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Home >> Lexus >> 2007 >> GS 450h >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Lighting >> Lighting System >> AFS ECU Power Source Circuit >> Inspection Procedure
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Inspection Procedure

  1. CHECK AFS ECU 
    1. Measure the voltage of the connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      A29-1 (E1) - A29-2 (IG) Power switch OFF Below 1 V
      A29-1 (E1) - A29-2 (IG) Power switch ON (IG) 10 to 14 V
      Fig 1: Identifying AFS ECU Connector Terminals
      G05315673Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    NG: GO TO Next Step 

  2. CHECK WIRE HARNESS (ECU - BODY GROUND) 
    1. Disconnect the A29 ECU connector.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      A29-1 (E1) - Body ground Below 1 Ω
      Fig 2: Identifying A29 ECU Connector Terminals
      G05315674Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO Next Step 

  3. CHECK WIRE HARNESS (ECU - BATTERY) 
    1. Disconnect the A29 connector.
    2. Measure the voltage of the connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      A29-2 (IG) - A29-1 (E1) Power switch ON (IG) 10 to 14 V
      Fig 3: Identifying A29 Connector Terminals
      G05315675Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE AFS ECU 

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