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Home >> Lexus >> 2009 >> LS 460L AWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication >> Can Communication System >> DTC U0209 Lost Communication with "Seat Control Module B" >> 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 POWER SEAT ECU AND SWITCH RH BRANCH WIRE) 
    1. Disconnect the e20 front power seat ECU and switch RH connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE REFERENCE

      Tester Connection Switch Condition Specified Condition
      e20-25 (CANP) - e20-24 (CANN) Engine switch off 54 to 69 Ω
      Fig 1: Identifying E20 Front Power Seat ECU And Switch Connector Terminals (RH)
      G06198522Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE FRONT POWER SEAT ECU AND SWITCH RH BRANCH WIRE OR CONNECTOR (CANP, CANN) 

      OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT ECU AND SWITCH RH - 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 e18 front power seat ECU and switch RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE REFERENCE

      Tester Connection Condition Specified Condition
      e18-6 (GND) - Body ground Always Below 1 Ω
    4. Measure the voltage according to the value(s) in the table below.
      Fig 2: Identifying E18 Front Power Seat ECU And Switch Connector Terminals (RH)
      G06198523Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      e18-7 (+B) - Body ground Always 11 to 14 V

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: REPLACE FRONT POWER SEAT ECU AND SWITCH RH  (See DISASSEMBLY )

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