STEERING LOCK SYSTEM Unable to Lock Steering Wheel

DESCRIPTION

The steering lock actuator activates the steering lock motor and moves the lock bar into the steering column to lock the steering.

When the steering lock is operating, the steering may not lock when the lock bar is not aligned with the lock hole of the steering column. In this case, the steering can be locked by turning the steering wheel a little in the same manner as is done for a vehicle with a mechanical key to change the position of the lock hole.

Related Data List and Active Test Items
Problem Symptom	Data List Item	Active Test Item
Unable to lock steering wheel	Entry&Start All items Click here Main Body D Door Courtesy SW	-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Note

When using the GTS with the engine switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and vehicle begins, or 2) connect the GTS to the vehicle and select "Manual" from the initial screen on the GTS. Select "Key Code Registration" under model code.
Perform either of the following operations to lock/unlock the steering:

To unlock the steering, carry the key and turn the engine switch on (ACC) or on (IG).
To lock the steering, turn the engine switch off with the shift lever in P*, and then open a door.

Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart Click here.
The steering lock system uses LIN communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting Click here.
Before replacing the certification ECU (smart key ECU assembly), steering lock actuator assembly (steering lock ECU) or ID code box (immobiliser code ECU) (w/ ID Code Box), refer to Service Bulletin.
After completing repairs, confirm that the problem does not occur.
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
When disconnecting the cable from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected Click here.

*: for Automatic Transmission

PROCEDURE

CHECK DTC (ALL)
1. Using the GTS, confirm the output of DTCs for all systems.
  
  OK
  
  No DTCs are output.
  Note
  - When using the GTS with the engine switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and vehicle begins, or 2) connect the GTS to the vehicle and select "Manual" from the initial screen on the GTS. Select "Key Code Registration" under model code.
  - Make sure that no DTCs are output. If any DTCs are output, proceed to Diagnostic Trouble Code Chart Click here.
NG
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

OK

OK
No DTCs are output.

READ VALUE USING GTS (LOCK REQUEST RECEIVE)

Use the Data List to check if the steering lock command is functioning properly.

Entry&Start
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Lock Request Receive*1	Reception state of steering lock command signal determined by certification ECU (smart key ECU assembly) and sent to ID code box (immobiliser code ECU) / OK or NG Tech Tips The reception state is maintained for 10 seconds. When 10 seconds or more elapse after receiving the signal, the item changes to "NG"	OK: Within 10 seconds of opening any door with engine switch off and shift lever in P*3 NG: Except above	If this item does not change to "OK" even though the steering lock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.
Lock Request Receive*2	Reception state of steering lock command signal determined by certification ECU (smart key ECU assembly) / OK or NG Tech Tips The reception state is maintained for 10 seconds. When 10 seconds or more elapse after receiving the signal, the item changes to "NG"	OK: Within 10 seconds of opening any door with engine switch off and shift lever in P*3 NG: Except above	If this item does not change to "OK" even though the steering lock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.

*1: w/ ID Code Box
*2: w/o ID Code Box
*3: for Automatic Transmission

OK
The certification ECU (smart key ECU assembly) receives a lock request signal within 10 seconds of turning the engine switch from on (IG) to off and opening a door with the shift lever in P (for automatic transmission), and OK is displayed on the GTS screen.

READ VALUE USING GTS (D DOOR COURTESY SW) Click here

CHECK STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) (MOTOR ACTIVATION COMMAND SIGNAL)

Disconnect the D59 steering lock actuator assembly (steering lock ECU) connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
D59-1 (SLR+) - Body ground	Always	Below 1 Ω

Reconnect the D59 steering lock actuator assembly (steering lock ECU) connector.
Turn the engine switch off, make sure that the steering is unlocked and move the shift lever to P*.
- *: for Automatic Transmission

Text in Illustration
*a	Component with harness connected (Steering Lock Actuator Assembly (Steering Lock ECU))
*b	Steering lock motor not operating
*c	Steering lock motor operating

Check the signal waveform according to the condition(s) in the table below.

Standard Frequency
Item	Content
Tester Connection	D59-3 (SLR+) - D59-1 (GND)
Tool Setting	2 V/DIV., 200 ms./DIV.
Vehicle Condition	Steering lock motor not operating → Steering lock motor operating → Steering lock motor not operating

Tech Tips

When taking measurements when the lock motor is stopped, it is not necessary to perform any operations.
In order to take measurements when the lock motor is operating, perform either of the following operations:

To unlock the steering, carry the key and turn the engine switch on (ACC) or on (IG).
To lock the steering, turn the engine switch off with the shift lever is in P*, and then open a door.

*: for Automatic Transmission

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU))

Disconnect the D41 certification ECU (smart key ECU assembly) connector.
Disconnect the D59 steering lock actuator assembly (steering lock ECU) connector.
Check for deformation and corrosion of the connector case and terminals.

OK

There is no deformation or corrosion of the connector case or terminals.

OK
There is no deformation or corrosion of the connector case or terminals.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
D41-29 (SLR+) - D59-3 (SLR+)	Always	Below 1 Ω
D59-3 (SLR+) - Body ground	Always	10 kΩ or higher
D41-29 (SLR+) - Body ground	Always	10 kΩ or higher

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

READ VALUE USING GTS (D DOOR COURTESY SW)

Using the GTS, check the following main body ECU (network gateway ECU) Data List item by opening and closing the driver door to confirm the state of the driver side door courtesy light switch.

Main Body
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
D Door Courtesy SW	Driver side door courtesy switch / ON or OFF	ON: Driver side door open OFF: Driver side door closed	If this item does not change according to the actual state of the driver side door, there is a malfunction in the door courtesy light switch or related part.

OK
The Data List item changes in accordance with the opening and closing of the driver side door.

Result

Result	Proceed to
OK (w/o ID Code Box)	A
OK (w/ ID Code Box)	B
NG	C

READ VALUE USING GTS (S CODE CHECK) Click here

GO TO LIGHTING SYSTEM (FRONT DOOR COURTESY SWITCH CIRCUIT) Click here

READ VALUE USING GTS (L CODE CHECK)

Use the Data List to check if L code certification is functioning properly.

Entry&Start
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
L Code Check	Verification result between certification ECU (smart key ECU assembly) and steering lock actuator assembly / OK or NG	OK: Verification result normal NG: Verification result abnormal	When a malfunction is present: The ID code for the certification ECU (smart key ECU assembly) or steering lock actuator assembly (steering lock ECU) is not registered or the certification ECU (smart key ECU assembly) or steering lock actuator assembly (steering lock ECU) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

OK
OK is displayed on the GTS.

Tech Tips

Reasons for verification failure:

The steering lock actuator assembly (steering lock ECU) or certification ECU (smart key ECU assembly) is malfunctioning.
There is a problem with the communication between ECUs.
An ECU is replaced, but is not registered.
An ECU is replaced with an ECU which has a code already stored in it.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)
1. Replace the steering lock actuator assembly (steering lock ECU) with a new one Click here.
2. Perform registration (refer to Service Bulletin).
3. Turn the engine switch on (IG).
4. Turn the steering wheel and check the steering condition.
  
  OK
  
  Steering is unlocked.
OK
END

NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK
Steering is unlocked.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

Replace the certification ECU (smart key ECU assembly) with a new one.
Perform registration (refer to Service Bulletin).

Use the Data List to check if L code certification is functioning properly again.

Entry&Start
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
L Code Check	Verification result between certification ECU (smart key ECU assembly) and steering lock actuator assembly / OK or NG	OK: Verification result normal NG: Verification result abnormal	When a malfunction is present: The ID code for the certification ECU (smart key ECU assembly) or steering lock actuator assembly (steering lock ECU) is not registered or the certification ECU (smart key ECU assembly) or steering lock actuator assembly (steering lock ECU) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

OK
OK is displayed on the GTS.

END

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Click here

READ VALUE USING GTS (S CODE CHECK)

Use the Data List to check if S code certification is functioning properly.

Entry&Start
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
S Code Check	Verification result between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) / OK or NG	OK: Verification result normal NG: Verification result abnormal	When a malfunction is present: The ID code for the ID code box (immobiliser code ECU) or certification ECU (smart key ECU assembly) is not registered or the ID code box (immobiliser code ECU) or certification ECU (smart key ECU assembly) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

OK
OK is displayed on the GTS.

Tech Tips

Reasons for verification failure:

The certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is malfunctioning.
There is a problem with the communication between ECUs.
An ECU is replaced, but is not registered.
An ECU is replaced with an ECU which has a code already stored in it.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

READ VALUE USING GTS (L CODE CHECK)

Use the Data List to check if L code certification is functioning properly.

Entry&Start
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
L Code Check	Verification result between ID code box (immobiliser code ECU) and steering lock actuator assembly / OK or NG	OK: Verification result normal NG: Verification result abnormal	When a malfunction is present: The ID code for the ID code box (immobiliser code ECU) or steering lock actuator assembly (steering lock ECU) is not registered or the ID code box (immobiliser code ECU) or steering lock actuator assembly (steering lock ECU) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

OK
OK is displayed on the GTS.

Tech Tips

Reasons for verification failure:

The steering lock actuator assembly (steering lock ECU) or ID code box (immobiliser code ECU) is malfunctioning.
There is a problem with the communication between ECUs.
An ECU is replaced, but is not registered.
An ECU is replaced with an ECU which has a code already stored in it.

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Click here

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)
1. Replace the steering lock actuator assembly (steering lock ECU) with a new one Click here.
2. Perform registration (refer to Service Bulletin).
3. Turn the engine switch on (IG).
4. Turn the steering wheel and check the steering condition.
  
  OK
  
  Steering is unlocked.
OK
END

NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK
Steering is unlocked.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

Replace the certification ECU (smart key ECU assembly) with a new one.
Perform registration (refer to Service Bulletin).

Use the Data List to check if S code certification is functioning properly again.

Entry&Start
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
S Code Check	Verification result between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) / OK or NG	OK: Verification result normal NG: Verification result abnormal	When a malfunction is present: The ID code for the ID code box (immobiliser code ECU) or certification ECU (smart key ECU assembly) is not registered or the ID code box (immobiliser code ECU) or certification ECU (smart key ECU assembly) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

OK
OK is displayed on the GTS.

END

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

Replace the steering lock actuator assembly (steering lock ECU) with a new one Click here.
Perform registration (refer to Service Bulletin).

Use the Data List to check if L code certification is functioning properly again.

Entry&Start
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
L Code Check	Verification result between ID code box (immobiliser code ECU) and steering lock actuator assembly / OK or NG	OK: Verification result normal NG: Verification result abnormal	When a malfunction is present: The ID code for the ID code box (immobiliser code ECU) or steering lock actuator assembly (steering lock ECU) is not registered or the ID code box (immobiliser code ECU) or steering lock actuator assembly (steering lock ECU) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).

OK
OK is displayed on the GTS.

END

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)