DTC B2271: IGN Relay Control Circuit

DTC detecting condition:

When malfunction is detected in IG1 and IG2 drive circuits in the keyless access Control Module.
When malfunction is detected in IG hold circuit in the keyless access Control Module.

Trouble symptom:

Not all functions operate at IGN ON.

CAUTION: For replacement procedure of keyless access Control Module, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.

Wiring diagram:

Push button start system Ref. to WIRING DIAGRAM , Push Button Start System.

Fig 1: IGN Relay Control Circuit - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK LAN SYSTEM. Inspect LAN system. Ref. to Basic Diagnostic 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. Check the fuse. Ref. to 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 voltage between the keyless access Control Module connector and chassis ground. Connector & terminal (B572) No. 2 (+) - 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 (B572) No. 11 - 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 (B572) No. 9 - Chassis ground:	Is resistance 74.15 - 460.88 Ω? (20°C)	Go to step 6 .	Check IG relay 2. Go to step 7 .
6 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 (B574) No. 6 - Chassis ground:	Is resistance 50.87 - 72.17 Ω? (20°C)	Go to step 8 .	Check IG relay 1. Go to step 7 .
7 CHECK RELAY. Perform unit inspection of IG relay 1 and IG relay 2. Ref. to CHECK RELAY , INSPECTION, Relay and Fuse.	Is the relay OK?	Go to step 8 .	Replace the relay. Ref. to REMOVAL , IG Relay1 (Push Button Start). Ref. to REMOVAL , IG Relay2 (Push Button Start).
8 CHECK KEYLESS ACCESS CONTROL MODULE. Connect the keyless access Control Module connector. Using a tester, measure the voltage between the terminals of keyless access Control Module connector. Connector & terminal (B574) No. 6 (+) - Chassis ground (-): (B572) No. 9 (+) - Chassis ground (-):	Is the voltage 1 V or less → 9.5 - 16 V when ACC → IGN 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 REMOVAL , Keyless Access Control Module.