DTC U0169: Lost Communication With Sunroof Control Module

DTC detecting condition:

Data does not arrive from sunroof unit.

Trouble symptom:

The sunroof does not operate normally.

Wiring diagram:

Sunroof control system Ref. to WIRING SYSTEM (IMPREZA MODEL)>SUNROOF CONTROL SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>SUNROOF CONTROL 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 U0169 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.
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 [Sunroof setting] equal to [Support]?

Yes: Go to 3.

No: Change the setting value to [Support].
CHECK DTC .
1. Turn the ignition switch to OFF.
2. Disconnect the sunroof unit connector and 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) (EXCEPT FOR HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .
Is DTC U0169 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.
CHECK HARNESS .
1. Turn the ignition switch to OFF.
2. Disconnect the sunroof unit connector and body integrated unit connector.
3. Using the tester, measure the resistance between terminals.
  Connector and terminal
  
  (R55) No. 7 - (i81) No. 18:
  
  (R55) No. 8 - Chassis ground:
Is the resistance less than 10 Ω?

Yes: Go to 5.

No: Repair the open circuit of harness.
CHECK HARNESS .
Using the tester, measure the resistance between terminals.

Connector and terminal

(R55) No. 7 - Chassis ground:

Is the resistance 10 kΩ or more?

Yes: Go to 6.

No: Repair the shorted portion of harness.
CHECK HARNESS .
1. Turn the ignition switch to ON.
2. Using the tester, measure the voltage between terminals.
  Connector and terminal
  
  (R55) No. 7 (+) - Chassis ground (-):
Is the voltage less than 1 V?

Yes: Go to 7.

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

Connector and terminal

(R55) No. 3 (+) - Chassis ground (-):

(R55) No. 6 (+) - Chassis ground (-):

Is the voltage 9 V or more?

Yes: Go to 8.

No: Repair the open circuit of harness.
CHECK CONTROL MODULE .
1. Turn the ignition switch to OFF.
2. Replace the sunroof unit with a properly functioning part. Ref. to SUNROOF/T-TOP/CONVERTIBLE TOP (SUNROOF)>SUNROOF MOTOR .
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 U0169 displayed? (Current malfunction)

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

No: Malfunction occurred in the sunroof unit.