ENGINE IMMOBILISER SYSTEM (w/ Entry and Start System) SYSTEM DESCRIPTION

ENGINE IMMOBILISER SYSTEM DESCRIPTION

1. The immobiliser system is a theft deterrent system that determines whether to disable starting of the SFI system or ECD system based on a comparison of the key ID code and the vehicle pre-registered code. The immobiliser system compares the vehicle certification ECU 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 or ECD system cannot be started. The certification ECU manages communication with the ECM, power management control ECU (for 1KR-FE and 1NR-FE) or power source control ECU (for 1ND-TV) steering lock ECU and ID code box. When the ID codes of the transponder chip and certification ECU match, the certification ECU authorizes the SFI system or ECD system to start.

FUNCTION OF MAIN COMPONENTS

SYSTEM FUNCTION

1. Using the entry function

   
   

   1. When the driver (or passenger) is sitting in the vehicle while carrying the key and the engine switch is pressed while the brake pedal is depressed (for Continuously Variable Transaxle) or clutch pedal is depressed (for Manual Transaxle), the power management control ECU (for 1KR-FE and 1NR-FE) or power source control ECU (for 1ND-TV) recognizes that the engine start operation has occurred and sends a certification request signal to the certification ECU. Upon receipt of the certification request signal, the certification ECU 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 vehicle. 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 analyzes the code. If the interior certification passes, then the power management control ECU (for 1KR-FE and 1NR-FE) or power source control ECU (for 1ND-TV) sends a certification pass response signal. When the power management control ECU (for 1KR-FE and 1NR-FE) or power source control ECU (for 1ND-TV) 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 checks that the power source mode has been changed and sends a steering lock command signal to the power management control ECU (for 1KR-FE and 1NR-FE) or power source control ECU (for 1ND-TV). After receiving this signal, the power management control ECU (for 1KR-FE and 1NR-FE) or power source control ECU (for 1ND-TV) supplies power to the steering lock actuator. Then the steering lock ECU confirms that the certification ECU is certified (via the ID code box) 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. Upon receipt of this signal, the certification ECU sends an unset command signal to the ID code box. Once this signal is received, the ID code box confirms that the certification ECU is certified and sends an immobiliser unset command signal to the ECM.

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

   
   

   1. When the driver is sitting in the vehicle while carrying the key and depressing the brake pedal (for Continuously Variable Transaxle) or depressing the clutch pedal (for Manual Transaxle) the power management control ECU (for 1KR-FE and 1NR-FE) or power source control ECU (for 1ND-TV) recognizes that the stop light switch (for Continuously Variable Transaxle) or clutch start switch (for Manual Transaxle), is on and sends a key confirmation request signal to the certification ECU. Upon receipt of this signal, the certification ECU 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. Upon receipt of the ID code, the code is analyzed. If the certification passes, a key certification pass response signal is sent to the power management control ECU (for 1KR-FE and 1NR-FE) or power source control ECU (for 1ND-TV) while simultaneously sending a sound buzzer request signal to the meter ECU. When the power management control ECU (for 1KR-FE and 1NR-FE) or power source control ECU (for 1ND-TV) 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 checks that the power source mode has been changed and sends a steering lock command signal to the power management control ECU (for 1KR-FE and 1NR-FE) or power source control ECU (for 1ND-TV). After receiving this signal, the power management control ECU (for 1KR-FE and 1NR-FE) or power source control ECU (for 1ND-TV) supplies power to the steering lock actuator. Then the steering lock ECU confirms that the certification ECU is certified (via the ID code box) 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. Upon receipt of this signal, the certification ECU sends an unset command signal to the ID code box. Once this signal is received, the ID code box confirms that the certification ECU is certified, sends an immobiliser unset command signal to the ECM, to the power management control ECU (for 1KR-FE and 1NR-FE) or power source control ECU (for 1ND-TV).