Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b2508 prg motor circuit low

Subaru Legacy BN/BS (2015-2019) Service Manual / Power rear gate system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b2508 prg motor circuit low

DTC DETECTING CONDITION:

When the short to ground in motor circuit is detected.

TROUBLE SYMPTOM:

The power rear gate does not operate.

WIRING DIAGRAM:

Power rear gate system Power Rear Gate System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK AUTO OPERATION. 1) Turn the ignition switch to OFF. 2) Using operation switch, perform power rear gate auto open/close operation from full close position or full open position.	Is auto operation activated-	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.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2508 PRG MOTOR CIRCUIT LOW
2.CHECK DTC. 1) Turn the ignition switch to ON. 2) Using the Subaru Select Monitor, read DTC of PRG CM. Read Diagnostic Trouble Code (DTC)	Is DTC B2508 displayed- (Current malfunction)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2508 PRG MOTOR CIRCUIT LOW	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 (GROUND SHORT CIRCUIT). 1) Turn the ignition switch to OFF. 2) Disconnect the PRG CM connector in the order of (R423) > (R424). 3) Using a tester, measure the resistance between the PRG CM connector and chassis ground. Connector & terminal (R424) No. 3 — Chassis ground: (R424) No. 4 — Chassis ground:	Is the resistance 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2508 PRG MOTOR CIRCUIT LOW	Replace the PRG DU. Power Rear Gate Drive Unit
4.CHECK HARNESS (OPEN CIRCUIT). Using a tester, measure the resistance between the PRG CM connectors. Connector & terminal (R424) No. 3 — (R424) No. 4:	Is the resistance 0.1 - or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2508 PRG MOTOR CIRCUIT LOW	Replace the PRG DU. Power Rear Gate Drive Unit
5.CHECK CONNECTOR. Check the PRG CM connector (R424).	Is there poor contact of connector-	Repair or replace the poor contact of connector.	Replace the PRG CM. Power Rear Gate Control Module

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