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Home >> Lexus >> 2007 >> GS 450h >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning >> Air Conditioning System >> Back-up Power Source Circuit >> Inspection Procedure

Inspection Procedure

  1. INSPECT FUSE (A/C) 
    1. Remove the A/C fuse from the main body ECU LH.
    2. Measure the resistance of the fuse.

      Standard resistance: 

      Below 1 Ω 

    NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE 

    OK: GO TO Next Step 

  2. CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BATTERY) 
    1. Disconnect the K52 A/C amplifier connector.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Specified Condition
      K52-1 (B) - Body ground 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 1: Identifying K52 A/C Amplifier Connector
    G05306901Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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