Function
Function
Activation
With the remote control
When the upper electronic module (UEM) receives a locking command, it sends a command to the rear electronic module (REM). The rear electronic module (REM) first engages central locking and then activates the alarm. The alarm LED will begin to flash directly after system activation. However, the rear electronic module (REM) will disregard signals from the mass movement sensor module (MMS) and the inclination sensor module (ISM) until 25 seconds have transpired or after deadlock mode has been engaged by the central locking function.
For more information on the central locking function, see Design and Function, Central Locking.
With the key
An alarm activation function for a vehicle that is locked with the key is available in certain markets. In this case, a locking command is sent to the rear electronic module (REM) from the driver door module (DDM) when a switch in the driver's door lock cylinder is actuated. When the rear electronic module (REM) has engaged the central lock, the alarm is activated. This function is controlled by the vehicle configuration file which is stored in the central electronic module (CEM).
For more information on the central locking function, see Design and Function, Central Locking.
With the interior central locking switches
The alarm can be activated after an interior central locking switch has been used to engage the central locking in vehicles that are configured for a dual stage central locking function. The vehicle will be fully protected approximately 25 seconds after the last door is closed.
For more information on the central locking function, see Design and Function, Central Locking.
Passive activation
There is a passive activation function available on the Belgian and Israeli markets. After a driving cycle has been completed (ignition on, engine running, ignition off), the driver's door has been opened and closed and the ignition key is in position 0, 1 or removed, the alarm will be activated after approximately 1.5 minutes. Depressing the reduced alarm switch and depressing the remote control unlocking button within 5 seconds deactivates the function. The function is deactivated for 24 hours.
Triggering the alarm
If the alarm is in active mode and the rear electronic module (REM) receives an indication from a directly connected sensor or the upper electronic module (UEM), a so-called alarm cycle will be initiated. The rear electronic module (REM) sends a siren activation command to the upper electronic module (UEM). At the same time, the rear electronic module (REM) sends a direction indicator lamp activation command to the central electronic module (CEM). The siren sounds for a period of approximately 25 seconds and then stops. The light signal will continue for an additional 4.5 minutes.
When the siren has stopped, the rear electronic module (REM) will carry out a check of the sensors that should be active in the vehicle. If the sensors are OK, the alarm will be reactivated. Should a fault occur in one of the sensors, it will be ignored by the rear electronic module (REM) during reactivation. Subsequently, the alarm can once again be triggered if required. The function for alarm re-triggering is market-dependent.
Deactivation
In order to deactivate the alarm, the vehicle can be unlocked with the remote control. The rear electronic module (REM) receives a request for alarm deactivation from the upper electronic module (UEM) if the upper electronic module (UEM) receives an unlocking command from the remote control.
Note! This means that if a locked vehicle with an activated alarm is then unlocked with the ignition key instead of the remote control, the alarm will be triggered. Exceptions include a vehicle with an activated function for alarm activation and deactivation with the key.
The alarm function can also be deactivated locally if the trunk lid/tailgate unlocking button on the remote control is depressed. In this case, the rear electronic module (REM) disregards signals from the switch indicating an open trunk lid/tailgate in the trunk lid/tailgate lock unit. The inclination sensor module (ISM) and mass movement sensor module (MMS) will also be deactivated temporarily. The vehicle alarm is reactivated once the hatch is closed.
The alarm can also be deactivated if an approved key is inserted in the ignition switch and is turned to position II.
Resetting the alarm
If the alarm has been triggered, it can be reset in two ways; by depressing the unlocking button on the remote control or by turning the ignition key to position II.
Reduced alarm function
The switch for reduced alarm function is located in the climate control comfort panel. The switch is used to temporarily deactivate the inclination sensor module (ISM), mass movement sensor module (MMS) and deadlock mode when the vehicle is locked. An integrated LED in the switch indicates when the function is activated.
The function is activated during a locking cycle, i.e. from the time the button is depressed and the vehicle is locked until the vehicle is unlocked. When the ignition is once again turned to position II, reduced function is deactivated.
Examples of applications for this function include when a person or pet remains inside the vehicle after the vehicle has been locked, and if the vehicle is transported by tow truck or onboard a ferry.