DTC B2276: ACC Relay Off Signal

DTC detecting condition:

When ACC cutoff input ON ("L" level) continued for 40 seconds, when the ignition switch is turned ON.

Trouble symptom:

The accessory power supply is not cut during engine start.
Starter rotation is slow.

CAUTION:

For replacement procedure of keyless access control module and ECM, refer to the "REGISTRATION INSTRUCTIONS FOR IMMOBILIZER" provided as a separate volume.
Before performing diagnosis, refer to "CAUTION" in "General Description". Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

Wiring diagram:

Push button start system. Refer to WIRING SYSTEM>PUSH BUTTON START SYSTEM>WIRING DIAGRAM .

Engine type: FA

Courtesy of SUBARU OF AMERICA, INC.
Engine type: EJ

Courtesy of SUBARU OF AMERICA, INC.

CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. Refer to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

Is the check result OK?

Yes: Go to 2.

No: Perform the inspection according to the diagnosis for LAN system.
CHECK HARNESS (OPEN CIRCUIT).
1. Disconnect the keyless access control module connector and ECM connector.
2. Using a tester, measure the resistance between the keyless access control module connector and ECM.
  Connector & terminal
  
  Engine type: FA
  
  (B573) No. 19 - (B134) No. 2:
  
  Engine type: EJ
  
  (B573) No. 19 - (B135) No. 32:
  
  Is the resistance less than 1 Ω?
  
  Yes: Go to 3.
  
  No: Repair or replace the open circuit of harness.
CHECK HARNESS (GROUND SHORT CIRCUIT).
Using a tester, measure the resistance between the keyless access control module connector and chassis ground.

Connector & terminal

(B573) No. 19 - Chassis ground:

Is the resistance 10 kΩ or more?

Yes: Go to 4.

No: Repair or replace the short circuit of the harness.
CHECK HARNESS (OPEN CIRCUIT).
Using a tester, measure the resistance between the keyless access control module connector and chassis ground.

Connector & terminal

(B574) No. 17 - Chassis ground:

(B573) No. 20 - Chassis ground:

Is the resistance less than 1 Ω?

Yes: Go to 5.

No: Repair or replace the open circuit of harness.
CHECK KEYLESS ACCESS control module.
1. Connect the keyless access control module 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 control module connector when the push button ignition switch is pressed, while depressing the brake pedal with the shift lever in the "P" range (for CVT model) or while depressing the clutch pedal (for MT model).
  Connector & terminal
  
  (B573) No. 19 (+) - (B573) No. 20 (-):
  
  Is the voltage 9.5 - 16 V → 1 V or less?
  
  Yes: Replace the keyless access control module. Refer to SECURITY AND LOCKS>KEYLESS ACCESS control module .
  
  No: Replace the ECM. Refer to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>ENGINE control module (ECM) . Refer to FUEL INJECTION (FUEL SYSTEMS) (STI)>ENGINE control module (ECM) .