Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Problem Symptoms Table
HINT:
Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Steering lock system
| Symptom | Suspected Area | Refer To |
|---|---|---|
| Steering wheel cannot unlock (engine cannot start). | Smart access system with push-button start | HOW TO PROCEED WITH TROUBLESHOOTING |
| Main body ECU | TERMINALS OF ECU | |
| Certification ECU | TERMINALS OF ECU | |
| Power source circuit | POWER SOURCE CIRCUIT | |
| Steering lock motor drive power circuit | STEERING LOCK MOTOR DRIVE POWER CIRCUIT | |
| Steering lock actuator (Steering lock ECU) | TERMINALS OF ECU | |
| Unlock position sensor signal circuit | UNLOCK POSITION SENSOR SIGNAL CIRCUIT | |
| Steering wheel cannot unlock (after connecting Techstream to DLC3, starting engine, Data List certification ECUs item Lock/Unlock Receive data is read, and steering lock command reception records display is NO). | Smart access system with push-button start | HOW TO PROCEED WITH TROUBLESHOOTING |
| Main body ECU | TERMINALS OF ECU | |
| Certification ECU | TERMINALS OF ECU | |
| ID code box | - | |
| LIN communication line | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Steering wheel cannot lock. | Smart access system with push-button start | HOW TO PROCEED WITH TROUBLESHOOTING |
| Main body ECU | TERMINALS OF ECU | |
| Certification ECU | TERMINALS OF ECU | |
| Power source circuit | POWER SOURCE CIRCUIT | |
| Steering lock motor drive power circuit | STEERING LOCK MOTOR DRIVE POWER CIRCUIT | |
| Steering lock actuator (Steering lock ECU) | TERMINALS OF ECU | |
| Steering wheel cannot lock (after connecting Techstream to DLC3, starting engine, Data List certification ECUs item Lock/Unlock Receive data is read, and steering lock command reception records display is NO). | Smart access system with push-button start | HOW TO PROCEED WITH TROUBLESHOOTING |
| Main body ECU | TERMINALS OF ECU | |
| Certification ECU | TERMINALS OF ECU | |
| ID code box | - | |
| LIN communication line | HOW TO PROCEED WITH TROUBLESHOOTING |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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