Antitheft and Alarm Systems: Description and Operation
System Components:
SYSTEM OUTLINE
When the theft-alarm system has been armed by a fixed sequence for locking the doors, if thereafter any door, the rear hatch or the hood is opened in an unauthorized way, the horn will sound intermittently for a period of approximately three minutes, and, at the same time, the headlights will flash on and off, thus providing audible and visual warning signals.
Furthermore, the starter circuit is interrupted in such a way that the engine cannot be started, if the ignition key is not used. Note that this system is controlled by the electronic control unit (ECU) as one function of the Electronic Time and Alarm Control Systems (ETACS).
This ECU includes an independent (separate from the control of the other ETACS functions) microcomputer for the exclusive use of the theft-alarm system. This microcomputer arms, disarms, activates and deactivates the alarm system.
The system is composed of the components described below.
Inputs
^ Ignition switch Armed or disarmed condition (ACC or ON)
^ Door switch (left and right) Armed or activated condition
^ Door lock actuator switch (All doors) Armed or disarmed condition
^ Door switch (All doors) Armed or activated condition
^ Hood switch Activated condition
^ Rear hatch switch Activated condition
^ Key cylinder unlock switch (left and right door) Disarmed or activated condition
^ Key cylinder unlock switch (Rear hatch) Deactivated condition
Output
^ SECURITY light Indicates armed condition.
^ Horn relay Activates theft-alarm horn when activated.
^ Passing relay When activated, this relay activates the passing control relay for raising the headlights, activates the headlight relay, and turns on the headlights.
^ Starter inhibitor relay Opens starter circuit, making starting impossible, when activated.
OPERATION
Arming The System
After the following procedures have been completed, the SECURITY light illuminates for about 20 seconds. and when illumination stops, the system is armed.
1. Pull out the ignition key from the key cylinder.
2. Open a door. (The other door is closed.)
3. Use the keyless-locking method to lock the door. (The central door locking system will then function to lock all doors.)
NOTES:
1. The system is not armed, and therefore does not function, if the key is used to lock the doors.
2. Even after the system has been armed, if the key is used to open the rear hatch, the system will not be activated; when the rear hatch is then closed, moreover. the system will be armed.
3. In order to prevent the system's alarm from being accidentally activated by someone remaining in the vehicle, the system is disarmed when, while the SECURITY light is illuminated, a door is unlocked.
4. If a door is locked by the keyless method but. in error, a door is not completely or securely closed, the system will be disarmed. If this happens, the doors must be locked once again by the keyless method.
5. If the doors are locked while a door is not closed completely, the SECURITY light will go out after 20 seconds. but the system is not armed. If this happens, the doors must be locked once again by the keyless method.
6. If a door is unlocked with the key while the SECURITY light is illuminated, the system will not be armed.
Disarming The System
1. The system will be disarmed if the key is used to unlock a door.
2. If the system is armed while the driver is still in the vehicle. the system can be disarmed by inserting the ignition key and turning it to the ACC or ON position.
NOTE: Except when the key is used to unlock the rear hatch, once the system has been disarmed, it cannot be re-armed except by following the arming sequence.
Activating The Alarm
1. If an attempt is made to open a door, the rear hatch or the hood, without using the key, while the system is armed, the~horn will sound intermittently and the headlights will flash on and off for approximately three minutes. Furthermore, the starter circuit is interrupted at this time also, making starting of the engine impossible.
2. If a further attempt at forcible entry is made after the first three-minute alarm has finished, the three-minute alarm will be activated again.
NOTES:
1. The interruption of the starter circuit will be maintained, once the system has been activated, until it is deactivated. If, however, the key is used, starting is possible even if the alarm is not deactivated.
2. An alarm start initiated by an opening of the rear hatch or the hood is limited to when all doors are closed and locked, or the second unauthorized entry after the alarm has occurred one time.
Deactivating The Alarm
The alarm is deactivated and the system is disarmed when a door or rear hatch is unlocked with the key.
NOTE: Once the alarm has started, the system cannot be deactivated even if the ignition key is turned to the ACC or ON position.
Checking The System Operation
The activation/operation of the system can be checked by following the steps below.
1. Turn the ignition key to the ON position and then use the power-window switch to fully open the window at the driver's seat side.
2. Turn the ignition key to the LOCK position and then remove the key from the ignition.
3. Open only the driver's door, and close all the other doors, as well as the hood and the rear hatch.
4. Lock the driver's door by the keyless lock method.
5. All doors will then be locked, and the SECURITY light (within the combination meter) will illuminate; check to be sure that illumination stops in about 20 seconds.
6. After about two seconds have passed after the SECURITY light illumination stopped, reach through the window of the driver's door, pull up the lock lever to unlock the door, and then open the door.
7. Check to be sure that, when the door is opened, the horn starts sounding and the headlights flash on and off.
8. To stop the alarm, insert the key into the door's key cylinder and turn the key to the unlock position. NOTE
To check the alarm for the opening of the rear hatch or hood, open the rear hatch (or the hood) by using the remote rear hatch release lever (or the hood release lever), located at the driver's seat side either before the alarm is activated by the opening of a door, or after the finish of the first three-minute alarm.