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Headlight Leveling ECU Power Source Circuit: Procedure

  1. INSPECT FUSE (H-LP LVL) 
    1. Remove the H-LP LVL fuse from the cowl side junction block RH.
    2. Measure the resistance of the fuse.

      Standard resistance

      Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  2. CHECK WIRE HARNESS (HEADLIGHT BEAM LEVEL CONTROL ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the A43 ECU connector.
      Fig 1: Identifying A43 ECU Connector
      GTY103339Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance of the wire harness side connector.

      Standard voltage

      Tester Connection Condition Specified Condition
      A43-14 (IG) - A43-1 (E1) Engine switch on (IG) 10 to 14 V

      Standard resistance

      Tester Connection Specified Condition
      A43-1 (E1) - Body ground Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

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

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