DTC B2274 Acc Relay Control Circuit: Wiring Diagram

WARNING: This page is about a different car, the 2016 Subaru Outback and 2016 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: For the coupling connector, refer to "WIRING SYSTEM".
Stop light system < Ref. to appropriate wiring diagram in SYSTEM WIRING DIAGRAM article. >

Fig 1: ACC Relay Control - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTICS PROCEDURE

Step	Check	Yes	No
1 CHECK LAN SYSTEM. Inspect LAN system. < Ref. to PROCEDURE , Basic Diagnostic Procedure. >	Is LAN system normal?	Go to step 2 .	Perform the inspection according to the diagnosis for LAN system.
2 CHECK FUSE. Remove the fuse. < Ref. to INSPECTION , Relay and Fuse. >	Is the fuse 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. Disconnect the keyless access control module connector. 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. 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. Disconnect the keyless access control module connector. 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 relay OK?	Go to step 7 .	Replace the relay.
7 CHECK HARNESS. Using a tester, measure the resistance between keyless access control module connectors. 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. Connect the keyless access control module connector. Using a tester, measure the voltage between keyless access control module 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 control module. < Ref. to KEYLESS ACCESS CONTROL MODULE . >