Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b2274 acc relay control circuit

Subaru Legacy BN/BS (2015-2019) Service Manual / Keyless access with push button start system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b2274 acc relay control circuit

DTC DETECTING CONDITION:

When malfunction is detected in ACC relay drive circuit in the keyless access CM or external circuit.

TROUBLE SYMPTOM:

Each function does not operate at the ACC position.

CAUTION:

For replacement procedure of keyless access CM, refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.

WIRING DIAGRAM:

NOTE:

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

Stop light system Stop Light System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK LAN SYSTEM. Inspect LAN system. Basic Diagnostic Procedure > PROCEDURE	Is LAN system normal-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT	Perform the inspection according to the diagnosis for LAN system.
2.CHECK FUSE. Remove the fuse. Relay and Fuse > INSPECTION	Is the fuse OK-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT	Replace the fuse. When the replaced fuse is blown immediately, check the power supply circuit for short-circuited.
3.CHECK HARNESS. 1) Disconnect the keyless access CM connector. 2) Using a tester, measure the resistance between the keyless access CM connector and chassis ground. Connector & terminal (i75) No. 24 (+) — Chassis ground (−): (i241) No. 40 (+) — Chassis ground (−):	Is the voltage 9.5 — 16 V-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT	Check the power supply circuit.
4.CHECK HARNESS. Using a tester, measure the resistance between the keyless access CM connector and chassis ground. Connector & terminal (i241) No. 21 — Chassis ground: (i75) No. 1 — Chassis ground:	Is the resistance less than 1 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT	Repair or replace the open circuit of harness.
5.CHECK HARNESS. 1) Disconnect the keyless access CM connector. 2) Using a tester, measure the resistance between the keyless access CM connector and chassis ground. Connector & terminal (i75) No. 23 — Chassis ground:	Is resistance 152.61 — 216.5 -- (20°C)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT
6.CHECK RELAY. Perform inspection of ACC relay unit. Relay and Fuse	Is the relay OK-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT	Replace the relay.
7.CHECK HARNESS. Using a tester, measure the resistance between keyless access CM connectors. Connector & terminal (i75) No. 23 — (i137) No. 2: (i136) No. 6 — Chassis ground:	Is the resistance less than 1 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2274 ACC RELAY CONTROL CIRCUIT	Repair or replace the open circuit of harness.
8.CHECK KEYLESS ACCESS CM. 1) Connect the keyless access CM connector. 2) Using a tester, measure the voltage between keyless access CM connectors. Connector & terminal (i75) No. 23 (+) — Chassis ground (−):	Is the voltage 1 V or less > 9.5 — 16 V when OFF > ACC ON-	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.	Replace the keyless access CM. Keyless Access CM

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