DTC B2271: IGN Relay Control Circuit

DTC detecting condition:

When malfunction judgment (difference occurs between output value and monitoring result) continues 3 times at one second interval (periodical check) during transition of power supply status from ACC ON → IGN SW ON (initial check) or with IGN SW ON.

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 .

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 SYSTEM (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 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 and 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 and 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 .
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 and terminal
  
  (i91) No. 27 - Chassis ground:
Is the resistance 74.15 - 460.88 Ω? (At 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 and terminal
  
  (i91) No. 28 - Chassis ground:
Is the resistance 50.87 - 72.17 Ω? (At 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>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 and 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.