Antitheft and Alarm Systems: Description and Operation
SYSTEM DESCRIPTIONThe engine immobilizer system has been designed to prevent the vehicle from being stolen. This system uses a transponder key ECU that stores the key code of the authorized ignition key. If an attempt is made to start the engine using a non-authorized key, the transponder key ECU sends a signal to the ECM to prohibit fuel delivery and ignition, effectively disabling the engine.
1. OUTLINE OF THEFT DETERRENT SYSTEM
- The theft deterrent system will operate when somebody attempts to forcibly enter the vehicle, unlock any door or luggage compartment door or open the engine hood or the luggage compartment door without using the key.
This system causes the lights to light up or blink and the horns to sound in order to deter break-in and theft.
- The theft deterrent system has 2 modes; one is the active arming mode (see ACTIVE ARMING MODE) and the other is passive arming mode (see PASSIVE ARMING MODE). The passive arming mode can be switched ON/OFF using the specified method.
- Each mode has 4 states; a disarmed state, an arming preparation state, an armed state and an alarm sounding state.
a. Disarmed state:
- The alarm function is not operating.
- The theft deterrent system is not operating.
b. Arming preparation state:
- The time until the system goes into the armed state.
- The theft deterrent system is not operating.
c. Armed state:
- The theft deterrent system is operating.
d. Alarm sounding state:
- Alarm function is operating.
Alarm time: Approx. 60 sec.
HINT: If any of the doors are unlocked when the key is not in the actuation area during the armed state, a forced door lock signal will be output.
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2. FUNCTION OF MAIN COMPONENT
3. ACTIVE ARMING MODE
HINT: Active arming mode starts the alarm control immediately after the doors are locked.
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a. Active arming mode:
This system activates as described in the diagram below when one of items for each condition is met.
4. PASSIVE ARMING MODE
HINT:
- This mode starts the alarm control after the key is out of the actuation area and doors are closed.
- This mode can be switched ON/OFF by the specified method.
- The alarm is initially set (when shipped from the factory) to active arming mode (not passive arming mode).
- During passive arming mode, the theft deterrent system goes into the armed state even if the doors are not locked.
- Detecting that the doors are unlocked does not set off the alarm during passive arming mode.
- A forced door lock signal is not output during passive arming mode.
- Although the theft deterrent system detects that the doors are opened during passive arming mode, the alarm will not go off immediately because an entry delay time is set.
- If the condition (1) of active arming mode is met during passive arming mode, the theft deterrent system will switch to active arming mode.
- With all doors and engine hood closed, lock all doors by key operation.
- With all doors and engine hood closed, lock all doors by wireless operation.
- With any door or the engine hood open, lock all doors and close all doors and engine hood.
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a. Passive arming mode: This system activates as described in the diagram above when one of items for each condition is met.
5. FORCED DOOR LOCK CONTROL
a. The forced door lock control prevents the vehicle from being tampered with. Immediately after a door is unlocked (alarm starts), the door is forced to lock by a forced door lock signal.
1. Conditions that force the doors to lock: When the key is not in the actuation area and both of the following conditions are met.
- The theft deterrent system is in the alarm sounding state of active arming mode.
- Any door is unlocked.
6. ALARM MEMORY FUNCTION
a. If the alarm is set off (tampering is detected) while the theft deterrent system is armed, it will be recorded by the alarm memory function. Whenever the theft deterrent system is cancelled, the alarm memory function causes the taillights to light up for 2 seconds in order to inform you that the alarm has been set off.
1. Conditions of the alarm memory function that cause the taillights to light up:
When the theft deterrent system has entered the alarm sounding state (tampering has been detected) even once, the taillights will light up for 2 seconds if any of the following conditions is met.
- Switched to the disarmed state from the armed state during active arming mode.
- Switched to the disarmed state 1 from the armed state during passive arming mode.
HINT:
Active arming mode: See ACTIVE ARMING MODE.
Passive arming mode: See PASSIVE ARMING MODE.
7. PANIC ALARM CONTROL
a. The panic alarm control makes it possible to voluntarily set off the panic alarm by pressing the PANIC switch on the wireless transmitter.
1. Conditions that cause the panic alarm control to set off the panic alarm:
The panic alarm control sets off the panic alarm by pressing the PANIC switch on the wireless transmitter under the following conditions:
- The engine switch is off.
- The theft deterrent system is not in the alarm sounding state. (This condition is common both to active arming mode and to passive arming mode.)
2. Conditions that cause the panic alarm control to shut off the alarm:
The panic alarm control shuts off the panic alarm when any of the following conditions is met during panic alarm operation:
- The engine switch is turned on (IG).
- The panic alarm switch is turned on again.
- Any of the switches on the wireless transmitter (LOCK/UNLOCK or LUGGAGE OPEN) is pressed.
- The panic alarm ends (approx. 57 sec. have passed).
- The theft deterrent system switches to the alarm sounding state. Under this condition, the theft deterrent system is controlling the alarm rather than the panic alarm control. In order to cancel this alarm, refer to the theft deterrent system alarm sounding state cancellation procedure. (This condition is common both to active arming mode to passive arming mode.)
HINT:
Active arming mode: See ACTIVE ARMING MODE.
Passive arming mode: See PASSIVE ARMING MODE.
8. SECURITY INDICATOR OUTPUT
a. The certification ECU outputs a signal to light up the security indicator, according to the state of the theft deterrent system. However, some of the actual lighting conditions of the security indicator are different from the output signals of the certification ECU.