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Home >> Lexus >> 2016 >> ES 300h >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System (W/O Central Gateway Ecu) (Diagnostic Codes & Symptom Tests) >> Can Communication System (W/O Central Gateway Ecu) >> DTC U0208: Lost Communication with "Seat Control Module A" (2016 - 2017) >> Procedure

DTC U0208: Lost Communication with "Seat Control Module A" (2016 - 2017): 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

    Result:  B

    B 

    Go To Diagnosis Procedure Indicated By Output DTC 

    (efer to DTC U1002: Lost Communication with Gateway Module (Main Body ECU) (2016 - 2017) )

    Result:  A

    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 (-) auxiliary battery terminal.
    2. Disconnect the X10 front power seat switch LH connector.
      GTY655215Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      X10-8 (CANP) - X10-7 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Front Power Seat Switch LH)

    Result:  NG

    NG 

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

    Result:  OK

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Disconnect the X9 front power seat switch LH connector.
      GTY631948Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      X9-2 (GND) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
    3. Reconnect the cable to the negative (-) auxiliary battery terminal.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      X9-7 (+B) - Body ground Power switch off 11 to 14 V
      X10-12 (SYSB) - Body ground Power switch off 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Front Power Seat Switch LH)

    Result:  OK

    OK 

    REPLACE FRONT POWER SEAT SWITCH LH 

    (efer to REMOVAL (2016 - 2017) )

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

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