CAN COMMUNICATION SYSTEM(for LHD), 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 position control ECU assembly LH*1 or power seat switch assembly*2.

  • Position control ECU assembly LH*1 or power seat switch assembly*2 CAN branch wire or connector

  • Power source or inside of position control ECU assembly LH*1 or power seat switch assembly*2

  • Position control ECU assembly LH*1 or power seat switch assembly*2 ground circuit

  • Position control ECU assembly LH*1 or power seat switch assembly*2

WIRING DIAGRAM

B002BKBE22
B002BDPE36
for Standard Seat Type
*a No. 10 CAN Junction Connector
*b from Auxiliary Battery
*c P/SEAT1 F/L
*d Power Seat Switch Assembly

CAUTION / NOTICE / HINT

Note


  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output Click here.

  • Before measuring the resistance of the CAN bus, turn the power 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 (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

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

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

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the power switch on (IG) and wait at least approximately 20 seconds.

  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed Click here.

Tech Tips


  • Operating the power 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 SEAT TYPE


    1. Check the seat type.

      Result
      Result Proceed to
      except Standard Seat Type A
      for Standard Seat Type B

    B

    CHECK FOR OPEN IN CAN BUS WIRE (POWER SEAT SWITCH ASSEMBLY CAN BRANCH WIRE) Click here

    A

  3. CHECK FOR OPEN IN CAN BUS WIRE (POSITION CONTROL ECU ASSEMBLY LH CAN BRANCH WIRE)


    1. B002BW5E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Position Control ECU Assembly LH)

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

    2. Disconnect the position control ECU assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      d5-8 (CANP) - d5-9 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE POSITION CONTROL ECU ASSEMBLY LH CAN BRANCH WIRE OR CONNECTOR (CANP, CANN)

    OK

  4. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY LH - BATTERY AND BODY GROUND)


    1. B002BQOE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Position Control ECU Assembly LH)

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

      Note

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

    2. Disconnect the position control ECU assembly LH connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      d4-1 (+B2) - Body ground Power switch off 11 to 14 V
      d4-2 (+B) - Body ground Power switch off 11 to 14 V
      d5-18 (SYSB) - Body ground Power switch off 11 to 14 V
      d5-7 (IG) - Body ground Power switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      d5-2 (GND) - Body ground Always Below 1 Ω
      d5-1 (GND2) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK (for Sports Seat Type) A
      OK (for Luxury Seat Type) B
      NG C

    A

    REPLACE POSITION CONTROL ECU ASSEMBLY LH Click here

    B

    REPLACE POSITION CONTROL ECU ASSEMBLY LH Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. B002BQ1E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Seat Switch Assembly)

      Disconnect the cable from the negative (-) auxiliary 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
      d16-8 (CANP) - d16-7 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE POWER SEAT SWITCH ASSEMBLY CAN BRANCH WIRE OR CONNECTOR (CANP, CANN)

    OK

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


    1. B002B6IE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Seat Switch Assembly)

      Connect the cable to the negative (-) auxiliary 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 Switch Condition Specified Condition
      d15-7 (+B) - Body ground Power switch off 11 to 14 V
      d16-12 (SYSB) - Body ground Power switch off 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      d15-2 (GND) - Body ground Always Below 1 Ω

    OK

    REPLACE POWER SEAT SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR