System Description [03/2017 - ]

ENGINE IMMOBILISER SYSTEM DESCRIPTION
1. The engine immobiliser 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 engine immobiliser system compares the vehicle certification ECU (smart key ECU assembly) pre-registered ID code with the electrical key transmitter sub-assembly-embedded transponder chip ID code. If the ID codes do not match, the engine immobiliser system activates and the SFI system cannot be started. The certification ECU (smart key ECU assembly) manages communication with the SFI system, 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 starting of the SFI system.
- *: w/ ID Code Box
SYSTEM FUNCTION
1. Push-button start function (w/ ID Code Box)
  1. When the driver (or an occupant) gets in the vehicle and depresses the brake pedal*1 or clutch pedal*2 while carrying the electrical key transmitter sub-assembly, the certification ECU (smart key ECU assembly) recognizes that the brake pedal*1 or clutch pedal*2 is depressed and sends an electrical key transmitter sub-assembly certification request signal 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 electrical key transmitter sub-assembly is inside the vehicle. 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 entry key indicator light in the combination meter assembly illuminates in green. When the indicator illuminates in green 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 IG1 and IG2 relays 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 steering lock actuator with power.
    
    Then (via the ID code box (immobiliser code ECU)) the steering lock ECU (steering lock actuator assembly) confirms that the certification ECU (smart key ECU assembly) is the proper ECU and drives the steering actuator motor until the steering lock is unlocked.
    
    After the steering lock is unlocked, the steering lock ECU (steering lock actuator assembly) sends an unlock completion signal to the certification ECU (smart key ECU assembly).
    
    When this signal is received, the certification ECU (smart key ECU assembly) sends an immobiliser unset command signal to the ID code box (immobiliser code ECU).
    
    Once this signal is received, the ID code box (immobiliser code ECU) sends an immobiliser unset command signal to the SFI system.
    - *1: for Automatic Transmission
    - *2: for Manual Transmission
2. Push-button start function (w/o ID Code Box)
  1. When the driver (or an occupant) gets in the vehicle and depresses the brake pedal*1 or clutch pedal*2 while carrying the electrical key transmitter sub-assembly, the certification ECU (smart key ECU assembly) recognizes that the brake pedal*1 or clutch pedal*2 is depressed and sends an electrical key transmitter sub-assembly certification request signal 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 electrical key transmitter sub-assembly is inside the vehicle.
    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 entry key indicator light in the combination meter assembly illuminates in green.
    
    When the indicator illuminates in green 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 IG1 and IG2 relays 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 steering lock actuator with power.
    
    Then the steering lock ECU (steering lock actuator assembly) confirms that the certification ECU (smart key ECU assembly) is the proper ECU and drives the steering actuator motor until the steering lock is unlocked.
    
    After the steering lock is unlocked, the steering lock ECU (steering lock actuator assembly) sends an unlock completion signal to the certification ECU (smart key ECU assembly).
    
    When this signal is received, the certification ECU (smart key ECU assembly) sends an immobiliser unset command signal to the SFI system.
    - *1: for Automatic Transmission
    - *2: for Manual Transmission