Trouble causes

Access key battery malfunction
Malfunction of keyless access Control Module power supply circuit
Malfunction of harness between keyless access Control Module and each interior antenna
Interior antenna malfunction

CAUTION:

When the access key or keyless access Control Module is replaced, registration of the immobilizer is required. For the relevant procedures, 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 ACCESS KEY .
Check the battery of the access key. Ref. to SECURITY AND LOCKS>ACCESS KEY>INSPECTION .

Is the check result OK?

Yes : Go to 2 .

No : Replace the battery.
CHECK POWER SUPPLY CIRCUIT .
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
  
  (i75) No. 4 (+) - Chassis ground (-):
  
  (i75) No. 1 (+) - Chassis ground (-):
  
  Is the voltage 9.5 - 16 V?
  
  Yes : Go to 3 .
  
  No : Check the power supply circuit.
CHECK INTERIOR ANTENNA (FRONT) .
1. Using the Subaru Select Monitor, check the following items in the [Keyless Access with Push Button Start Check] of [Keyless Access with Push Button Start]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>KEYLESS ACCESS WITH PUSH BUTTON START CHECK .
  - Fr internal transmitter - internal tuner
2. Using a tester, check the output between keyless access Control Module connector terminals while performing [Keyless Access with Push Button Start].
  Connector & terminal
  
  (i241) No. 25 - (i241) No. 12:
  
  Is a pulse output?
  
  Yes : Go to 4 .
  
  No : Replace the keyless access Control Module. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS CONTROL MODULE .
CHECK INTERIOR ANTENNA (CENTER) .
1. Using the Subaru Select Monitor, check the following items in the [Keyless Access with Push Button Start Check] of [Keyless Access with Push Button Start]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>KEYLESS ACCESS WITH PUSH BUTTON START CHECK .
  - Rr internal transmitter - internal tuner
2. Using a tester, check the output between keyless access Control Module connector terminals while performing [Keyless Access with Push Button Start].
  Connector & terminal
  
  (i241) No. 9 - (i241) No. 3:
  
  Is a pulse output?
  
  Yes : Go to 5 .
  
  No : Replace the keyless access Control Module. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS CONTROL MODULE .
CHECK INTERIOR ANTENNA (REAR) .
1. Using the Subaru Select Monitor, check the following items in the [Keyless Access with Push Button Start Check] of [Keyless Access with Push Button Start]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>KEYLESS ACCESS WITH PUSH BUTTON START CHECK .
  - R gate internal transmitter - internal tuner
2. Using a tester, check the output between keyless access Control Module connector terminals while performing [Keyless Access with Push Button Start].
  Connector & terminal
  
  (i241) No. 2 - (i241) No. 1:
  
  Is a pulse output?
  
  Yes : Go to 6 .
  
  No : Replace the keyless access Control Module. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS CONTROL MODULE .
CHECK HARNESS (OPEN CIRCUIT) .
1. Disconnect the front interior antenna connector and the keyless access Control Module connector.
2. Using a tester, check continuity between the front interior antenna connector and the keyless access Control Module connector.
  Connector & terminal
  
  (i241) No. 25 - (i71) No. 1:
  
  (i241) No. 12 - (i71) No. 3:
  
  Is there continuity?
  
  Yes : Go to 7 .
  
  No : Repair or replace the open circuit of harness.
CHECK HARNESS (OPEN CIRCUIT) .
1. Disconnect the center interior antenna connector and the keyless access Control Module connector.
2. Using a tester, check continuity between the center interior antenna connector and the keyless access Control Module connector.
  Connector & terminal
  
  (i241) No. 9 - (R297) No. 1:
  
  (i241) No. 3 - (R297) No. 3:
  
  Is there continuity?
  
  Yes : Go to 8 .
  
  No : Repair or replace the open circuit of harness.
CHECK HARNESS (OPEN CIRCUIT) .
1. Disconnect the rear interior antenna connector and the keyless access Control Module connector.
2. Using a tester, check continuity between the rear interior antenna connector and the keyless access Control Module connector.
  Connector & terminal
  
  (i241) No. 2 - (R298) No. 1:
  
  (i241) No. 1 - (R298) No. 3:
  
  Is there continuity?
  
  Yes : Go to 9 .
  
  No : Repair or replace the open circuit of harness.
CHECK ANTENNA .
Replace the front interior antenna with a new or properly functioning part.

Does it operate properly?

Yes : Replace the front interior antenna. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS INDOOR ANTENNA>REMOVAL .

No : Go to 10 .
CHECK ANTENNA .
Replace the center interior antenna with a new or properly functioning part.

Does it operate properly?

Yes : Replace the center interior antenna. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS INDOOR ANTENNA>REMOVAL .

No : Go to 11 .
CHECK ANTENNA .
Replace the rear interior antenna with a new or properly functioning part.

Does it operate properly?

Yes : Replace the rear interior antenna. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS INDOOR ANTENNA>REMOVAL .

No : Go to 12 .
CHECK KEYLESS ACCESS SYSTEM CHECK .
1. Using the Subaru Select Monitor, check the following items in the [Keyless Access with Push Button Start Check] of [Keyless Access with Push Button Start]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>KEYLESS ACCESS WITH PUSH BUTTON START CHECK .
  - Fr internal transmitter - internal tuner
2. Hold the access key 1 m or more away from the center console, then come closer to within 0.8 m.
  Does the buzzer sound?
  
  Yes : Go to 13 .
  
  No : Replace the keyless access Control Module. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS CONTROL MODULE .
CHECK KEYLESS ACCESS SYSTEM CHECK .
1. Using the Subaru Select Monitor, check the following items in the [Keyless Access with Push Button Start Check] of [Keyless Access with Push Button Start]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>KEYLESS ACCESS WITH PUSH BUTTON START CHECK .
  - Rr internal transmitter - internal tuner
2. Hold the access key 1 m or more away from the center of the second-row seats, then come closer to within 0.8 m.
  Does the buzzer sound?
  
  Yes : Go to 14 .
  
  No : Replace the keyless access Control Module. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS CONTROL MODULE .
CHECK KEYLESS ACCESS SYSTEM CHECK .
1. Using the Subaru Select Monitor, check the following items in the [Keyless Access with Push Button Start Check] of [Keyless Access with Push Button Start]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>KEYLESS ACCESS WITH PUSH BUTTON START CHECK .
  - R gate internal transmitter - internal tuner
2. Hold the access key 1 m or more away from the back of the rear seat, then come closer to within 0.8 m.
  Does the buzzer sound?
  
  Yes : 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 .