The Steering Lock 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:

Door switch circuit malfunction
P range switch circuit malfunction.
Steering lock circuit malfunction
Steering lock control module malfunction
Keyless access control module 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.

CAUTION:

For replacement procedure of keyless access control module or steering lock 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 (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION

CHECK DTC .
1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor, read the DTCs of [Keyless Access with Push Button Start (Power Supply)] and [Keyless Access with Push Button Start (Collation)]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)
  - Keyless Access with Push Button Start (Power Supply)
  - Keyless Access with Push Button Start (Collation)
Are any DTCs displayed? (Current code)

Yes : Perform the diagnosis for the displayed DTCs. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST

No : Go to 2.
CHECK DATA MONITOR .
1. Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Body Control]. Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR
  - Driver's door SW input
2. Read the data when opening and closing the driver's door.
Does the data change from [ON] → [OFF] according to the opening and closing?

Yes : Go to 3.

No : Inspect door switch circuit. Ref. to SECURITY AND LOCKS>DOOR LOCK CONTROL SYSTEM>INSPECTION>CHECK DOOR SWITCH
CHECK DATA MONITOR .
Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Keyless Access with Push Button Start (Collation)]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DATA MONITOR
- Shift P signal (AT only)
Is the status displayed correctly when the shift lever is shifted from P to other than P?

Yes : Go to 4.

No : Check the P range switch and harness. Ref. to CONTROL SYSTEMS>SHIFT LOCK SOLENOID AND P RANGE SWITCH>INSPECTION
CHECK DATA MONITOR .
Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Keyless Access with Push Button Start (Collation)]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DATA MONITOR
- Code collation result between smart ECM and ID code box
Is the displayed data [Normal]?

Yes : Go to 5.

No : Replace the keyless access control module. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS CONTROL MODULE>REMOVAL
CHECK DATA MONITOR .
Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Keyless Access with Push Button Start (Collation)]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DATA MONITOR
- Code collation result between steering locked ECM and ID code box
Is the displayed data [Normal]?

Yes : Go to 6.

No : Replace the steering lock control module. Ref. to SECURITY AND LOCKS>STEERING LOCK CONTROL MODULE>REPLACEMENT
CHECK DATA MONITOR .
1. Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Keyless Access with Push Button Start (Collation)]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DATA MONITOR
  - Steering lock lock/unlock command reception history
2. While in possession of the access key, perform engine start operations, and read data within 10 seconds after starting.
Is the displayed data [ON (keep 10 sec)]?

Yes : Go to 7.

No : Replace the keyless access control module. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS CONTROL MODULE>REMOVAL
CHECK STEERING LOCK CONTROL MODULE .
1. Set to ACC OFF, IGN OFF, and shift position P (AT only).
2. Using a tester, open the door, and measure the voltage between terminals of steering lock control module connector when the steering lock motor is driven.
  Connector & terminal
  
  (i89) No. 3 (+) - (i89) No. 1 (-):
Does the voltage change as follows? When steering lock motor is in operation, 1 V or less → When steering lock motor is not in operation, 9.5 V or more

Yes : Replace the steering lock control module. Ref. to SECURITY AND LOCKS>STEERING LOCK CONTROL MODULE>REPLACEMENT

No : Go to 8.
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 steering lock control module.
4. Using a tester, measure the resistance between the keyless access control module connector and steering lock control module connector.
  Connector & terminal
  
  (i89) No. 3 - (i91) No. 10:
Is the resistance less than 10 Ω?

Yes : Go to 9.

No : Repair or replace the open circuit of harness.
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 10 Ω?

Yes : Replace the keyless access control module. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS CONTROL MODULE>REMOVAL

No : Repair or replace the open circuit of harness.