Interior Collation Does Not Function

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.

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

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.

Courtesy of SUBARU OF AMERICA, INC.

CAUTION:

When the 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. Ref. to SECURITY AND LOCKS>ACCESS KEY>REMOVAL
CHECK POWER SUPPLY CIRCUIT .
1. Turn the ignition switch to OFF.
2. Disconnect the keyless access control module connector.
3. Turn the ignition switch to ON.
4. Using a tester, measure the voltage between the keyless access control module connector and chassis ground.
  Connector & terminal
  
  (i91) No. 4 (+) - Chassis ground (-):
  
  (i91) 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. Connect the keyless access control module connector.
2. 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 (Collation)]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>WORK SUPPORT
  - Fr internal transmitter - internal tuner
3. Using a tester, check the output between keyless access control module connector terminals while performing [Keyless Access with Push Button Start Check].
  Connector & terminal
  
  (i92) No. 25 - (i92) 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>REMOVAL
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 (Collation)]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>WORK SUPPORT
  - 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 Check].
  Connector & terminal
  
  (i92) No. 9 - (i92) 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>REMOVAL
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 (Collation)]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>WORK SUPPORT
  - 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 Check].
  Connector & terminal
  
  (i92) No. 2 - (i92) 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>REMOVAL
CHECK HARNESS (OPEN CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from the keyless access control module.
3. Disconnect the connector from the front interior antenna.
4. Using a tester, measure the resistance between the front interior antenna connector and the keyless access control module connector.
  Connector & terminal
  
  (i92) No. 25 - (C35) No. 1:
  
  (i92) No. 12 - (C35) No. 3:
Is the resistance less than 10 Ω?

Yes : Go to 7.

No : Repair or replace the open circuit of harness.
CHECK HARNESS (OPEN CIRCUIT) .
1. Disconnect the connector from the center interior antenna.
2. Using a tester, measure the resistance between the center interior antenna connector and the keyless access control module connector.
  Connector & terminal
  
  (i92) No. 9 - (R114) No. 1:
  
  (i92) No. 3 - (R114) No. 3:
Is the resistance less than 10 Ω?

Yes : Go to 8.

No : Repair or replace the open circuit of harness.
CHECK HARNESS (OPEN CIRCUIT) .
1. Disconnect the rear interior antenna connector.
2. Using a tester, measure the resistance between the rear interior antenna connector and the keyless access control module connector.
  Connector & terminal
  
  (i92) No. 2 - (R115) No. 1:
  
  (i92) No. 1 - (R115) No. 3:
Is the resistance less than 10 Ω?

Yes : Go to 9.

No : Repair or replace the open circuit of harness.
CHECK ANTENNA .
1. Connect the keyless access control module connector.
2. Replace the front interior antenna with a new or properly functioning part. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS INDOOR ANTENNA>REMOVAL
Does it operate properly?

Yes : Replace the front interior antenna.

No : Go to 10.
CHECK ANTENNA .
Replace the center interior antenna with a new or properly functioning part. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS INDOOR ANTENNA>REMOVAL

Does it operate properly?

Yes : Replace the center interior antenna.

No : Go to 11.
CHECK ANTENNA .
Replace the rear interior antenna with a new or properly functioning part. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS INDOOR ANTENNA>REMOVAL

Does it operate properly?

Yes : Replace the rear interior antenna.

No : Go to 12.
CHECK KEYLESS ACCESS SYSTEM CHECK .
1. Turn the ignition switch to ON.
2. 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 (Collation)]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>WORK SUPPORT
  - Fr internal transmitter - internal tuner
3. 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>REMOVAL
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 (Collation)]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>WORK SUPPORT
  - 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>REMOVAL
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 (Collation)]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>WORK SUPPORT
  - Trunk-internal transmitter - trunk-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>REMOVAL