DTC B2271: IGN Relay Control Circuit

DTC detecting condition:

When malfunction (output value is different from the monitor result) judgment is generated three consecutive times at one-second intervals (periodic check), while the power supply status switches ACC ON → ignition switch ON (initial check), or during the ignition switch ON.

Trouble symptom:

Not all functions operate at IGN ON.

CAUTION:

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

Wiring diagram:

Push button start system. Refer 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.
Perform the diagnosis for LAN system. Refer 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. Refer 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
  
  (B573) No. 1 (+) - Chassis ground (-):
  
  (B573) 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

(B574) No. 17 - Chassis ground:

(B573) 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.
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
  
  (B573) No. 27 - 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
  
  (B573) No. 28 - 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. Refer to SECURITY AND LOCKS>RELAY AND FUSE>INSPECTION>CHECK RELAY .

Is the check result OK?

Yes: Go to 8.

No: Replace the relay. Refer to SECURITY AND LOCKS>RELAY AND FUSE .
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
  
  (B573) No. 27 (+) - Chassis ground (-):
  
  (B573) No. 28 (+) - 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. Refer to SECURITY AND LOCKS>KEYLESS ACCESS control module .