All about Ford Mondeo

Anti-theft alarm system - general information
Body electrical system / Anti-theft alarm system - general information


Note: From November 1993, for added security, a complex Bosch immobiliser system was fitted to some models. For further details, refer to your Ford dealer.

1 All UK models are fitted with an anti-theft alarm system, incorporating movement sensors and an ignition immobiliser. The system is activated when the vehicle is locked.

2 The system includes a start inhibitor circuit, which makes it impossible to start the engine with the system armed.

3 The movement sensors consist of two ultrasonic units, located in the УBФ pillars, incorporating transmitters and receivers (see illustrations). The receivers check that the echo frequency matches the original frequency. If there is any significant difference, the system triggers the alarm.

20.3A Disconnecting a movement sensor multi-plug
20.3A Disconnecting a movement sensor multi-plug

20.3B Removing a movement sensor
20.3B Removing a movement sensor

4 The system module is located on a bracket beneath the right-hand side of the facia. The set and reset switches are located in a housing by the lock barrel holder in the doors, tailgate or bootlid.

5 To allow temporary opening of the tailgate or bootlid, an inhibit switch is fitted to the lock barrel. This suppresses the alarm system until the tailgate or bootlid is closed again.

6 Where remote central locking is fitted, an infra-red receiver is located on the exterior door handle (see illustration). Note that excessive heat can destroy this receiver; therefore, it should be covered with aluminium tape if (for instance) a paint-drying heat process is to be used.

20.6 Infra-red receiver location on the door handle
20.6 Infra-red receiver location on the door handle

1 Receiver
2 Infra-red eye on the door handle

7 The alarm system is fitted with its own horn.

On Hatchback and Saloon models, it is located on the left-hand side of the luggage compartment; on Estate models, it is located on the right-hand side of the luggage compartment (see illustration).

20.7 Alarm system horn location on Hatchback and Saloon models
20.7 Alarm system horn location on Hatchback and Saloon models

8 The alarm system incorporates a self-test function, which can be activated by operating the bonnet switch or one of the lock position switches eight times within 10 seconds.

During the check, the horn or buzzer issues acoustic signals which should occur every time a door, bonnet or tailgate is opened. If the doors are double-locked, the signal will occur when something is moved within the passenger compartment. A more comprehensive test can be made using the Ford FDS 2000 diagnostic tester.

9 The door lock switches associated with the alarm system are located behind the door trim panels (see illustration).

20.10 Alarm system door lock switch  removal
20.10 Alarm system door lock switch  removal

1 Clips (arrowed)
2 Multi-plug


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