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.
Basic Inspection
The engine start function, door lock function, power distribution system and NATS-IVIS/NVIS in the Intelligent Key system are closely related to each other regarding control. Narrow down the functional area in question by performing basic inspection to identify which function is malfunctioning. The vehicle security function can operate only when the door lock and power distribution system are operating normally. Therefore, it is easy to identify any factor unique to the vehicle security system by performing the vehicle security operation check after basic inspection.
- CHECK DOOR LOCK OPERATION
- Check the door lock for normal operation with the Intelligent Key controller and door request switch. Successful door lock operation with the Intelligent Key and request switch indicates that the remote keyless entry receiver and inside key antenna required for engine start are functioning normally. Identify the malfunctioning part by referring to the DOOR & LOCK article if the door cannot be unlocked.
Can the door be locked with the Intelligent Key and door request switch?
YES: GO TO 2.
NO: Refer to "SYMPTOM TABLE ".
- CHECK ENGINE STARTING
- Checks that the engine starts when operating the Intelligent Key inserted into the key slot.
Does the engine start?
YES: GO TO 3.
NO: Refer to "SYMPTOM TABLE ".
- CHECK STEERING LOCKING
- Does the steering lock when operating door switch after switching the power supply from ON position (or ACC position) to LOCK position?
If door switch is malfunctioning, BCM cannot lock the steering. If BCM does not detect DTC, steering lock unit is normal.
Does steering lock?
YES: GO TO 4.
NO: Refer to "COMPONENT FUNCTION CHECK ".
- CHECK POWER SUPPLY INDICATOR SWITCHING
- Press push-button ignition switch and position indicator will switch from LOCK, ACC to ON gradually when steering is locked. Checks that the position indicator is illuminated at different positions of the circuit.
Is each position indicator illuminating?
YES: GO TO 5.
NO: Refer to "COMPONENT FUNCTION CHECK ".
- CHECK VEHICLE SECURITY SYSTEM
- Check the vehicle security system for normal operation.
The vehicle security function can operate only when the door lock and power distribution functions are operating normally.
Therefore, it is easy to identify any factor unique to the vehicle security by performing the vehicle security operation check after this basic inspection.
Go to "VEHICLE SECURITY OPERATION CHECK ".
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.