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Home › Lexus › 2009 › LS 600hL › Repair and Diagnosis › External Pages › Different car › Section 15 (Air Conditioning) › Air Conditioning System › DTC B1469/69 Infrared Ray Sensor Circuit › Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT FUSE (D-IG1-3) 
    1. Remove the D-IG1-3 fuse from the driver side junction block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTOR SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      D-IG1-3 fuse Always Below 1 Ω

    NG: REPLACE FUSE 

    OK: Go to next step 

  2. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (IR SENSOR) 
    1. Use the Data List to check if the infrared rays sensors are functioning properly.
      1. Intelligent tester

        AIR CONDITIONER 

        DATA LIST

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        IR SENSOR 1 Infrared rays sensor 1 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)        		 Actual human body temperature is displayed Open in circuit 1°C (33 8°F)
        Short in circuit 50 5°C (122 9°F)
        IR SENSOR 2 Infrared rays sensor 2 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)
        IR SENSOR 3 Infrared rays sensor 3 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)
        IR SENSOR 4 Infrared rays sensor 4 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)
        IR SENSOR 5 Infrared rays sensor 5 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)
        IR SENSOR 6 Infrared rays sensor 6 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)
        IR SENSOR 7 Infrared rays sensor 7 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)
        IR SENSOR 8 Infrared rays sensor 8 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)
      2. Techstream

        Air Conditioner 

        DATA LIST

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        Infrared Rays Sensor 1 Infrared rays sensor 1 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)        		 Actual human body temperature is displayed Open in circuit 1°C (33 8°F)
        Short in circuit 50 5°C (122 9°F)
        Infrared Rays Sensor 2 Infrared rays sensor 2 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)
        Infrared Rays Sensor 3 Infrared rays sensor 3 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)
        Infrared Rays Sensor 4 Infrared rays sensor 4 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)
        Infrared Rays Sensor 5 Infrared rays sensor 5 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)
        Infrared Rays Sensor 6 Infrared rays sensor 6 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)
        Infrared Rays Sensor 7 Infrared rays sensor 7 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)
        Infrared Rays Sensor 8 Infrared rays sensor 8 Min 1°C (33 8°F)
        Max 50 5°C (122 9°F)

        OK: The display is as specified in the normal condition. 

    NG: Go to step 3 

    OK: REPLACE AIR CONDITIONING AMPLIFIER  (See REMOVAL  )

  3. CHECK HARNESS AND CONNECTOR (INFRARED RAY SENSOR - BODY GROUND AND BATTERY) 
    1. Disconnect the X13 infrared ray sensor connector
    2. Measure the resistance according to the value(s) in the table below

      Standard resistance 

      TESTER CONNECTOR SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      X13-1 (E) - Body ground Always 10 kΩ or higher
    3. Measure the voltage according to the value(s) in the table below

      Standard voltage 

      TESTER CONNECTOR SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      X13-5 (IG) - Body ground Power switch ON (IG) 11 to 14 V
      Power switch OFF Below 1 V
      Fig 1: Identifying Terminals Of X13 Infrared Ray Sensor Connector
      G04950445Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE INFRARED RAY SENSOR  (See REMOVAL  )

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