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Home › Lexus › 2008 › LS 460L › Repair and Diagnosis › Accessories & Equipment › Communication Devices › Multiplex Communication › Lin Communication System › DTC B1492/92: Infrared Ray Sensor Communication Malfunction › Inspection Procedure

Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR (INFRARED RAY SENSOR - AIR CONDITIONING AMPLIFIER) 
    1. Disconnect the X13 infrared ray sensor connector.
    2. Disconnect the L76 air conditioning amplifier connector.
      3. Fig 1: Identifying Terminals Of X13 Infrared Ray Sensor & L76 Air Conditioning Amplifier Connectors
      G04950451Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    TESTER CONNECTION SPECIFIED CONDITION TABLE

    Tester Connection Condition Specified Condition
    X13-3 (LIN) - L76-28 (LIN1) Always Below 1 Ω
    X13-3 (LIN) - Body ground Always 10 kΩ or higher
    L76-28 (LIN1) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  2. CHECK INFRARED RAY SENSOR (OPERATION) 
    1. Replace the infrared ray sensor with a new or normally functioning one (see INFRARED RAY SENSOR ).
    2. Operate the infrared ray sensor to check that it functions normally.

      OK: Infrared ray sensor function operates normally. 

    NG: REPLACE AIR CONDITIONING AMPLIFIER 

    OK: END (INFRARED RAY SENSOR IS FAULTY) 

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