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Home >> Toyota >> 2016 >> Avalon XLE >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System (W/O Central Gateway Ecu) - Diagnostic Codes & Circuit Tests - (Except Hybrid) >> CAN COMMUNICATION SYSTEM (W/O Central Gateway ECU) >> DTC U0208: Lost Communication with "Seat Control Module A" [10/2014 - ] >> Procedure

DTC U0208: Lost Communication with "Seat Control Module A" [10/2014 - ]: Procedure

  1. RECONFIRM DTC OUTPUT 
    1. Reconfirm DTCs.

      HINT: 

      If DTC U1002 is output from Main Body of the main body ECU (multiplex network body ECU), this indicates a sub bus 1 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in the sub bus 1.

      Result

      Result Proceed to
      U1002 is not output from main body ECU (multiplex network body ECU) (Techstream display: Main Body) A
      U1002 is output from main body ECU (multiplex network body ECU) (Techstream display: Main Body) B

    B 

    Refer to DTC U1002: Lost Communication with Gateway Module (Main Body ECU) [10/2014 - ] )

    A 

    See step  2

  2. CHECK FOR OPEN IN SUB BUS 1 LINES (FRONT POWER SEAT SWITCH LH BRANCH LINE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the S9 front power seat switch LH connector.
      GTY589594Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Front Power Seat Switch LH)
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      S9-8 (CANP) - S9-7 (CANN) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

    NG 

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (FRONT POWER SEAT SWITCH LH) 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Disconnect the S8 front power seat switch LH connector.
      GTY590074Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Front Power Seat Switch LH)
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      S8-2 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
    3. Reconnect the cable to the negative (-) battery terminal.
    4. Measure the voltage according to the value (s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      S8-7 (+B) - Body ground Always 11 to 14 V
      S9-12 (SYSB) - Body ground Always 11 to 14 V

    OK 

    REPLACE FRONT POWER SEAT SWITCH LH 

    Refer to REMOVAL [10/2014 - ] )

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

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