Access Key Lockout Protection Function In The Trunk Does Not Operate

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:

Malfunction of door lock control system
Malfunction of harness between the body integrated unit and trunk lid lock actuator
Trunk lid lock actuator malfunction
Body integrated unit malfunction
Access key malfunction
Keyless access control module malfunction
Malfunction of harness between interior rear antenna and keyless access control module
Interior rear antenna malfunction

Wiring diagram:

Door lock control system Ref. to WIRING SYSTEM>DOOR LOCK CONTROL SYSTEM>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:

Inspect LAN system according to the basic diagnostic procedure, and make sure that there is no fault.
Check that the keyless access function is not stopped.
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 TRUNK OPENER SWITCH .
Check that the trunk opens with the driver's seat trunk opener switch.

Does it open normally?

Yes : Go to 2.

No : Check the door lock circuit. Ref. to SECURITY AND LOCKS>DOOR LOCK CONTROL SYSTEM>INSPECTION
CHECK KEYLESS OPERATION .
Check that the trunk opens when the trunk opener button of the access key is operated.

Does it open normally?

Yes : Go to 7.

No : Go to 3.
CHECK TRUNK UNLOCK OPERATION .
1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor, check the following items in the [Active Test] of [Body Control]. Ref. to BODY CONTROL (DIAGNOSTICS)>ACTIVE TEST
  - R gate/trunk UNLOCK output
3. Check that the trunk opens when [R gate/trunk UNLOCK output] is output.
Does it open normally?

Yes : Go to 7.

No : Go to 4.
CHECK HARNESS (OPEN CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from F/B.
3. Disconnect the connector from the trunk lid lock actuator.
4. Measure the resistance between the F/B connector and trunk lid lock actuator connector.
  Connector & terminal
  
  (i4) No. 7 - (Td47) No. 1:
Is the resistance less than 10 Ω?

Yes : Go to 5.

No : Repair or replace the open circuit of harness.
CHECK HARNESS (OPEN CIRCUIT) .
Measure the resistance between the trunk lid lock actuator connector and chassis ground.

Connector & terminal

(Td47) No. 2 - Chassis ground:

Is the resistance less than 10 Ω?

Yes : Go to 6.

No : Repair or replace the open circuit of harness.
CHECK TRUNK LID LOCK ACTUATOR .
Check the trunk lid lock actuator. Ref. to SECURITY AND LOCKS>TRUNK LID LATCH AND ACTUATOR ASSEMBLY>INSPECTION

Is the check result OK?

Yes : Replace the body integrated unit. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT>REMOVAL

No : Replace the trunk lid latch & actuator assembly. Ref. to SECURITY AND LOCKS>TRUNK LID LATCH AND ACTUATOR ASSEMBLY>REMOVAL
CHECK ACCESS KEY .
1. Prepare all access keys registered to the vehicle.
2. Check that the trunk opens with each access key.
Does it open normally?

Yes : Go to 8.

No : Replace the access key. Ref. to SECURITY AND LOCKS>ACCESS KEY>REPLACEMENT
CHECK HARNESS (OPEN CIRCUIT) .
1. Disconnect the interior rear antenna connector and the keyless access control module connector.
2. Using a tester, measure the resistance between the interior rear antenna connector and keyless access control module connector.
  Connector & terminal
  
  (R115) No. 1 - (i92) No. 2:
  
  (R115) No. 3 - (i92) No. 1:
Is the resistance less than 10 Ω?

Yes : Go to 9.

No : Repair or replace the open circuit of harness.
CHECK HARNESS (GROUND SHORT CIRCUIT) .
Using a tester, measure the resistance between the keyless access control module connector and chassis ground.

Connector & terminal

(i92) No. 2 - Chassis ground:

(i92) No. 1 - Chassis ground:

Is the resistance 10 kΩ or more?

Yes : Go to 10.

No : Repair or replace the short circuit of the harness.
CHECK PASSENGER ROOM REAR ANTENNA .
Replace the passenger room rear antenna with a new or properly functioning part. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS INDOOR ANTENNA>REMOVAL

Does it operate properly?

Yes : The passenger room rear antenna has a failure.

No : Go to 11.
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
  - Trunk-internal transmitter - trunk-internal tuner
3. Hold the access key 1 m or more away from the trunk opener button, and then come closer to within 0.8 m.
Does the outside 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