CAN COMMUNICATION SYSTEM, Diagnostic DTC:U0208

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

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

U0208

Lost Communication with "Seat Control Module A"

There is no communication from the front power seat switch LH.

  • Power source or inside front power seat switch LH

  • Front power seat switch LH branch wire or connector

  • Front power seat switch LH

Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

C263735E01

INSPECTION PROCEDURE

Note:

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

Tip:

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

PROCEDURE

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note:

      • After turning the engine 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

      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

        Click here

      Result

      Result

      NEXT
    NEXT

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

    1. C219233C01

      *a

      Rear view of wire harness connector

      (to Front Power Seat Switch LH)

      Disconnect the b5 front power seat switch LH connector.

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

      Standard Resistance

      Tester Connection

      Switch Condition

      Specified Condition

      b5-8 (CANP) - b5-7 (CANN)

      Engine switch off

      54 to 69 Ω

      Resul

      Result

      OK

      NG
    NG

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

    OK

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

    1. C219234C02

      *a

      Rear view of wire harness connector

      (to Front Power Seat Switch LH)

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

      Note:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

      Click here

    2. Disconnect the b4 front power seat switch LH connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      b4-2 (GND1) - Body ground

      Always

      Below 1 Ω

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      b4-7 (+B1) - Body ground

      Always

      11 to 14 V

      b5-12 (SYSB) - Body ground

      Always

      11 to 14 V

      Resul

      Result

      OK

      NG
    OK

    REPLACE FRONT POWER SEAT SWITCH LH

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR