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 Refer to WIRING SYSTEM>Keyless Access With Push Button Start System>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. 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.

2. 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.

3. 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 

   (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.

4. 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.

5. 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 

   (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.

6. 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 

   (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.

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 .

8. 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 

   (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.