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Inspection Procedure

WARNING: This page is about a different car, the 2002 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. DO ACTIVE TEST OF OBD II SCAN TOOL OR LEXUS HAND-HELD TESTER 
    1. Connect the LEXUS hand-held tester to the DLC3.
    2. Check the front fog using ACTIVE LIST.

    Front Controller: 

    FRONT CONTROLLER INSPECTION

    Description Tester display Check condition
    Front fog light F FOG LIGHT RLY ON - OFF
    1. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOM TABLE, SEE  PROBLEM SYMPTOMS TABLE  . 
    2. NG: GO TO NEXT STEP 
  2. INSPECT MULTIPLEX NETWORK FRONT LAMP ECU 
    1. Turn the ignition switch OFF.
    2. Disconnect the front light ECU connector.
    3. Measure voltage between terminal FFOG and GND.

      OK: 

      Voltage: 10 - 14 V 

    1. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOM TABLE, see  PROBLEM SYMPTOMS TABLE  . 
    2. NG: GO TO NEXT STEP 
  3. CHECK HARNESS AND CONNECTOR 
    1. Check for open and short circuit in harness and connector between terminal FFOG-RLY of front light ECU and front fog light.
    2. Check for open and short circuit in harness and connector between front fog light and body ground.
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOM TABLE, SEE  PROBLEM SYMPTOMS TABLE  . 
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