CAN COMMUNICATION SYSTEM(for RHD without Central Gateway ECU), Diagnostic DTC:U0208

DTC Code DTC Name
U0208 Lost Communication with "Seat Control Module A"

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U0208 There is no communication from the power seat switch assembly.

  • Power seat switch assembly CAN branch wire or connector

  • Power source or inside of power seat switch assembly

  • Power seat switch assembly ground circuit

  • Power seat switch assembly

WIRING DIAGRAM

B001VWUE08

CAUTION / NOTICE / HINT

Note


  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips


  • Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. RECONFIRM DTC OUTPUT


    1. Reconfirm DTCs.

      Tech Tips

      If DTC U1002 is output from Gateway 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 sub bus 1.

      Result
      Result Proceed to
      DTC U1002 is not output from main body ECU (multiplex network body ECU). A
      DTC U1002 is output from main body ECU (multiplex network body ECU). B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

  2. CHECK FOR OPEN IN CAN BUS WIRE (POWER SEAT SWITCH ASSEMBLY CAN BRANCH WIRE)


    1. B001VZYE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Seat Switch Assembly)

      Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the power seat switch assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      c47-8 (MPX1) - c47-7 (MPX2) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO POWER SEAT SWITCH ASSEMBLY (MPX1, MPX2)

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SEAT SWITCH ASSEMBLY - BATTERY AND BODY GROUND)


    1. B001ZJ2E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Seat Switch Assembly)

      Connect the cable to the negative (-) battery terminal.

      Note

      When connecting the cable, some systems need to be initialized after the cable is reconnected Click here.

    2. Disconnect the power seat switch assembly connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      c46-6 (+B2) - Body ground Always 11 to 14 V
      c47-12 (SYSB) - Body ground Always 11 to 14 V

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      c46-1 (GND) - Body ground Always Below 1 Ω

    OK

    REPLACE POWER SEAT SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR