Functions of the Alarm System

Functions of the alarm system

- Monitoring of the outer shell of the vehicle via contact switches.
- Attempted break-ins are detected and indicated by audible and visual signals.
- The alarm horn, alarm siren (country regulations) and interior lights are activated for alarm output. The system can be enhanced by connecting additional sensors (glass breakage sensor, tilt sensor).

Functions of the central locking system
Unlike previous systems, a two-motor lock is used here.

- Locked motor
- Safe motor

The locked motor switches the central locking system from unlocked to locked and vice versa.

The safe motor switches the central locking system from locked to safe and vice versa.

The central locking system has three different locking conditions:

- Action 1. If the lock is actuated once, the so-called 'Safe locking - door secured' function is activated. The doors can be opened only with the key, but not with the inside door handles.
- Action 2. If the door lock is actuated twice within 1 second, the vehicle is not accessible from the outside, but can be unlocked using the inside door handles.
- Emergency locking. Emergency locking is triggered by actuating the door lock three times and represents an emergency function. If the functional capability of the overall system is impaired because, for example, one door cannot be closed, it is still possible in this way to activate the other security functions. Point 1 is activated when the system is operated via the hand-held transmitter. The position of the doors is checked by limit switches in the lock.

The conditions for a locking process from Unlocked to Locked are listed in the following table.

Unlocked --> Locked






The conditions for a locking process from Unlocked to Safe are listed in the following table.

Unlocked --> Safe









The conditions for a locking process from Locked to Safe are listed in the following table.

Locked --> Safe






The conditions for a locking process from Safe to Locked are listed in the following table.

Safe --> Locked









The conditions for a locking process from Locked to Unlocked are listed in the following table.

Locked --> Unlocked





The conditions for a locking process from Safe to Unlocked are listed in the following table.

Safe --> Unlocked






System test
All components of the alarm system (except for terminal 15) can be checked for operation under the 'System test' menu item. During the system test, a bar runs across the screen, and if, for example, the oddments tray is opened, an alarm is triggered. This alarm output differs from the usual alarm output in that the alarm horn is activated only for a short time. The alarm output is accompanied by interior lighting and direction indicator lights.

NOTE: The function of the passenger compartment monitoring sensor can be checked under the "Passenger compartment monitor" menu item. When movement is detected in the passenger compartment, the alarm horn is activated briefly while the interior lighting and direction indicator lights go on continuously.

Undervoltage
If the battery voltage falls below 8.5 V, an undervoltage occurs. If the battery voltage exceeds 9 V, the undervoltage is no longer present. If an undervoltage occurs, the inputs Door lock barrel open and Door lock barrel closed are evaluated as inactive irrespective of their state. It is not possible to activate the central locking system via the door lock barrel when an undervoltage occurs. The alarm system cannot be activated in the event of an undervoltage.

Load disconnection
If the vehicle is locked up, some loads are disconnected from the supply voltage in order to conserve the battery. Load deactivation is activated if at least one of the following requirements is fulfilled:

- 10 minutes after locking up the vehicle via hand-held transmitter or door lock as well as after re-locking.
- 2 hours after pin 86 S is switched off.
- 2 hours after the central locking system is unlocked via door lock or hand-held transmitter.
- 2 hours after alarm output.

Load disconnection is deactivated if at least one of the following requirements is fulfilled:

- Pin 86 S is switched on.
- Pin 15 is switched on.
- A valid transponder is detected.
- The vehicle is unlocked or locked via hand-held transmitter or door lock.
- A door is opened.
- Alarm output.

Behavior in the case of servicing
When removing:

- vehicle battery
- alarm siren
- alarm control centre

an activated tilt sensor will trigger an alarm. In order to carry out servicing work, the alarm siren must be switched off before starting the work. To switch it off, insert the vehicle key with valid transponder into the ignition lock and rotate to actuate the buzzer contact. Components can be removed without triggering the alarm as long as the vehicle key remains inserted.

Lid release locking
Electric locking is carried out by the alarm system control module and is valid for the following country codings:

- USA
- England
- Belgium

Functioning can be checked under 'Tank locking' in the Drive links menu item. This locks not only the tank cap but also the front and rear lid release.