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.
System Description [08/2022 - ]
- IMMOBILIZER SYSTEM DESCRIPTION
- The immobilizer system determines whether or not to enable starting of the SFI system based on a comparison of the key ID code and the vehicle pre-registered code. The immobilizer system compares the vehicle certification ECU (smart key ECU assembly) pre-registered ID code with the key-embedded transponder chip ID code. If the ID codes do not match, the immobilizer system activates and the SFI system cannot be started. The certification ECU (smart key ECU assembly) manages communication with the SFI system and ID code box (immobilizer code ECU). When the ID codes of the transponder chip and certification ECU (smart key ECU assembly) match, the certification ECU (smart key ECU assembly) authorizes the starting of the SFI system.
- SYSTEM FUNCTION
- Push-button start function
- When the driver (or an occupant) gets in the vehicle and depresses the brake pedal while carrying the electrical key transmitter sub-assembly, the certification ECU (smart key ECU assembly) generates a request signal and sends it to the indoor electrical key antenna. When the request signal is received, the indoor electrical key antenna sends another request signal in order to detect whether the electrical key transmitter sub-assembly is in the cabin. When the electrical key transmitter sub-assembly receives this request signal, it sends back an ID code which includes a response code. The ID code sent from the electrical key transmitter sub-assembly is sent to the certification ECU (smart key ECU assembly) via the door control receiver. When the ID code is received, the certification ECU (smart key ECU assembly) analyzes the code.
If the certification result is normal, the smart warning light is displayed on the multi-information display. When the smart warning light is displayed, and the driver presses the engine switch, the certification ECU (smart key ECU assembly) recognizes the engine start signal, turns the ACC relay on and turns the IG relay on, in that order, after 0.025 seconds. At this time, the certification ECU (smart key ECU assembly) confirms that the power source mode has changed. When this signal is received, the ID code box (immobilizer code ECU) sends an immobilizer unset command signal to the SFI system after confirming that the certification ECU (smart key ECU assembly) is the proper ECU. Then the certification ECU (smart key ECU assembly) sends a security indicator light off signal to the security indicator light (air conditioning control assembly).
- When the driver (or an occupant) gets in the vehicle and depresses the brake pedal while carrying the electrical key transmitter sub-assembly, the certification ECU (smart key ECU assembly) generates a request signal and sends it to the indoor electrical key antenna. When the request signal is received, the indoor electrical key antenna sends another request signal in order to detect whether the electrical key transmitter sub-assembly is in the cabin. When the electrical key transmitter sub-assembly receives this request signal, it sends back an ID code which includes a response code. The ID code sent from the electrical key transmitter sub-assembly is sent to the certification ECU (smart key ECU assembly) via the door control receiver. When the ID code is received, the certification ECU (smart key ECU assembly) analyzes the code.
- Push-button start function
NO RELATED
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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.