DTC U0208: Lost Communication With Seat Memory

DTC detecting condition:

No: data is received from power seat Control Module.

Trouble symptom:

The power seat may not operate normally.

Wiring diagram:

Power seat system Ref. to WIRING SYSTEM>POWER SEAT SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to BODY CONTROL (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

CHECK DTC .
1. Turn the ignition switch to ON.
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 code)

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.
CHECK BODY INTEGRATED UNIT CUSTOMIZATION .
Using Subaru Select Monitor, make sure the [Customize] setting values of [Body Control] correspond to the vehicle.

Is the setting value of [Seat Memory Setting] equal to [Exist]?

Yes: Go to 3.

No: Change the setting value to [ON].
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. Turn the ignition switch to ON.
5. 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 code)

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.
CHECK HARNESS (OPEN CIRCUIT) .
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
  
  (R502) No. 18 - (i81) No. 18:
  
  (R502) No. 10 - Chassis ground:
  
  (R504) No. 2 - Chassis ground:
Is the resistance less than 10 Ω?

Yes: Go to 5.

No: Repair the open circuit of harness.
CHECK HARNESS .
1. Turn the ignition switch to ON.
2. Using the tester, measure the voltage between terminals.
  Connector & terminal
  
  (R502) No. 18 (+) - Chassis ground (-):
Is the voltage less than 1 V?

Yes: Go to 6.

No: Repair the shorted portion of harness.
CHECK HARNESS .
Using the tester, measure the voltage between terminals.

Connector & terminal

(R502) No. 2 (+) - Chassis ground (-):

(R502) No. 8 (+) - Chassis ground (-):

Is the voltage 9 V or more?

Yes: Go to 7.

No: Repair the open circuit of harness.
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. Turn the ignition switch to ON.
4. 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 code)

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

No: Malfunction occurred in the power seat Control Module.