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Home >> Subaru >> 2017 >> Outback 2.5i >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Security And Locks - Keyless Access (W/Push Button Start) (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC B2274: Acc Relay Control Circuit

DTC B2274: Acc Relay Control Circuit

DTC detecting condition: 

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

Trouble symptom: 

Each function does not operate at the ACC position.

CAUTION: For replacement procedure of keyless access Control Module, 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 Ref. to WIRING DIAGRAM , Stop Light System.

Fig 1: ACC Relay Control Wiring Diagram
G10277427Courtesy of SUBARU OF AMERICA, INC.
Step Check Yes No
1 CHECK LAN SYSTEM. 
Inspect LAN system. Ref. to PROCEDURE , Basic Diagnostic Procedure.		 Is the check result OK? Go to step 2  Perform the inspection according to the diagnosis for LAN system.
2 CHECK FUSE. 
Check the fuse. Ref. to RELAY AND FUSE		 Is the check result OK? Go to step 3  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 Control Module connector.
  2. Using a tester, measure the resistance between the keyless access Control Module connector and chassis ground.

    Connector & terminal 

    (i75) No. 24 (+) - Chassis ground (-): 

    (i241) No. 40 (+) - Chassis ground (-): 

 Is the voltage 9.5 - 16 V? Go to step 4  Check the power supply circuit.
4 CHECK HARNESS (OPEN CIRCUIT). 
Using a tester, measure the resistance between the keyless access Control Module connector and chassis ground.
Connector & terminal 
(i241) No. 21 - Chassis ground: 
(i75) No. 1 - Chassis ground: 		 Is the resistance less than 1 Ω? Go to step 5  Repair or replace the open circuit of harness.
5 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 

    (i75) No. 23 - Chassis ground: 

 Is resistance 152.61 - 216.5 Ω? (20°C) Go to step 7  Go to step 6 
6 CHECK RELAY. 
Perform inspection of ACC relay unit. Ref. to RELAY AND FUSE		 Is the check result OK? Go to step 7  Replace the relay.
7 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 
(i75) No. 23 - (i137) No. 2: 
(i136) No. 6 - Chassis ground: 		 Is the resistance less than 1 Ω? Go to step 8  Repair or replace the open circuit of harness.
8 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 

    (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 Control Module. Ref. to KEYLESS ACCESS CONTROL MODULE
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