Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b2276 acc relay off signal

Subaru Legacy BN/BS (2015-2019) Service Manual / Keyless access with push button start system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b2276 acc relay off signal

DTC DETECTING CONDITION:

When input error occurs in accessory relay cut input signal of keyless access CM.

TROUBLE SYMPTOM:

• The accessory power supply is not cut during engine start.

• Starter rotation is slow.

CAUTION:

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

WIRING DIAGRAM:

NOTE:

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

Keyless access with push button start system Keyless Access With Push Button Start 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 B2276 ACC RELAY OFF SIGNAL	Perform the inspection according to the diagnosis for LAN system.
2.CHECK HARNESS. 1) Disconnect the keyless access CM connector and ECM connector. 2) Using a tester, measure the resistance between the keyless access CM connector and ECM. Connector & terminal (i241) No. 36 — (B134) No. 64:	Is the resistance less than 1 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2276 ACC RELAY OFF SIGNAL	Repair or replace the open circuit of harness.
3.CHECK HARNESS. Using a tester, measure the resistance between the keyless access CM connector and chassis ground. Connector & terminal (i241) No. 36 — Chassis ground:	Is the resistance 10 k- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2276 ACC RELAY OFF SIGNAL	Repair or replace the short circuit of the harness.
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 B2276 ACC RELAY OFF SIGNAL	Repair or replace the open circuit of harness.
5.CHECK KEYLESS ACCESS CM. 1) Connect the keyless access CM connector and ECM connector. 2) Place the access key in the passenger room. 3) Using a tester, measure the voltage between terminals of the keyless access CM connector when the push button ignition switch is pressed while depressing the brake pedal, with the shift lever in the P range for model except for MT or while depressing the clutch pedal for MT model. Connector & terminal (i241) No. 36 (+) — (i241) No. 21 (−):	Is the voltage 9.5 — 16 V > 1 V or less-	Replace the keyless access CM. Keyless Access CM	Replace the ECM. Engine Control Module (ECM) > REMOVAL Engine Control Module (ECM) > REMOVAL

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Charge
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