Inspection steps

CAUTION:

Before performing troubleshooting, check the fuse for this circuit.
The steering lock system is equipped with functions that use multiplex communication. Firstly, please follow the directions in "How to troubleshoot" and then perform troubleshooting after confirming that there is no malfunction in the communication system.
After repair is completed, confirm that trouble symptoms do not reoccur.
Confirm that no diagnostic codes are output. (If diagnostic codes are output, firstly perform a diagnostic code flow chart check.)
When replacing the smart key computer ASSY (Collation ECM), the steering lock actuator ASSY (Steering lock ECM) or the ID code box (with ID code box), please check the applicable precautions (Refer to PRECAUTIONS ), and refer to the "Registration manual for immobilizer".
After replacing the steering lock actuator ASSY (Steering lock ECM), before starting the engine be sure to turn the steering mechanism to the left and right to confirm that the steering is not locked. If the steering is locked, perform the steering lock procedure (open and close any door when the vehicle is in the IG OFF state) and then unlock the steering (press the push button start switch). With the steering being locked, the engine cannot be started.

Operation check (IG ON)
1. Operate the push button start switch to check whether it can be placed in the IG ON state.
  Criteria: The ignition can be turned to IG ON.
OK: Go to next step

NG: Progress to "Smart entry & start system (smart entry function)" (Symptom table) (Refer to PROBLEM SYMPTOMS TABLE )

Reading the SSM4 data (unlock request reception state)

Use the SSM4 to perform smart key computer ASSY (Collation ECM) data monitoring.

PART NAME DESCRIPTION

Item name	Description/display range	Normal value	Remarks
[Steering lock unlock request reception status]	Indicates steering lock unlock request signal reception state. Display range: NG/OK (10 s)	NG: IG ON, ACC ON or engine start operation not performed OK: Within 10 seconds after IG ON, ACC ON or engine start operation	The engine cannot be started when the unlock request signal cannot be received. If "OK" is not displayed even if the steering unlock conditions are satisfied, there may be a smart key computer ASSY (Collation ECM) malfunction.

Criteria: An unlock request signal is received within 10 seconds after the engine is started.

OK: Go to next step

NG: Go to Step 8.

Inspection of the steering lock actuator ASSY (Steering lock ECM)

Measure the resistance between the terminals.

STANDARD VALUE RESISTANCE SPECIFICATION

Inspection terminals	Inspection conditions	Standard value
D59-1 (GND) - Chassis ground	Always	Less than 1 Ω

CAUTION: If defective, check for ground point looseness. (2) Measure the voltage between the terminals.

VOLTAGE SPECIFICATION

Inspection terminals	Inspection conditions	Standard value
D59-7 (B) - Chassis ground	Always	11 to 14 V

Courtesy of SUBARU OF AMERICA, INC.

OK: Go to next step

NG: Repair or replacement of wiring harness or connector

Inspection of the steering lock actuator ASSY (Steering lock ECM)

Use an oscilloscope to check the waveform between the terminals.

Item	Contents
Inspection terminals	D59-3 (SLR+) - D59-1 (GND)
Equipment setting	2 V/DIV, 200 ms/DIV
Inspection conditions	Steering lock actuator motor stopped →Steering lock actuator motor running →Steering lock actuator motor stopped

Courtesy of SUBARU OF AMERICA, INC.

NOTE:

Lock motor stopped: No operation
Lock motor running:
- Steering unlock:
  The electrical key transmitter SUB-ASSY (Electronic key) is being carried and the vehicle is set to ACC ON or IG ON.
- Steering lock:
  The door is opened while the shifter is in the P position (Transmission A/T) and the vehicle is set to IG OFF and ACC OFF.

OK: Go to next step

NG: Go to Step 10.

Reading the SSM4 data (S code check)

Use the SSM4 to perform smart key computer ASSY (Collation ECM) data monitoring.

PART NAME DESCRIPTION

Item name	Description/display range	Normal value	Remarks
[S Code Check]	Verification results between the collation ECM (smart key ECM ASSY) and the ID code box (immobilizer code ECM)/OK or NG.	OK: Confirmation results normal NG: Confirmation results abnormal Confirmation results abnormal	If abnormal: The ID code box (immobilizer code ECM) or the collation ECM (smart key ECM ASSY) ID codes are not registered, or they are malfunctioning. The steering is not locked. The steering is not unlocked. (The engine cannot be started.)

Criteria: [S code check] is "OK".

OK: Go to next step

NG: Go to Step 12.

Reading the SSM4 data (L code check)

Use the SSM4 to perform smart key computer ASSY (Collation ECM) data monitoring.

PART NAME DESCRIPTION

Item name	Description/display range	Normal value	Remarks
[L Code Check]	Display range indicating the collation results between the smart key computer ASSY (Collation ECM) and the steering lock actuator ASSY (Steering lock ECM). abnormal/normal	Abnormal: Collation results abnormal: Collation results normal	The smart key computer ASSY (Collation ECM) and the steering lock actuator ASSY (Steering lock ECM) are unable to perform L code registration. Steering lock cannot be performed. Steering unlock cannot be performed. (The engine cannot be started).

Criteria: [L code check] is "OK".

NOTE: Collation fault causes:

Steering lock actuator ASSY (Steering lock ECM) or smart key computer ASSY (Collation ECM) fault.
Communication malfunction between both ECMs.
One of the ECMs was replaced and is not yet registered.
When replaced with an ECM with a code that has already been written.

OK: Go to next step

NG: Go to Step 13.

Replacement of the steering lock actuator ASSY (Steering lock ECM)
1. Replace the steering lock actuator (Steering lock ECM) with a new part. (Refer to ASSEMBLY )
2. Perform registration. (Registration manual for immobilizer)
3. Turn the ignition switch to ON.
4. Operate the steering wheel to check the steering lock state.
Criteria: The steering lock is released.

OK: Go to next step

NG: Go to Step 14.

Complete (Failure of the steering lock actuator ASSY)

Inspection of the smart key computer ASSY (Collation ECM)

Disconnect the smart key computer ASSY (Collation ECM) connector D41.
Disconnect the brake actuator ASSY (skid control computer) connector A5.
Measure the resistance between the terminals.

STANDARD VALUE RESISTANCE SPECIFICATION

Inspection terminals	Inspection conditions	Standard value
D41-27 (SPD) - A5-2 (SPD)	Always	Less than 1 Ω
D41-27 (SPD) - A5-2 (SPD) - Chassis ground	Always	10 k Ωor more

OK: Go to next step

NG: Repair or replacement of wiring harness or connector

Smart key computer ASSY (Collation ECM)

Replace the smart key computer ASSY (Collation ECM) with a new part.
Carry out the registration settings. (Refer to the "Registration manual for immobilizer")
Turn the ignition switch to ON.
Use the SSM4 to perform smart key computer ASSY (Collation ECM) data monitoring.

PART NAME DESCRIPTION

Item name	Description/display range	Normal value	Remarks
[Steering lock unlock request reception status]	Indicates steering lock unlock request signal reception state. Display range: NG/OK (10 s)	NG: Signal reception without IG ON, ACC ON, or engine start operation (10s): Within 10 seconds after IG ON, ACC ON or engine start operation	The engine cannot be started when the unlock request signal cannot be received. If "OK" is not displayed even if the steering unlock conditions are satisfied, there may be a smart key computer ASSY (Collation ECM) malfunction.

Criteria: An unlock request signal is received within 10 seconds after the engine is started.

OK: Go to next step

NG: Replace the ID code box (immobilizer ECM)

Complete (Smart key computer ASSY (Collation ECM) fault)

Inspect the wiring harness and connector (Smart key computer ASSY (Collation ECM) - Steering lock actuator ASSY (Steering lock ECM)).

Disconnect the steering lock actuator (Steering lock ECM) connector D59.
Disconnect the smart key computer ASSY (Collation ECM) connector D41.
Confirm that there is no deformation or corrosion on the connector case and terminal.
Criteria: There is no deformation or corrosion on the connector case and terminal.

Measure the resistance between the terminals.

STANDARD VALUE RESISTANCE SPECIFICATION

Inspection terminals	Inspection conditions	Standard value
D41-29 (SLR+) -D59- 3(SLR+)	Always	Less than 1 Ω
D59-3 (SLR+) - Chassis ground	Always	10 k Ωor more

OK: Go to next step

NG: Repair or replacement of wiring harness or connector

Replacement of the steering lock actuator ASSY (Steering lock ECM)
1. Replace the steering lock actuator (Steering lock ECM) with a new part. (Refer to ASSEMBLY )
2. Perform registration. (Refer to the "Registration manual for immobilizer")
3. Turn the ignition switch to ON.
4. Operate the steering wheel to check the steering lock state.
Criteria: The steering lock is released.

OK: Go to next step

NG: Replacement of the smart key computer ASSY (Collation ECM)

Complete (Failure of the steering lock actuator ASSY)

Replace the ID code box (immobilizer ECM)

Replace the ID code box (immobilizer ECM) with a new part.
Perform registration. (Refer to the "Registration manual for immobilizer").
Turn the ignition switch to ON.

Use the SSM4 to perform smart key computer ASSY (Collation ECM) data monitoring.

PART NAME DESCRIPTION

Item name	Description/display range	Normal value	Remarks
[S Code Check]	Verification results between the collation ECM (smart key ECM ASSY) and the ID code box (immobilizer code ECM)/OK or NG.	OK: Confirmation results normal NG: Confirmation results abnormal Confirmation results abnormal	If abnormal: The ID code box (immobilizer code ECM) or the collation ECM (smart key ECM ASSY) ID codes are not registered, or they are malfunctioning. The steering is not locked. The steering is not unlocked. (The engine cannot be started.)

Criteria: [S code check] is "OK".

OK: Go to next step

NG: Replacement of the smart key computer ASSY (Collation ECM)

Complete (ID code box (immobilizer ECM) fault)|

Replace the ID code box (immobilizer ECM)

Replace the ID code box (immobilizer ECM) with a new part.
Perform registration. (Refer to the "Registration manual for immobilizer").
Turn the ignition switch to ON.

Use the SSM4 to perform smart key computer ASSY (Collation ECM) data monitoring.

PART NAME DESCRIPTION

Item name	Description/display range	Normal value	Remarks
[L Code Check]	Display range indicating the collation results between the smart key computer ASSY (Collation ECM) and the steering lock actuator ASSY (Steering lock ECM). abnormal/normal	Abnormal: Collation results abnormal: Collation results normal	The smart key computer ASSY (Collation ECM) and the steering lock actuator ASSY (Steering lock ECM) are unable to perform L code registration. Steering lock cannot be performed. Steering unlock cannot be performed. (The engine cannot be started).

Criteria: [L code check] is "OK".

OK: Go to next step

NG: Replacement of the steering lock actuator ASSY (Steering lock ECM) (Refer to ASSEMBLY )

Complete (ID code box (immobilizer ECM) fault)

Replacement of the smart key computer ASSY (Collation ECM)

Replace the smart key computer ASSY (Collation ECM) with a new part.
Perform registration. (Refer to the "Registration manual for immobilizer").
Turn the ignition switch to ON.

Use the SSM4 to perform smart key computer ASSY (Collation ECM) data monitoring.

PART NAME DESCRIPTION

Item name	Description/display range	Normal value	Remarks
[L Code Check]	Display range indicating the collation results between the smart key computer ASSY (Collation ECM) and the steering lock actuator ASSY (Steering lock ECM). abnormal/normal	Abnormal: Collation results abnormal: Collation results normal	The smart key computer ASSY (Collation ECM) and the steering lock actuator ASSY (Steering lock ECM) are unable to perform L code registration. Steering lock cannot be performed. Steering unlock cannot be performed. (The engine cannot be started).

Criteria: [L code check] is "OK".

NG: Replace the ID code box (immobilizer ECM)

Complete (Smart key computer ASSY (Collation ECM) fault)