Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc u0230 lost communication with power rear gate control module

Subaru Legacy BN/BS (2015-2019) Service Manual / Body control system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc u0230 lost communication with power rear gate control module

DTC DETECTING CONDITION:

No data is received from the power rear gate CM.

TROUBLE SYMPTOM:

The power rear gate does not operate normally.

WIRING DIAGRAM:

NOTE:

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

Power rear gate system Power Rear Gate System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is DTC U0230 displayed- (Current malfunction)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0230 LOST COMMUNICATION WITH POWER REAR GATE 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 power rear gate CM connector and the body integrated unit connector, and then reconnect them. 3) Turn the ignition switch to ON. 4) Wait for 5 seconds. 5) Read the DTC. Read Diagnostic Trouble Code (DTC)	Is DTC U0230 displayed- (Current malfunction)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0230 LOST COMMUNICATION WITH POWER REAR GATE 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 ON. 2) Using the tester, measure the voltage between terminals. Connector & terminal (R422) No. 12 (+) — Chassis ground (−): (R423) No. 6 (+) — Chassis ground (−):	Is the voltage 9 V or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0230 LOST COMMUNICATION WITH POWER REAR GATE CONTROL MODULE	Repair the open circuit of harness.
4.CHECK HARNESS. 1) Turn the ignition switch to OFF. 2) Disconnect the power rear gate connector and the body integrated unit connector. 3) Using the tester, measure the resistance between terminals. Connector & terminal (R422) No. 10 — (i81) No. 18: (R423) No. 4 — Chassis ground:	Is the resistance less than 10 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0230 LOST COMMUNICATION WITH POWER REAR GATE CONTROL MODULE	Repair the open circuit of harness.
5.CHECK DTC. 1) Connect the power rear gate CM connector and the body integrated unit connector. 2) Turn the ignition switch to ON. 3) Wait for 5 seconds. 4) Read the DTC. Read Diagnostic Trouble Code (DTC)	Are DTCs U0230, U0231, U0208, U0169 displayed- (Current malfunction)	Replace the body integrated unit. Body Integrated Unit	Replace the power rear gate CM. Power Rear Gate Control Module

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