STEERING COLUMN STEERING LOCK SYSTEM Unable to Unlock Steering Wheel (Engine cannot Start)
DESCRIPTION
The steering lock actuator assembly activates the steering lock motor and moves the lock bar into the steering column to lock the steering.
The steering may not unlock when the lock bar gets stuck in the lock hole of the steering column. In this case, if the engine switch is turned on (IG) while shaking the steering wheel, as is done for a vehicle with a mechanical key, the lock bar will be unlocked. If the certification ECU (smart key ECU assembly), ID code box (immobiliser code ECU) or ECM is replaced, the system needs to be initialized. Otherwise, the steering cannot be unlocked and the engine cannot be started.
| Problem Symptom | Data List Item | Active Test Item |
|---|---|---|
| Unable to unlock steering wheel (Engine cannot start) | Entry&Start
·
All items Click here( |
- |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
- NOTICE:
- ·
When using the GTS with the 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 (for CVT).
·To lock the steering, turn the engine switch off with the shift lever in P (for CVT), and then open a door.
·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 herePower Source / Network>NETWORKING>LIN COMMUNICATION SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING
·After performing repairs, confirm that the problem does not recur.
·Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart.
Click hereSteering>STEERING COLUMN>STEERING LOCK SYSTEM>DIAGNOSTIC TROUBLE CODE CHART
·Inspect the fuses for circuits related to this system before performing the following procedure.
·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 Service Bulletin).
·When disconnecting the cable from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected.
Click hereGeneral>INTRODUCTION>REPAIR INSTRUCTION>INITIALIZATION
·If the steering lock ECU (steering lock actuator assembly) is replaced, be sure to confirm that the steering is unlocked by turning the steering wheel to the left and right before starting the engine. This function prevents the engine from starting while the steering is locked. If the steering is locked for any reason, open and close a door with the engine switch off, and then unlock the steering by pressing the engine switch.
PROCEDURE
- Result:
Proceed to OK NG
OK
NG
Check the power source mode change.
When the key is inside the vehicle and the shift lever is in P, check that pressing the engine switch with the brake pedal released causes the power source mode to change as follows (for CVT):
When the key is inside the vehicle, check that pressing the engine switch with the clutch released causes the power source mode to change as follows (for Manual transaxle):
- OK:
Off → On (ACC) → On (IG) → Off
- Result:
Proceed to OK NG
OK
NG
Use the Data List to check if the steering lock request is functioning properly.
- Body Electrical > Entry&Start > Data List
-
Tester Display Measurement Item Range Normal Condition Diagnostic Note Unlock Request Receive Reception state of steering unlock request signal by certification ECU (smart key ECU assembly) sent to ID code box (immobiliser code ECU)
- HINT:
- ·
The reception state is maintained for 10 seconds.
·When 10 seconds or more have elapsed after receiving the signal, the item changes to "NG".
OK or NG OK: Within 10 seconds of turning engine switch on (IG) or on (ACC) or starting engine
NG: Except above·If the unlock signal has not been received, the engine cannot be started.
·If this item does not change to "OK" even though the steering unlock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.
- Body Electrical > Entry&Start > Data List
-
Tester Display Unlock Request Receive - 50003 125 67
- OK:
Within 10 seconds of turning the engine switch on (ACC) or on (IG) or starting the engine, the Data List item changes to "OK".
- Result:
Result Proceed to OK (for CVT) A OK (for Manual transaxle) B NG C
A
B
C
Measure the voltage according to the value(s) in the table below.
| *a | Component with harness connected
(Certification ECU (Smart Key ECU Assembly)) |
- | - |
- Standard Voltage:
Tester Connection Condition Specified Condition E49-25 (P) - E47-11 (E) Shift lever in P 9 V or higher E49-25 (P) - E47-11 (E) Shift lever not in P 1.5 V or less
- Result:
Proceed to OK NG
OK
NG
Disconnect the E51 steering lock ECU (steering lock actuator assembly) connector.
| *a | Front view of wire harness connector
(to Steering Lock ECU (Steering Lock Actuator Assembly)) |
Measure the resistance and voltage according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition E51-1 (GND) - Body ground Always Below 1 Ω
- NOTICE:
-
If the result is not as specified, check for looseness in the ground cable connection.
- Standard Voltage:
Tester Connection Condition Specified Condition E51-7 (B) - Body ground Always 11 to 14 V
- Result:
Proceed to OK NG
OK
NG
Reconnect the E51 steering lock ECU (steering lock actuator assembly) connector.
| *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 E51-3 (IGE) - E51-1 (GND) Tool Setting 2 V/DIV., 200 ms./DIV. Vehicle Condition Steering lock motor not operating → Operating → Not operating
- HINT:
- ·
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 (for CVT).
·To lock the steering, turn the engine switch off with the shift lever in P (for CVT), and then open a door.
- Result:
Proceed to OK NG
OK
NG
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the E51 steering lock ECU (steering lock actuator assembly) connector.
Disconnect the E49 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.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition E51-3 (IGE) - E49-29 (SLR+) Always Below 1 Ω E51-3 (IGE) or E49-29 (SLR+) - Body ground Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG
Disconnect the E7 shift lock control ECU (transmission floor shift assembly) connector.
Disconnect the E49 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 E7-3 (P2) - E49-25 (P) Always Below 1 Ω E7-3 (P2) or E49-25 (P) - Body ground Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG
Reconnect the E7 shift lock control ECU (transmission floor shift assembly) connector.
| *a | Component with harness connected
(Shift Lock Control ECU (Transmission Floor Shift Assembly)) |
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Condition Specified Condition E7-3 (P2) - Body ground Shift lever in P 9 V or higher E7-3 (P2) - Body ground Shift lever not in P 1.5 V or less
- Result:
Proceed to OK NG
OK
NG
Use the Data List to check if S code certification is functioning properly.
- Body Electrical > Entry&Start > Data List
-
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 abnormalWhen a malfunction is present:
·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).
- Body Electrical > Entry&Start > Data List
-
Tester Display S Code Check - 50003 125 65
- OK:
OK is displayed on the GTS.
- HINT:
-
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.
- Result:
Proceed to OK NG
OK
NG
Use the Data List to check if L code certification is functioning properly.
- Body Electrical > Entry&Start > Data List
-
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 abnormalWhen 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).
- Body Electrical > Entry&Start > Data List
-
Tester Display L Code Check - 50003 125 66
- OK:
OK is displayed on the GTS.
- HINT:
-
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.
- Result:
Proceed to OK NG
OK
NG
Replace the steering lock ECU (steering lock actuator assembly) with a new one.
Click hereSteering>STEERING COLUMN>STEERING COLUMN ASSEMBLY>DISASSEMBLY
Perform registration (refer to Service Bulletin).
Turn the engine switch on (IG).
Turn the steering wheel and check the steering condition.
- OK:
Steering is unlocked.
- Result:
Proceed to OK NG
OK
NG
Replace the ID code box (immobiliser code ECU) with a new one.
Perform registration (refer to Service Bulletin).
Use the Data List to check if L code certification is functioning properly.
- Body Electrical > Entry&Start > Data List
-
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 abnormalWhen 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).
- Body Electrical > Entry&Start > Data List
-
Tester Display L Code Check - 50003 125 66
- OK:
OK is displayed on the GTS.
- Result:
Proceed to OK NG
OK
NG
Replace the ID code box (immobiliser code ECU) with a new one.
Perform registration (refer to Service Bulletin).
Use the Data List to check if S code certification is functioning properly.
- Body Electrical > Entry&Start > Data List
-
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 abnormalWhen a malfunction is present:
·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).
- Body Electrical > Entry&Start > Data List
-
Tester Display S Code Check - 50003 125 65
- OK:
OK is displayed on the GTS.
- Result:
Proceed to OK NG
OK
NG