Description

Anti-Theft Alarm and Central Door Locking (CDL)

DESCRIPTION

General
The anti-theft alarm system is controlled by the Central Control Unit (CCU), which is mounted on the rear of the passenger compartment fuse box. The alarm can be armed and disarmed using the vehicle key or remote handset. The two main features of the alarm system are:
^ Perimetric protection.
^ Volumetric protection.

Perimetric Protection
Perimetric protection secures against intrusion through the bonnet, doors, tail door or roof. The CCU monitors the state of the hinged panels after the alarm system has been armed. If a panel is opened after the alarm has been armed, the alarm will be triggered.

Switches are incorporated into the door latch assemblies, the bonnet, and the tail door. Three door vehicles also have a 'roof on' switch, to inform the CCU if the hard back has been removed, or the soft back is opened.

Perimetric protection is initiated after a valid alarm request is received. If any panel is open when perimetric protection is activated (other than the roof), the alarm will enter a partially armed state.

Volumetric Protection
Volumetric protection provides protection for the vehicle interior. A volumetric sensor monitors the vehicle interior space and activates the alarm if unauthorized movement is detected. The volumetric sensor is located in a central position, behind the headlining.

A fifteen second delay is initiated after the alarm has been armed before signals from the volumetric sensor are interpreted as an intrusion. This precaution is included in the CCU software to avoid accidental or nuisance triggering of the alarm.