DESCRIPTION The steering
lock actuator or upper bracket assembly 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, 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 | |
Steering Lock does not Lock | Smart Key
- Lock Request Receive
- L Code Check
- Steering Lock
Main Body
Power Source Control
| - | WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
- When using the Techstream with the engine switch off, connect the
Techstream to the vehicle and turn a courtesy light switch on and off at
intervals of 1.5 seconds or less until communication between the
Techstream and the vehicle begins. Then select Model Code "KEY REGIST"
under manual mode and enter the following menus: Body Electrical / Smart
Key. While using the Techstream, periodically turn a courtesy light
switch on and off at intervals of 1.5 seconds or less to maintain
communication between the Techstream 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).
- 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 smart key system (for Start Function, Gasoline Model) uses the LIN
communication system and CAN communication system. Inspect the
communication function by following How to Proceed with Troubleshooting.
Troubleshoot the smart key system (for Start Function, Gasoline Model)
after confirming that the communication systems are functioning
properly.
Click here
- Before replacing the steering lock ECU (steering lock actuator or upper
bracket assembly) or certification ECU (smart key ECU assembly) refer to
Registration.
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- After performing repairs, confirm that the problem does not recur.
- Inspect the fuses for circuits related to this system before performing the following procedure.
- When disconnecting the cable from the negative (-) battery terminal,
some systems need to be initialized after the cable is reconnected.
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PROCEDURE |
1. | READ VALUE USING TECHSTREAM (LOCK REQUEST RECEIVE) |
(a) Use the Data List to check if the steering lock command is functioning properly. Body Electrical > Smart Key > Data List
|
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note | |
Lock Request Receive | Status of steering lock command from certification ECU (smart key ECU assembly) |
OK or NG | OK:
Certification ECU (smart key ECU assembly) sends steering lock command
(within 10 seconds of any door opened with shift lever in P and engine
switch off) NG: Certification ECU (smart key ECU
assembly) does not send steering lock command (no door opened with shift
lever in P and engine switch off) |
If
OK is not displayed even though the steering lock conditions are met,
the certification ECU (smart key ECU assembly) may be malfunctioning. | Body Electrical > Smart Key > Data List
|
Tester Display | | Lock Request Receive |
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 on
(ACC) or off and opening a door with the shift lever in P, and OK is
displayed on the Techstream screen.
| NG |  |
GO TO STEP 7 |
|
OK |
 | |
| 2. |
READ VALUE USING TECHSTREAM (L CODE CHECK) |
(a) Use the Data List to check if L code certification is functioning properly. Body Electrical > Smart Key > Data List
|
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note | |
L Code Check | Verification result between certification ECU (smart key ECU assembly) 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 certification ECU (smart key ECU assembly) or
steering lock ECU (steering lock actuator assembly) is not registered,
or the certification ECU (smart key ECU assembly) 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 > Smart Key > Data List
|
Tester Display | | L Code Check |
OK: OK is displayed on the Techstream. HINT: Reasons for verification failure:
- The steering lock ECU (steering lock actuator or upper bracket assembly)
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.
| NG |
| REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) |
|
OK | |
| |
| 3. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE) |
(a) Disconnect the G43 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
| (b) Measure the resistance and voltage according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G43-1 (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 | |
G43-7 (B) - Body ground |
Always | 11 to 14 V | |
 |
|
*a | Front view of wire harness connector
(to Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly)) | | |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 4. |
CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) |
(a) Connect the G43 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(b) Move the shift lever to P and turn the engine switch off. (c) Check the signal waveform according to the condition(s) in the table below.
|
*a | Component with harness connected
(Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly)) |
*b | Steering lock motor not operating | |
*c | Steering lock motor operating |
*d | Waveform |
OK: |
Tester Connection | Condition |
Tool Setting | Specified Condition | |
G43-3 (IGE) - G43-1 (GND) |
2 V/DIV., 200 ms./DIV. |
Steering lock motor not operating → Operating → Not operating |
Pulse generation (See waveform) |
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 electrical key transmitter sub-assembly 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.
| OK |
| REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) |
|
NG | |
| |
| 5. |
CHECK
HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR
UPPER BRACKET ASSEMBLY) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) |
(a) Disconnect the G43 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(b) Disconnect the G40 certification ECU (smart key ECU assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G43-3 (IGE) - G40-25 (SLR+) |
Always | Below 1 Ω | |
G43-3 (IGE) or G40-25 (SLR+) - Other terminals and body ground |
Always | 10 kΩ or higher |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 6. |
CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) |
(a) Connect the G43 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(b) Connect the G40 certification ECU (smart key ECU assembly) connector.
| (c) Measure the voltage according to the value(s) in the table below.
Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
G43-3 (IGE) - Body ground |
Always | 11 to 14 V | |
 |
|
*a | Component with harness connected
(Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly)) | | |
| OK |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| NG |
| REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) |
| 7. |
READ VALUE USING TECHSTREAM (FL DOOR COURTESY SW) |
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG).
(c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Smart Key / Data List.
(e)
Using the Techstream, check the following main body ECU (multiplex
network body ECU) Data List item by opening and closing the driver door
to confirm the state of the front door courtesy light switch assembly. Body Electrical > Main Body > Data List
|
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note | |
FL Door Courtesy SW | Front door LH courtesy light switch signal |
OFF or ON | OFF: Front door LH closed
ON: Front door LH open |
- | Body Electrical > Main Body > Data List
|
Tester Display | | FL Door Courtesy SW |
OK: The Data List item changes in accordance with the opening and closing of the driver door.
| NG |
| GO TO LIGHTING SYSTEM (Front Door Courtesy Switch Circuit) |
|
OK | |
| |
| 8. |
READ VALUE USING TECHSTREAM (SHIFT P SIGNAL) |
(a) Move the shift lever to P. (b) Read the Data List according to the display on the Techstream. Body Electrical > Power Source Control > Data List
|
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note | |
Shift P Signal | Shift position P |
OFF or ON | OFF: Shift lever not in P
ON: Shift lever in P | Use this item to determine if the park/neutral position switch assembly is malfunctioning. | Body Electrical > Power Source Control > Data List
|
Tester Display | | Shift P Signal |
OK: ON is displayed on the Techstream.
| NG |
| GO TO OTHER PROBLEM |
|
OK | |
| |
| 9. |
READ VALUE USING TECHSTREAM (STEERING LOCK) |
(a) Check that the steering is unlocked. (b) Read the Data List according to the display on the Techstream. Body Electrical > Smart Key > Data List
|
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note | |
Steering Lock | Steering lock ECU (steering lock actuator or upper bracket assembly) lock confirmation status |
Unset or Set | Unset: Lock not confirmed
Set: Lock confirmed | When Unset is displayed, the steering is not locked. | Body Electrical > Smart Key > Data List
|
Tester Display | | Steering Lock |
OK: Set is displayed on the Techstream.
| OK |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| NG |
| REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) | | 
