STEERING LOCK SYSTEM Steering Lock does not Lock

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 Lock Request Receive S Code Check L Code Check	-

WIRING DIAGRAM

INSPECTION PROCEDURE

Note

When using the GTS with the vehicle engine switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry & Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
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) with the shift lever in P.
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.
When replacing the steering lock ECU (steering lock actuator assembly), certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU), registration must be performed (Refer to the Service Bulletin).
After performing repairs, confirm that the problem does not occur.

PROCEDURE

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	Reception state of steering lock request signal 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 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.

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, and OK is displayed on the GTS screen.

INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH Click here

CHECK HARNESS AND CONNECTOR (GROUND)

Make sure that there is no looseness at the locking part and the connecting part of the connector.
Disconnect the H80 steering lock ECU (steering lock actuator assembly) connector.

Text in Illustration
*a	Front view of wire harness connector (to Steering Lock ECU (Steering Lock Actuator Assembly))

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

Standard Resistance

Tester Connection	Condition	Specified Condition
H80-1 (GND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

INSPECT STEERING LOCK ECU (MOTOR ACTIVATION COMMAND SIGNAL)

Reconnect the H80 steering lock ECU (steering lock actuator assembly) connector.
Turn the engine switch off, make sure that the steering is unlocked and move the shift lever to P.

Text in Illustration
*a	Component with harness connected (Steering Lock ECU (Steering Lock Actuator Assembly))
*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	H80-3 (IGE) - H80-1 (GND)
Tool Setting	2 V/DIV., 200 ms./DIV.
Vehicle Condition	Steering lock motor not operating → Operating → 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) with the shift lever in P.
To lock the steering, turn the engine switch off with the shift lever in P, and then open a door.

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the H80 steering lock ECU (steering lock actuator assembly) connector.
Disconnect the B75 certification ECU (smart key ECU assembly) 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
H80-3 (IGE) - B75-17 (SLR+)	Always	Below 1 Ω
H80-3 (IGE) - Body ground		10 kΩ or higher
B75-17 (SLR+) - Body ground		10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH
1. Remove the front door courtesy light switch assembly RH.
2. Inspect the front door courtesy light switch assembly RH Click here.
  
  OK
  
  Front door courtesy light switch assembly RH is normal.
NG
REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY

OK

OK
Front door courtesy light switch assembly RH is normal.

CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

Disconnect the B57 front door courtesy light switch assembly RH connector.
Disconnect the 13E instrument panel junction block assembly connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
B57-1 - 13E-11 (DCTY)	Always	Below 1 Ω
B57-1 - Body ground		10 kΩ or higher
13E-11 (DCTY) - Body ground		10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CERTIFICATION ECU (SMART KEY ECU))

Disconnect the H7 instrument panel junction block assembly connector.
Disconnect the B76 certification ECU (smart key ECU assembly) connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
H7-7 (RDA) - B76-13 (RDA3)	Always	Below 1 Ω
H7-8 (PRG) - B76-36 (PRG3)		Below 1 Ω
H7-7 (RDA) or B76-13 (RDA3) - Body ground		10 kΩ or higher
H7-8 (PRG) or B76-36 (PRG3) - Body ground		10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (BODY COMPUTER)
1. Replace the instrument panel junction block assembly (body computer) with a new one.
2. Turn the steering wheel and check the steering condition.
  
  OK
  
  Steering is locked.
NG
READ VALUE USING GTS (S CODE CHECK) Click here

OK

END (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (BODY COMPUTER) WAS DEFECTIVE)

OK
Steering is locked.

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 NG is displayed: The ID code for the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is not registered or the certification ECU (smart key ECU assembly) or ID code box (immobiliser code 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 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 ECU (steering lock actuator assembly) / OK or NG	OK: Verification result normal NG: Verification result abnormal	When NG is displayed: The ID code for the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator assembly) is not registered or the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator 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 steering lock ECU (steering lock actuator 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 STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) Click here

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

OK

END (STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) WAS DEFECTIVE)

OK
Steering is unlocked.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

Replace the certification ECU (smart key ECU assembly) with a new one (Refer to the Service Bulletin).
Perform registration procedures (Refer to the 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 NG is displayed: The ID code for the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is not registered or the certification ECU (smart key ECU assembly) or ID code box (immobiliser code 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.

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)

Replace the steering lock ECU (steering lock actuator assembly) with a new one Click here.
Perform registration procedures (Refer to the 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 ECU (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 ECU (steering lock actuator assembly) is not registered or the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator 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.

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

END (STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) WAS DEFECTIVE)