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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication >> Can Communication System >> DTC U0235 Lost Communication with Cruise Control Front Distance Range Sensor >> Inspection Procedure

Inspection Procedure

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
      CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
      NOTE:
      • After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected (see INITIALIZATION ).
  2. CHECK FOR OPEN IN CAN BUS WIRE (FRONT MILLIMETER WAVE RADAR SENSOR MAIN WIRE) 
    1. Disconnect the B9 front millimeter wave radar sensor connector.
      Fig 1: Identifying Terminals Of B9 Front Millimeter Wave Radar Sensor Connector
      G04953447Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      B9-4 (CA1P) - B9-3 (CA1N) Engine switch off 108 to 132 Ω

    NG: REPAIR OR REPLACE FRONT MILLIMETER WAVE RADAR SENSOR MAIN WIRE OR CONNECTOR (CA1P, CA1N) 

    OK: GO TO NEXT STEP 

  3. CHECK HARNESS AND CONNECTOR (FRONT MILLIMETER WAVE RADAR SENSOR BATTERY AND BODY GROUND) 
    1. Connect the cable to the negative (-) battery terminal.
      NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (see INITIALIZATION ).
    2. Disconnect the B9 front millimeter wave radar sensor connector.
      Fig 2: Identifying Terminals Of B9 Front Millimeter Wave Radar Sensor Connector
      G04953448Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      B9-1 (LGND) - Body ground Always Below 1 Ω
      B9-2 (SGND) - Body ground Always Below 1 Ω
    4. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      B9-5 (IGB) - Body ground Engine switch on (IG) 11 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE FRONT MILLIMETER WAVE RADAR SENSOR  (See REMOVAL )

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