DTC B2274: ACC Relay Control Circuit

DTC detecting condition:

When any of the following is established.

ACC output ON and the output circuit monitor result OFF simultaneously continued for 10 seconds.
The starter output OFF, the output circuit monitor result ON, and the remote engine starter not controlling simultaneously continued for 10 seconds.

Trouble symptom:

Each function does not operate at the ACC position.

CAUTION:

For replacement procedure of keyless access control module, 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 .
Stop light system. Refer to WIRING SYSTEM>STOP LIGHT 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 FUSE.
Check the fuse. Refer to SECURITY AND LOCKS>RELAY AND FUSE .

Is the check result OK?

Yes: Go to 3.

No: Replace the fuse. When the replaced fuse is blown immediately, check the power supply circuit for short-circuited.
CHECK HARNESS.
1. Disconnect the keyless access control module connector.
2. Using a tester, measure the voltage between the keyless access control module connector and chassis ground.
  Connector & terminal
  
  (B573) No. 1 (+) - Chassis ground (-):
  
  (B573) No. 4 (+) - Chassis ground (-):
  
  Is the voltage 9.5 - 16 V?
  
  Yes: Go to 4.
  
  No: Check the power supply circuit.
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 HARNESS.
1. Disconnect the keyless access control module connector.
2. Using a tester, measure the resistance between the keyless access control module connector and chassis ground.
  Connector & terminal
  
  (B573) No. 16 - Chassis ground:
  
  Is resistance 152.61 - 216.5 Ω? (20°C)
  
  Yes: Go to 7.
  
  No: Go to 6.
CHECK RELAY.
Perform inspection of ACC relay unit. Refer to SECURITY AND LOCKS>RELAY AND FUSE .

Is the check result OK?

Yes: Go to 7.

No: Replace the relay.
CHECK HARNESS (OPEN CIRCUIT).
Using a tester, measure the resistance between the keyless access control module connector and the accessory relay (push button start), and between the accessory relay (push button start) and chassis ground.

Connector & terminal

(B573) No. 16 - (B426) No. 1:

(B426) No. 2 - Chassis ground:

Is the resistance less than 1 Ω?

Yes: Go to 8.

No: Repair or replace the open circuit of harness.
CHECK KEYLESS ACCESS control module.
1. Connect the keyless access control module connector.
2. Using a tester, measure the voltage between the keyless access control module connector and chassis ground.
  Connector & terminal
  
  (B573) No. 16 (+) - Chassis ground (-):
  
  Is the voltage 1 V or less → 9.5 - 16 V when OFF → ACC ON?
  
  Yes: 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.
  
  No: Replace the keyless access control module. Refer to SECURITY AND LOCKS>KEYLESS ACCESS control module .