CAN COMMUNICATION SYSTEM, Diagnostic DTC:U0208

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

DESCRIPTION

DTC No. DTC Detection Condition Trouble Area
U0208 No communication from the position control ECU and switch assembly continues.

  • Position control ECU and switch assembly branch line or connector

  • Power source circuit of position control ECU and switch assembly

  • Position control ECU and switch assembly

Tech Tips

This diagnosis procedure is for when DTC U0208 is output by the main body ECU (Intelligent tester display: Main Body).

WIRING DIAGRAM

A003Z5QE04
A003Z5QE07

INSPECTION PROCEDURE

Note


  • Turn the power switch off before measuring the resistances between CAN main bus lines and between CAN branch lines.

  • Turn the power switch off before inspecting CAN bus lines for a ground short.

  • After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

Tech Tips


  • Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • 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 Main Body of the main body ECU, this indicates a MS bus malfunction. Troubleshoot for DTC U1002 and check for malfunctions in the MS bus.

      Result
      Result Proceed to
      U1002 is not output from main body ECU (Intelligent tester display/Main Body) A
      U1002 is output from main body ECU (Intelligent tester display/Main Body) B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

  2. CHECK CAN BUS LINE FOR DISCONNECTION (POSITION CONTROL ECU AND SWITCH ASSEMBLY BRANCH LINE)


    1. Turn the power switch off.

    2. A003V5LE36
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Position Control ECU and Switch Assembly)
      *b for LHD
      *c for RHD

      Disconnect the position control ECU and switch assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Switch Condition Specified Condition
      X5-8 (CANP) - X5-7 (CANN) Power switch off 54 to 69 Ω
      for RHD
      Tester Connection Switch Condition Specified Condition
      W4-8 (CANP) - W4-7 (CANN) Power switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY)

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A003X71E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Position Control ECU and Switch Assembly)
      *b for LHD
      *c for RHD

      Disconnect the position control ECU and switch assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      X4-2 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      W3-2 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      X4-7 (+B) - Body ground Power switch off 11 to 14 V
      X5-12 (SYSB) - Body ground Power switch off 11 to 14 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      W3-7 (+B) - Body ground Power switch off 11 to 14 V
      W4-12 (SYSB) - Body ground Power switch off 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Click here