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Home >> Lexus >> 2008 >> IS 250 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 cowl side junction block LH.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATIONS

      Tester Item Condition Specified Condition
      A/C fuse Always Below 1 Ω
    3. Fig 1: Identifying A/C Fuse
      G05831475Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE FUSE (A/C) 

    OK: Go to Next Step 

  2. INSPECT AIR CONDITIONING AMPLIFIER (AIR CONDITIONING AMPLIFIER - BODY GROUND) 
    1. Disconnect the A/C amplifier connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      J58-1 (B) - Body ground Always 10 to 14 V
    3. Fig 2: Identifying A/C Amplifier Connector
      G05831476Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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