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Engine Immobilizer System





ENGINE IMMOBILIZER: ENGINE IMMOBILIZER SYSTEM: SYSTEM DIAGRAM





Communication table:









SYSTEM DESCRIPTION

1. ENGINE IMMOBILIZER SYSTEM DESCRIPTION

(a) The engine immobiliser system determines whether or not to disable starting of the hybrid control system based on a comparison of the key's ID code and the vehicle's pre-registered code. The engine immobiliser system compares the vehicle certification ECU's pre-registered ID code with the key-embedded transponder chip's ID code. If the ID codes do not match, the engine immobiliser system activates and the hybrid control system cannot be started. The certification ECU manages communication with the hybrid control system, main body ECU (driver side junction block), steering lock ECU and ID code box. When the ID codes of the transponder chip and certification ECU match, the certification ECU authorizes the starting of the hybrid control system.

2. FUNCTION OF MAIN COMPONENT





3. SYSTEM FUNCTION

(a) Using the entry function

(1) When the driver (or passenger) is sitting in the vehicle while carrying the key, and the brake pedal is depressed while the power switch is pressed, the main body ECU (driver side junction block) recognizes that the hybrid control system 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 through the glass antenna to the door control receiver. Upon receipt of the ID code, the certification ECU analyzes the code. If the interior certification passes, the main body ECU (driver side junction block) receives a certification pass response signal. When the main body ECU (driver side junction block) receives this signal, the ACC relay is switched on and the IG1 and IG2 relays are switched on in sequence after 0.025 seconds. At this time, the power switch indicator 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 main body ECU (driver side junction block). After receiving this signal, the main body ECU (driver side junction block) supplies power to the steering lock actuator. Then (via the ID code box) the steering lock ECU confirms that the certification ECU is certified and drives the steering actuator's motor until the steering lock is unlocked. After unlocking the steering lock, 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 hybrid control system and certification ECU sends a security indicator light off signal to the front multiplex network door ECU LH and RH.

(b) Not using the entry function (when battery is depleted, affected by wave noise, etc.)

(1) When the driver is sitting in the vehicle while carrying the key and the brake pedal is depressed, the main body ECU (driver side junction block) recognizes that the stop light switch is on and sends a key confirmation request signal to the certification ECU. Upon receipt of this signal, the certification ECU drives the motor of the power switch's built-in immobiliser amplifier. At this time, the power switch outputs an RF (Radio Frequency) wave communication signal. If the driver holds the key up to the power switch at this time, the key receives the immobiliser RF (Radio Frequency) wave signal and responds by sending a radio wave signal. When the power 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 main body ECU (driver side junction block) while simultaneously sending a sound buzzer request signal to the meter ECU. When the main body ECU (driver side junction block) receives this signal, the ACC relay is switched on and the IG1 and IG2 relays are switched on in sequence after 0.025 seconds. At this time, the power switch indicator 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 main body ECU (driver side junction block). After receiving this signal, the main body ECU (driver side junction block) supplies power to the steering lock actuator. Then (via the ID code box) the steering lock ECU confirms that the certification ECU is certified and drives the steering actuator's motor until the steering lock is unlocked. After unlocking the steering lock, 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 hybrid control system and certification ECU sends a security indicator light off signal to the front multiplex network door ECU LH and RH.
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