Operation index

Operation index

• DESCRIPTION
  - WIRING DIAGRAM
  - DESCRIPTION OF OPERATION
• COMPONENTS
  - COMPONENTS LAYOUT

DESCRIPTION

The intruder alarm system offers volumetric and perimeter protection.

An electronic control unit monitors the following:
- status of doors, boot and bonnet via switches in the locks (perimeter control)
- the presence of a moving object inside the passenger compartment, via volumetric sensors. (volumetric control)
- the condition of the system supply cables (both directly from the battery and those controlled by the ignition)
- the operation of ignition switch

The control unit is equipped with a self-test function which detects and memorizes faults in the control unit itself and the system components and also checks the condition of the connecting cables.

The control unit also memorizes the number of times the alarm is activated and set off.

The control unit operating software may be altered to meet regulations governing the use of alarm systems applicable in different markets.

The electronic control unit also incorporates the siren and the emergency key: it is located at the front, in the engine compartment, in front of the battery. The emergency key makes it possible to cut out the system, for example in the case of repair operations or if the vehicle is not used for long periods.

The receiver is an electronic device which receives the transmitter signal and incorporates the volumetric sensors: it is located in the front courtesy light. The volumetric sensors check that there are no intrusions in the vehicle: both are 'double' sensors, i.e. consisting of an emitter and a receiver: the wave transmitted by one of the two (emitter) is received by the other (receiver): otherwise an alarm signal it sent to the control unit.

The same switches as the central locking system are used to check the doors. There is a special switch in the bonnet lid lock, whilst the contact board connected to the tailgate cables is used to signal that the boot lid is open.

The deterrent LED in the steering column cover signals the status of the system (on, off, etc.) plus any faults.

For more detailsCharacteristic of working principle 5580E Anti-theft device .

The alarm system control unit has a direct supply protected by a fuse in the junction unit and the line controlled by the ignition is protected by the shunt fuse located near the i.e. control unit which also protects the injection system. The remote control receiver has direct supply lines and supply lines controlled by the ignition protected by two fuses located in the junction unit.