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Home >> Lexus >> 2007 >> ES 350 >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning >> Air Conditioning System >> LIN Communication Circuit >> Inspection Procedure

Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR (A/C CONTROL ASSEMBLY - AIR CONDITIONING AMPLIFIER) 
    1. Disconnect the connector from the A/C control assembly.
      Fig 1: Identifying A/C Control Assembly Connector Terminal
      G05251156Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the connector from the A/C amplifier.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      A/C CONTROL ASSEMBLY - AIR CONDITIONING AMPLIFIER RESISTANCE

      Tester Connection (Symbols) Condition Specified Condition
      E1-37 (LIN1) - E3-15 (TX1) Always Below 1 Ω
      E1-37 (LIN1) - Body ground Always 10 kΩ or higher
    Fig 2: Identifying A/C Amplifier Connector Terminal
    G05251157Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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