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Subaru Legacy Service Manual: 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:

NOTE:

For the coupling connector, refer to “WIRING SYSTEM”.

Sunroof Control System Sunroof Control System > WIRING DIAGRAM

STEPCHECKYESNO

1.CHECK DTC.

Read the DTC of body integrated unit using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)

Is DTC U0169 displayed- (Current malfunction)

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0169 LOST COMMUNICATION WITH SUNROOF CONTROL MODULE

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. Read Diagnostic Trouble Code (DTC)

Is DTC U0169 displayed- (Current malfunction)

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0169 LOST COMMUNICATION WITH SUNROOF CONTROL MODULE

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 --

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0169 LOST COMMUNICATION WITH SUNROOF CONTROL MODULE

Repair the open circuit of harness.

4.CHECK HARNESS.

1) Disconnect the power rear gate CM connector. (With power rear gate)

2) Disconnect the power seat CM 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 k- or more-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0169 LOST COMMUNICATION WITH SUNROOF CONTROL MODULE

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-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0169 LOST COMMUNICATION WITH SUNROOF CONTROL MODULE

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-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0169 LOST COMMUNICATION WITH SUNROOF CONTROL MODULE

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. Sunroof Motor

3) Read the DTC of body integrated unit using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)

Is DTC U0169 displayed- (Current malfunction)

Replace the body integrated unit. Body Integrated Unit

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), Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0169 LOST COMMUNICATION WITH SUNROOF CONTROL MODULE

8.CHECK CONTROL MODULE.

NOTE:

For models without power rear gate, Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0169 LOST COMMUNICATION WITH SUNROOF CONTROL MODULE

1) Connect the power rear gate CM connector.

2) Read the DTC of body integrated unit using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)

Is DTC U0169 displayed- (Current malfunction)

Replace the power rear gate CM. Power Rear Gate Control Module

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0169 LOST COMMUNICATION WITH SUNROOF CONTROL MODULE

9.CHECK CONTROL MODULE.

1) Connect the power seat CM connector.

2) Read the DTC of body integrated unit using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)

Is DTC U0170 displayed- (Current malfunction)

Replace the power seat CM. Power Seat System > REMOVAL

Malfunction occurred in the sunroof unit.

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Other materials:

Removal
1. Disconnect the ground terminal from the battery sensor, and wait for at least 60 seconds before starting work. NOTE2. Remove the cover assembly - instrument panel LWR driver. Instrument Panel Lower Cover > REMOVAL3. Remove the panel - knee guard.4. Disconnect the body integrated unit (fuse & re ...

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