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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Multiplex Communication >> Lin Communication System >> Rain Sensor LIN Communication Malfunction >> Inspection Procedure

Inspection Procedure

NOTE: When using the intelligent tester (with CAN VIM) or Techstream with the engine switch off to troubleshoot:
Connect the intelligent tester (with CAN VIM) or Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the tester and vehicle begins.
  1. READ VALUE OF INTELLIGENT TESTER OR TECHSTREAM (LIN COMMUNICATION) 
    1. Using the intelligent tester, read the "Data List".
      1. Intelligent tester

        BODY No. 5 (Front Controller): 

        INTELLIGENT TESTER BODY NO. 5 (FRONT CONTROLLER)

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        LIN COM Status of LIN communication / Without or With Without: No connection
        With: Connection        		 -
        CURR COMM RAIN Current communication with rain sensor / OK or Stop OK: Connection
        Stop: No connection        		 -
      2. Techstream

        Body No. 5 (Front Controller): 

        TECHSTREAM BODY NO. 5 (FRONT CONTROLLER)

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        LIN Communication Status of LIN communication / Without or With Without: No connection
        With: Connection        		 -
        Curr Comm Rain Sensor Current communication with rain sensor / OK or Stop OK: Connection
        Stop: No connection        		 -

        OK: Tester displays "With" or "OK". 

    OK: USE SIMULATION METHOD TO CHECK  (See HOW TO PROCEED WITH TROUBLESHOOTING )

    NG: GO TO NEXT STEP 

  2. CHECK HARNESS AND CONNECTOR (FRONT LIGHT ECU - RAIN SENSOR) 
    1. Disconnect the A50 ECU connector.
    2. Disconnect the X8 sensor connector.
    3. Measure the resistance and voltage according to the value(s) in the table below.

      Standard resistance 

      FRONT LIGHT ECU - RAIN SENSOR RESISTANCE

      Tester Connection Condition Specified Condition
      A50-9 (LIN) - X8-3 (MPX) Always Below 1 Ω
      A50-9 (LIN) or X8-3 (MPX) - Body ground Always 10 kΩ or higher

      Standard voltage 

      FRONT LIGHT ECU - RAIN SENSOR VOLTAGE

      Tester Connection Condition Specified Condition
      A50-9 (LIN) or X8-3 (MPX) - Body ground Always Below 1 V
      Fig 1: Identifying A50 ECU And X8 Sensor Connectors
      G04947022Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: CHECK RAIN SENSOR (BATTERY VOLTAGE AND GROUND) 

  3. CHECK RAIN SENSOR (BATTERY VOLTAGE AND GROUND) 
    1. Disconnect the X8 sensor connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.

      Standard resistance 

      RAIN SENSOR (BATTERY VOLTAGE AND GROUND) RESISTANCE

      Tester Connection Condition Specified Condition
      X8-1 (ES) - Body ground Always Below 1 Ω

      Standard voltage 

      RAIN SENSOR (BATTERY VOLTAGE AND GROUND) VOLTAGE

      Tester Connection Switch Condition Specified Condition
      X8-4 (SIG) - Body ground Engine Switch off Below 1 V
      X8-4 (SIG) - Body ground Engine Switch on (IG) 11 to 14 V
      Fig 2: Identifying X8 Sensor Connector
      G04947023Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  4. REPLACE RAIN SENSOR 
    1. Temporarily replace the rain sensor with a new or normally functioning one (see REMOVAL ).
  5. READ VALUE OF INTELLIGENT TESTER OR TECHSTREAM (LIN COMMUNICATION) 
    1. Using the intelligent tester, read the "Data List".
      1. Intelligent tester

        BODY No. 5 (Front Controller): 

        INTELLIGENT TESTER BODY NO. 5 (FRONT CONTROLLER)

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        LIN COM Status of LIN communication / Without or With Without: No connection
        With: Connection        		 -
        CURR COMM RAIN Current communication with rain sensor / OK or Stop OK: Connection
        Stop: No connection        		 -
      2. Techstream

        Body No. 5 (Front Controller): 

        TECHSTREAM BODY NO. 5 (FRONT CONTROLLER)

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        LIN Communication Status of LIN communication / Without or With Without: No connection
        With: Connection        		 -
        Curr Comm Rain Sensor Current communication with rain sensor / OK or Stop OK: Connection
        Stop: No connection        		 -

        OK: Tester displays "With" or "OK". 

    NG: REPLACE FRONT LIGHT ECU 

    OK: END (RAIN SENSOR IS DEFECTIVE) 

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