Note: Since November 1993, a Bosh multifunctional immobilizer has been installed on some models to increase the level of protection against theft. Detailed information is available from dealers.
1. All UK models are fitted with a perimeter alarm system which monitors intrusion into the vehicle and includes an ignition immobiliser. The system protects all doors, bonnet and boot/tailgate. It is armed when the vehicle is locked. An interior alarm system with ultrasonic motion sensors is optional. On late Estate models fitted with this system, a rear screen breakage detector is built into the rear window.
2. The system contains a start-slowing circuit that prevents the engine from starting if the alarm system is armed. On late-production models with a passive anti-theft alarm system (PAAS), the power supply to the immobilizer circuit is disconnected by a signal from a transponder chip built into the ignition key. The PAAS circuit is separate from the alarm circuit, so the immobilizer protects the car even if the alarm is not installed.
3. On later models, the alarm system also protects the audio unit. If you try to remove it, the sound alarm is activated.
4. The PSPS transceiver unit is assembled around the ignition switch and reads the ignition key microcircuit code. Therefore, duplicate keys must be purchased from dealers.
5. The motion sensors of the alarm system monitoring the interior of the passenger compartment are installed on the middle pillars. Each of these sensors contains an ultrasonic unit, which includes a receiver and a transmitter (see Fig. 20.5, a, b). The receivers monitor the correspondence of the frequency of the reflected signal to the reference frequency. In the event of a discrepancy between these frequencies, the system switches on the alarm.
6. The alarm system module is integrated into the central locking system module, which is located on a bracket mounted under the front panel on its right side. On later models, the PSPS module is also installed there. The setting and reset microswitches are installed in the housing on the door, tailgate or trunk lid lock cylinder holder.
7. To temporarily open the tailgate or boot, a delay microswitch is installed on the lock cylinder. This prevents the alarm from functioning until the tailgate or boot lid is closed again.
8. If the car is equipped with a central locking system, its infrared receiver is installed on the outside door handle (see Fig. 20.8). Please note that this receiver may fail due to overheating. Therefore, when performing work related to heating (for example, when drying the car in a chamber after painting), it must be protected with aluminum foil.
9. The alarm system has its own sound signal. On the Sedan and Hatchback models it is installed in the luggage compartment on the left side, on the Station Wagon models - on the right (see Fig. 20.9, a, b).
10. The alarm system has a self-diagnosis function. Self-diagnosis is performed by pressing the bonnet microswitch or one of the lock position microswitches eight times within ten seconds. During this test, an audible signal or buzzer sounds whenever a door, bonnet or tailgate is opened. If the doors have a locking device, the signal will sound if anything moves inside the car. A full system check can be performed using the Ford FDS 2000 diagnostic tester.
11. The door lock microswitches included in the alarm system are installed under the door trim (see Fig. 20.11).
(This publication was borrowed from the website: FordBook.ru)