DTC U0169: Lost Communication With Sunroof Control Module

DTC detecting condition: 

No data is received from sunroof unit.

Trouble symptom: 

The sunroof does not operate normally.

Wiring diagram: 

Sunroof Control System Ref. to WIRING SYSTEM>Sunroof Control System>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC  .

   Read the DTC of body integrated unit using Subaru Select Monitor. Ref. BODY CONTROL SYSTEM (DIAGNOSTICS)>Read 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.
2. 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. Read the DTC of the CAN system using the Subaru Select Monitor. Ref. BODY CONTROL SYSTEM (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) .

   Is DTC U0169 displayed? (Current malfunction)

   Yes: Go to  3.

   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.
3. CHECK HARNESS  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the sunroof unit and body integrated unit connector.
   3. Using the tester, measure the resistance between terminals.

      Connector & terminal

      (R125) No. 11 - (i81) No. 18:

      (R125) No. 12 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes: Go to  4.

   No: Repair the open circuit of harness.

4. CHECK HARNESS  .
   1. Disconnect the power rear gate Control Module connector. (With power rear gate)
   2. Disconnect the power seat Control Module connector. (With power seat (with memory))
   3. Using the tester, measure the resistance between terminals.

      Connector & terminal

      (R125) No. 11 - Chassis ground:

   Is the resistance 10 kΩ or more?

   Yes: Go to  5.

   No: Repair the shorted portion of harness.

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

      Connector & terminal

      (R125) No. 11 (+) - Chassis ground (-):

   Is the voltage less than 1 V?

   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

      (R125) No. 1 (+) - Chassis ground (-):

      (R125) No. 8 (+) - Chassis ground (-):

   Is the voltage 9 V or more?

   Yes: Go to  7.

   No: Repair the open circuit of harness.

7. 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. Read the DTC of body integrated unit using Subaru Select Monitor. Ref. BODY CONTROL SYSTEM (DIAGNOSTICS)>Read 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: For model without power rear gate and without power seat (with memory), malfunction occurred in the sunroof unit. For models with power rear gate or with power seat (with memory), Go to  8.

8. CHECK CONTROL MODULE  .
   NOTE: For models without power rear gate, Go to  9.
   1. Connect the power rear gate Control Module connector.
   2. Read the DTC of body integrated unit using Subaru Select Monitor. Ref. BODY CONTROL SYSTEM (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) .

   Is DTC U0169 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  9.

9. CHECK CONTROL MODULE  .
   1. Connect the power seat Control Module connector.
   2. Read the DTC of body integrated unit using Subaru Select Monitor. Ref. BODY CONTROL SYSTEM (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) .

   Is DTC U0170 displayed? (Current malfunction)

   Yes: Replace the power seat Control Module. Ref. to SEATS>Power Seat System>REMOVAL>POWER SEAT CONTROL MODULE (SEAT WITH MEMORY FUNCTION) .

   No: Malfunction occurred in the sunroof unit.