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. Contact an Authorized Subaru Dealership.

Wiring diagram:

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

Engine type: FA

Courtesy of SUBARU OF AMERICA, INC.
Engine type: EJ

Courtesy of SUBARU OF AMERICA, INC.

CHECK LAN SYSTEM .
Inspect 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 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
  
  (B572) No. 2 (+) - 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

(B572) No. 11 - 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
  
  (B572) No. 9 - Chassis ground:
Is resistance 74.15 - 460.88 Ω? (20°C)

Yes: Go to 6

No: Check IG relay 2. Go to 7
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
  
  (B574) No. 6 - Chassis ground:
Is resistance 50.87 - 72.17 Ω? (20°C)

Yes: Go to 8

No: Check IG relay 1. Go to 7
CHECK RELAY .
Perform unit inspection of IG relay 1 and IG relay 2. 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>IG Relay1 (Push Button Start)>REMOVAL . Ref. to SECURITY AND LOCKS>IG Relay2 (Push Button Start)>REMOVAL
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
  
  (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?

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