DTC B2271: IGN Relay Control Circuit

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.

DTC detecting condition:

When the system judges the malfunction (difference between output value and monitoring result) 3 times continuously, during power supply status transition from ACC ON → ignition switch ON (initial check), or with 1-second interval check while the ignition switch is ON (periodical check).

Trouble symptom:

Not all functions operate at IGN ON.

Wiring diagram:

Keyless access with push button start system Ref. to WIRING SYSTEM>KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM>WIRING DIAGRAM
DC power supply circuit Ref. to WIRING SYSTEM>POWER SUPPLY CIRCUIT>WIRING DIAGRAM

Courtesy of SUBARU OF AMERICA, INC.

CAUTION:

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

CHECK LAN SYSTEM .
Perform the diagnosis for LAN system. Ref. 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. Ref. to WIRING SYSTEM>KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM>WIRING DIAGRAM

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 connector from the keyless access control module.
2. Using a tester, measure the voltage between the keyless access control module connector and chassis ground.
  Connector & terminal
  
  (i91) No. 1 (+) - Chassis ground (-):
  
  (i91) 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

(i92) No. 17 - Chassis ground:

(i91) 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 .
Using a tester, measure the resistance between the keyless access control module connector and chassis ground.

Connector & terminal

(i91) No. 27 - Chassis ground:

Is the resistance 74.15 - 460.88 Ω? (At 20°C)

Yes : Go to 6.

No : Check the IG 2 relay. Go to 7.
CHECK HARNESS .
Using a tester, measure the resistance between the keyless access control module connector and chassis ground.

Connector & terminal

(i91) No. 28 - Chassis ground:

Is the resistance 50.87 - 72.17 Ω? (At 20°C)

Yes : Go to 8.

No : Check the IG 1 relay. Go to 7.
CHECK RELAY .
Perform unit inspection of the IG 1 relay and IG 2 relay. Ref. to SECURITY AND LOCKS>RELAY AND FUSE>INSPECTION>CHECK RELAY

Is the check result OK?

Yes : Go to 8.

No : Replace the relay. Ref. to SECURITY AND LOCKS>RELAY AND FUSE
CHECK KEYLESS ACCESS CONTROL MODULE .
1. Connect the disconnected connectors.
2. Using a tester, measure the voltage between the keyless access control module connector and chassis ground.
  Connector & terminal
  
  (i91) No. 27 (+) - Chassis ground (-):
  
  (i91) No. 28 (+) - Chassis ground (-):
Does the voltage change as 1 V or less → 9.5 - 16 V according to the operation of ACC → IGN 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. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS CONTROL MODULE>REMOVAL