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Home >> Subaru >> 2022 >> Ascent Touring >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Body Control System (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC U0208: Lost Communication With Seat Memory

DTC U0208: Lost Communication With Seat Memory

DTC detecting condition: 

No data is received from power seat control module.

Trouble symptom: 

The power seat does not operate normally.

Wiring diagram: 

Power seat system Ref. to WIRING SYSTEM>Power Seat System>WIRING DIAGRAM .

G13203432Courtesy of SUBARU OF AMERICA, INC.
CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to BODY CONTROL (DIAGNOSTICS)>General Description>CAUTION .
  1. CHECK DTC  .

    Read the DTC of [Body Control] using the Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

    Is DTC U0208 displayed? (Current malfunction)

    Yes  : Go to  2.

    No  : Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

    NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
  2. CHECK CONTROL MODULE  .

    Using Subaru Select Monitor, confirm that the customization items of [Body Control] correspond to the vehicle. Ref. to BODY CONTROL (DIAGNOSTICS)>CUSTOMIZE .

    Is the customization item [Seat Memory Setting] set to [Exist]?

    Yes  : Go to  3.

    No  : Set the customization item corresponding to the vehicle.

  3. CHECK DTC  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the power seat control module connector and the body integrated unit connector.
    3. Connect the disconnected connectors.
    4. Read the DTC of the LAN system using the Subaru Select Monitor. Ref. to LAN SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is DTC U0208 displayed? (Current malfunction)

    Yes  : Go to  4.

    No  : Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

    NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
  4. CHECK HARNESS  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the power seat control module connector and the body integrated unit connector.
    3. Using the tester, measure the resistance between terminals.

      Connector & terminal 

      (R155) No. 12 - (i81) No. 18:

      (R156) No. 12 - Chassis ground:

      (R156) No. 14 - Chassis ground:

    Is the resistance less than 10 Ω?

    Yes  : Go to  5.

    No  : Repair the open circuit of harness.

  5. CHECK HARNESS  .
    1. Disconnect the power rear gate control module connector. (With power rear gate)
    2. Disconnect the sunroof unit connector. (With sunroof)
    3. Disconnect the rain sensor connector. (With auto wiper)
    4. Using the tester, measure the resistance between terminals.

      Connector & terminal 

      (R155) No. 12 - Chassis ground:

    Is the resistance 10 kΩ or more?

    Yes  : Go to  6.

    No  : Repair the shorted portion of harness.

  6. CHECK HARNESS  .
    1. Turn the ignition switch to ON.
    2. Using the tester, measure the voltage between terminals.

      Connector & terminal 

      (R155) No. 12 (+) - Chassis ground (-):

    Is the voltage less than 1 V?

    Yes  : Go to  7.

    No  : Repair the shorted portion of harness.

  7. CHECK HARNESS  .
    1. Turn the ignition switch to ON.
    2. Using the tester, measure the voltage between terminals.

      Connector & terminal 

      (R155) No. 10 (+) - Chassis ground (-):

      (R155) No. 11 (+) - Chassis ground (-):

      (R156) No. 3 (+) - Chassis ground (-):

      (R156) No. 8 (+) - Chassis ground (-):

    Is the voltage 9 V or more?

    Yes  : Go to  8.

    No  : Repair the open circuit of harness.

  8. CHECK CONTROL MODULE  .
    1. Turn the ignition switch to OFF.
    2. Replace the power seat control module with a properly functioning part. Ref. to SEATS>Power Seat System>REMOVAL .
    3. Read the DTC of [Body Control] using the Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

    Is DTC U0208 displayed? (Current malfunction)

    Yes  : Replace the body integrated unit. Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .

    No  : For model without power rear gate, sunroof or auto wiper, malfunction occurred in the power seat control module. For models with power rear gate, sunroof or auto wiper. Go to  9.

  9. CHECK CONTROL MODULE  .
    NOTE: For models without power rear gate, Go to  10.
    1. Connect the power rear gate control module connector.
    2. Read the DTC of [Body Control] using the Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

    Is DTC U0208 displayed? (Current malfunction)

    Yes  : Replace the power rear gate control module. Ref. to POWER REAR GATE SYSTEM>POWER REAR GATE CONTROL MODULE .

    No  : Go to  10.

  10. CHECK CONTROL MODULE  .
    NOTE: For models without sunroof. Go to  11.
    1. Connect the sunroof unit connector.
    2. Read the DTC of [Body Control] using the Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

    Is DTC U0208 displayed? (Current malfunction)

    Yes  : Replace the sunroof unit. Ref. to SUNROOF/T-TOP/CONVERTIBLE TOP (SUNROOF)>SUNROOF CONTROL SYSTEM .

    No  : Go to  11.

  11. CHECK RAIN SENSOR  .
    1. Connect the rain sensor connector.
    2. Read the DTC of [Body Control] using the Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

    Is DTC U0208 displayed? (Current malfunction)

    Yes  : Replace the rain sensor. Ref. to GLASS/WINDOWS/MIRRORS>RAIN SENSOR .

    No  : Malfunction occurred in the power seat control module.

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