LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2009 >> LS 460L AWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Multiplex Communication >> Lin Communication System >> DTC B1492/92 Infrared Ray Sensor Communication Malfunction >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      SPECIFIED CONDITION CHART

      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
      Fig 1: Identifying X13 Infrared Ray Sensor Connector Terminal
      G06198336Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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) 

scientia non olet · About LEMON Manuals