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Home › Lexus › 2008 › LS 460L › 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 passenger side junction block.
    2. Measure the resistance of the fuse.

      Standard Resistance 

      RESISTANCE REFERENCE

      Tester Connection Condition Specified Condition
      A/C fuse Always Below 1 Ω

    NG: REPLACE FUSE 

    OK: Go to next step. 

  2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY) 
    1. Disconnect the L76 air conditioning amplifier connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard Voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      L76-6 (+B1) - Body ground Always 11 to 14 V
      L76-7 (+B2) - Body ground Always 11 to 14 V
      Fig 1: Identifying L76 Air Conditioning Amplifier Connector Terminals
      G04950497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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