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 [11/2015 -]
- IMMOBILISER SYSTEM DESCRIPTION
- The immobiliser system determines whether or not to enable starting of the hybrid control system based on a comparison of the key ID code and the vehicle pre-registered code. The immobiliser 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 immobiliser system activates and the hybrid control system cannot be started. The certification ECU (smart key ECU assembly) manages communication with the hybrid control system, ID code box (immobiliser code ECU) and hybrid vehicle control 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 hybrid control 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 key, the certification ECU (smart key ECU assembly) generates a request signal and sends it to the indoor electrical key oscillator. When the request signal is received, the indoor electrical key oscillator sends another request signal in order to detect whether the key is in the cabin. When the key receives this request signal, it sends back an ID code which includes a response code. The ID code sent from the key 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, if the driver presses the power switch, the certification ECU (smart key ECU assembly) recognizes the hybrid control system 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 and supplies the hybrid vehicle control ECU with power. Then the hybrid vehicle control ECU confirms that the certification ECU (smart key ECU assembly) is the proper ECU and operates the hybrid vehicle control ECU until the gearshift control is unlocked. After the gearshift control is unlocked, the hybrid vehicle control ECU sends an unlock completion signal to the certification ECU (smart key ECU assembly). When this signal is received, the ID code box (immobiliser code ECU) sends an immobiliser unset command signal to the hybrid control 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 combination meter sub-assembly.
- When the driver (or an occupant) gets in the vehicle and depresses the brake pedal while carrying the key, the certification ECU (smart key ECU assembly) generates a request signal and sends it to the indoor electrical key oscillator. When the request signal is received, the indoor electrical key oscillator sends another request signal in order to detect whether the key is in the cabin. When the key receives this request signal, it sends back an ID code which includes a response code. The ID code sent from the key 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
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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.