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CAN COMMUNICATION SYSTEM, Diagnostic DTC:U0208

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

DTC Code DTC Detection Condition Trouble Area
U0208 No communication from position control ECU continues.

  • Power source circuit of the position control ECU

  • Position control ECU branch wire or connector

  • Position control ECU and switch (Position control ECU)
A01CC7EE01
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

  • Turn the engine switch off before measuring the resistances of the CAN main wires and the CAN branch wires.

  • After the engine switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.

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

Tip:

  • Operating the engine 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 will help determine the cause of the malfunction.

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PROCEDURE


  1. Click here

    CHECK FOR DTC


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Check for DTCs (Click here).

      Tip:

      If the CAN MS bus communication DTC U1002 (Lost Communication with Gateway Module (Main body ECU)) is output, perform troubleshooting for U1002 and check for malfunctions in the CAN MS bus.

      Result
      Result Proceed to
      DTC U1002 is not output A
      DTC U1002 is output B

  2. Click here

    CHECK CAN BUS WIRE FOR DISCONNECTION (POSITION CONTROL ECU BRANCH WIRE)


    1. A01CD4YE41

      Turn the engine switch off.

      Table 1. Text in Illustration
      *A for RHD
      *B for LHD
      *a

      Front view of wire harness connector

      (to Position Control ECU)

    2. Disconnect the connector of the position control ECU.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      V16-7 (CANH) - V16-8 (CANL)*1 Engine switch off 54 to 69 Ω
      W17-7 (CANH) - W17-8 (CANL)*2 Engine switch off 54 to 69 Ω
      Tip:

      • *1: RHD

      • *2: LHD


  3. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. A01CG4JE17

      Disconnect the connector of the position control ECU.

      Table 2. Text in Illustration
      *A for RHD
      *B for LHD
      *a

      Front view of wire harness connector

      (to Position Control ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      V15-6 (+B) - Body ground*1 Always 11 to 14 V
      W17-6 (+B) - Body ground*2 Always 11 to 14 V
      Tip:

      • *1: RHD

      • *2: LHD


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    CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. A01CG4JE18

      Turn the engine switch off.

      Table 3. Text in Illustration
      *A for RHD
      *B for LHD
      *a

      Front view of wire harness connector

      (to Position Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V15-1 (GND) - Body ground*1 Always Below 1 Ω
      W16-1 (GND) - Body ground*2 Always Below 1 Ω
      Tip:

      • *1: RHD

      • *2: LHD


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    REPLACE POSITION CONTROL ECU AND SWITCH (POSITION CONTROL ECU)Click here

  6. Click here

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCSClick here

  7. Click here

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (POSITION CONTROL ECU BRANCH WIRE)

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

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    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)