Engine Immobiliser System (W/ Entry And Start System) System Description

The immobiliser system is a theft deterrent system that determines whether to disable starting of the SFI 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 ID of the key-embedded transponder chip. If the ID codes do not match, the immobiliser system is activated and the SFI system cannot be started. The certification ECU (smart key ECU assembly) manages communication with the ECM, main body ECU (instrument panel junction block assembly), steering lock ECU (steering lock actuator assembly) and ID code box (immobiliser 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 SFI system to start.

Using the entry function

1. When the driver (or passenger) is sitting in the cabin while carrying the key, and the engine switch is pressed while the brake pedal is depressed, the main body ECU (instrument panel junction block assembly) recognizes that the engine start operation has occurred and sends a certification request signal to the certification ECU (smart key ECU assembly). Upon receipt of the certification request signal, the certification ECU (smart key ECU assembly) sends a request signal to the indoor electrical key oscillator. Upon receipt of the request signal, the indoor electrical key oscillator sends a request signal to detect if the key is inside the cabin. When the key receives this request signal, it answers by sending an ID code containing a response code to the door control receiver. Upon receipt of the ID code, the certification ECU (smart key ECU assembly) analyzes the code. If the interior certification passes, then the certification ECU (smart Key ECU assembly) sends a certification pass response signal to the main body ECU (instrument panel junction block assembly). When the main body ECU (instrument panel junction block assembly) receives this signal, the ACC relay is switched on and the IG1 and IG2 relays are switched on in sequence. At this time, the engine switch indicator light illuminates in green. Then the certification ECU (smart key ECU assembly) checks that power source mode has been changed and sends a steering lock command signal to the main body ECU (instrument panel junction block assembly). After receiving this signal, the main body ECU (instrument panel junction block assembly) supplies power to the steering lock actuator. Then the steering lock ECU (steering lock actuator assembly) confirms that the certification ECU (smart key ECU assembly) is certified (via the ID code box (immobiliser code ECU)) and drives the steering actuator motor until the steering is unlocked. After unlocking the steering, an unlock completed signal is sent to the certification ECU (smart key ECU assembly). Upon receipt of this signal, the certification ECU (smart key ECU assembly) sends an unset command signal to the ID code box (immobiliser code ECU). Once this signal is received, the ID code box (immobiliser code ECU) confirms that the certification ECU (smart key ECU assembly) is certified, sends an immobiliser unset command signal to the ECM, and sends a security indicator light off signal to the certification ECU (smart key ECU assembly).
   

Not using the entry function (when the key battery is depleted)

1. When the driver is sitting in the cabin while carrying the key and depressing the brake pedal, the main body ECU (instrument panel junction block assembly) recognizes that the stop light switch is on and sends a key confirmation request signal to the certification ECU (smart key ECU assembly). Upon receipt of this signal, the certification ECU (smart key ECU assembly) drives the immobiliser amplifier built in the engine switch. At this time, the engine switch sends an RF wave communication signal to the immobiliser. If the driver holds the key up to the engine switch at this time, the engine switch receives the immobiliser RF wave signal and responds by sending a radio wave signal. When the engine switch receives the radio wave signal from the key, it duplicates the signal and sends an ID code to the certification ECU (smart key ECU assembly). Upon receipt of the ID code, the code is analyzed. If the certification passes, a key certification pass response signal is sent to the main body ECU (instrument panel junction block assembly) while simultaneously sending a sound buzzer request signal to the meter ECU. When the main body ECU (instrument panel junction block assembly) receives this signal, the ACC relay is switched on and the IG1 and IG2 relays are switched on in sequence. At this time, the engine switch indicator light illuminates in green. Then the certification ECU (smart key ECU assembly) checks that power source mode has been changed and sends a steering lock command signal to the main body ECU (instrument panel junction block assembly). After receiving this signal, the main body ECU (instrument panel junction block assembly) supplies power to the steering lock actuator. Then the steering lock ECU (steering lock actuator assembly) confirms that the certification ECU (smart key ECU assembly) is certified (via the ID code box (immobiliser code ECU)) and drives the steering actuator motor until the steering is unlocked. After unlocking the steering, an unlock completed signal is sent to the certification ECU (smart key ECU assembly). Upon receipt of this signal, the certification ECU (smart key ECU assembly) sends an unset command signal to the ID code box (immobiliser code ECU). Once this signal is received, the ID code box (immobiliser code ECU) confirms that the certification ECU (smart key ECU assembly) is certified, sends an immobiliser unset command signal to the ECM, and sends a security indicator light off signal to the main body ECU (instrument panel junction block assembly).