The Steering Lock Does Not Operate

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

1. CHECK DTC  .
   1. Turn the ignition switch to ON.
   2. Read the DTC of [Keyless Access with Push Button Start] using the Subaru Select Monitor. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Are any DTCs displayed? (Current malfunction)

   Yes  : Perform the diagnosis for the displayed DTCs.

   No  : Go to  2 .

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 to OFF according to the opening and closing?

   Yes  : Go to  3 .

   No  : Inspect door switch circuit.

3. CHECK DATA MONITOR  .

   Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Keyless Access with Push Button Start]. 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.

4. CHECK DATA MONITOR  .

   Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Keyless Access with Push Button Start]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DATA MONITOR .

   • Code collation result between smart ECM and ID code box

   Is the status normal?

   Yes  : Go to  5 .

   No  : Replace the keyless access control module. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS CONTROL MODULE>REMOVAL .

5. CHECK DATA MONITOR  .

   Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Keyless Access with Push Button Start]. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DATA MONITOR .

   • Code collation result between steering locked ECM and ID code box

   Is the status normal?

   Yes  : Go to  6 .

   No  : Replace the steering lock control module. Ref. to SECURITY AND LOCKS>STEERING LOCK CONTROL MODULE .

6. CHECK DATA MONITOR  .
   1. Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Keyless Access with Push Button Start]. 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 data displayed as Yes?

   Yes  : Go to  7 .

   No  : Replace the keyless access control module. Ref. to SECURITY AND LOCKS>KEYLESS ACCESS CONTROL MODULE>REMOVAL .

7. CHECK STEERING LOCK CONTROL MODULE  .

   Using an oscilloscope, measure the waveform between steering lock control module terminals immediately after the following operations.

   Perform ignition ON, driver's side door close → shift lever "P" range, ignition OFF, and close → open the driver's side door.

   Connector and terminal 

   (i47) No. 3 - (i47) No. 1:

   Is the waveform immediately after opening the driver's side door abnormal?

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

   No  : Go to  8 .

8. CHECK HARNESS (OPEN CIRCUIT)  .
   1. Disconnect the keyless access control module connector and the steering lock control module connector.
   2. Using a tester, measure the resistance between the keyless access control module connector and steering lock control module connector.

   Connector and terminal 

   (i47) No. 3 - (i75) No. 10:

   Is the resistance less than 10 Ω?

   Yes  : Go to  9 .

   No  : Repair or replace the open circuit of harness.

9. CHECK HARNESS (OPEN CIRCUIT)  .

   Using a tester, measure the resistance between the keyless access control module connector and chassis ground.

   Connector and terminal 

   (i241) No. 17 - Chassis ground:

   (i75) 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.