. OK: Go to next step. 
  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSY 
    1. Measure voltage between each of the terminals as shown in the chart below.

      Standard: 

      TESTER CONNECTION SPECIFIED VOLTAGE

      Tester connection Condition Specified voltage
      1C-1 - Body ground Light control switch TAIL and front fog lamp switch is OFF Below 1 V --> 10 to 14 V
      1C-12 - Body ground Light control switch TAIL and front fog lamp switch is OFF Below 1 V --> 10 to 14 V
      1C-28 - Body ground Light control switch TAIL and front fog lamp switch is OFF 10 to 14 V --> Below 1 V
      Fig 3: Identifying Instrument Panel Junction Block Assy Front Side Connectors
      G02933920Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 4: Identifying Instrument Panel Junction Block Assy Back Side Connectors
      G02933921Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE  ) 
    2. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 
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