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Home >> Lexus >> 2009 >> LS 600hL >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Multiplex Communication) >> Lin Communication System >> Rain Sensor LIN Communication Malfunction >> 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.
NOTE: When using the Intelligent tester or Techstream with the power switch OFF to troubleshoot:
Connect the Intelligent tester 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 USING Intelligent TESTER OR TECHSTREAM (LIN COMMUNICATION) 
    1. Using the Intelligent tester or Techstream, read the "Data List"
      1. Intelligent tester

        BODY No.5 (Front Controller): 

        ITEM RANGE REFERENCE

        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): 

    ITEM RANGE REFERENCE

    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:  Go to step  2

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

  2. CHECK HARNESS AND CONNECTOR (FRONT CONTROLLER - RAIN SENSOR) 
    Fig 1: Identifying Front Controller Connector A50 And Rain Sensor Connector X8
    G05787114Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A50 controller connector.
    2. Disconnect the X8 sensor connector.
    3. Measure the resistance and voltage according to the value(s) in the table below.

    Standard resistance 

    RESISTANCE REFERENCE

    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 

    VOLTAGE SPECIFICATION

    Tester Connection Condition Specified Condition
    A50-9 (LIN) or X8-3 (MPX) - Body ground Always Below 1 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

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

    Standard resistance 

    RESISTANCE REFERENCE

    Tester Connection Condition Specified Condition
    X8-1 (ES) - Body ground Always Below 1 Ω
    Fig 2: Identifying Rain Sensor Connector X8
    G04947023Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard voltage 

    VOLTAGE SPECIFICATION

    Tester Connection Switch Condition Specified Condition
    X8-4 (SIG) - Body ground Power switch OFF Below 1 V
    X8-4 (SIG) - Body ground Power switch ON (IG) 11 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

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

      BODY No.5 (Front Controller): 

      ITEM RANGE REFERENCE

      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 ram sensor / OK or Stop OK Connection
      Stop No connection      		 -
    2. Techstream

    Body No.5 (Front Controller): 

    ITEM RANGE REFERENCE

    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 MULTIPLEX NETWORK FRONT LIGHT ECU (FRONT CONTROLLER) 

    OK: END (RAIN SENSOR IS DEFECTIVE) 

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