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Home >> Lexus >> 2009 >> LS 460L AWD >> 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 CHART

    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 REFERENCE CHART

    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 Terminal
    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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