DWA Control Unit

The software for the DWA is integrated in the emergency power siren. The DWA control unit in the emergency power siren controls the anti-theft alarm.

The microwave sensors are connected to the alarm system control unit by a single-wire bus (K-Bus). The DWA control unit is connected to the K-CAN.

• After the DWA has been activated, and after all doors and flaps have been closed, the microwave sensors start to monitor the interior. The interior can be monitored after approximately. 20 seconds.
• The monitoring of the interior is interrupted if the side windows and/or the sliding/tilting sunroof are closed using the convenience closing function.

Like the interior monitoring, the tilt monitoring does not start until the doors and hatches are closed. When it is activated, the tilt alarm sensor first conducts a 30 second long reference run. Tilt monitoring does not start until the reference run has been completed.

If the luggage compartment is opened during the reference run, the reference run is interrupted. The reference run is then restarted when the luggage compartment is closed again. The monitoring function of the microwave sensors and the tilt alarm sensor have priority. If a faulty door or hatch contact is detected, this will automatically be assumed to be closed.

The anti-theft alarm system is deactivated when the central-locking system is unlocked. The DWA LED stops flashing and the hazard warning lights flash twice as a visual confirmation. Depending on the national version, a short acoustic warning tone (dual tone) may also sound from the emergency power siren.

The boot lid can also be unlocked and opened with the remote control without the alarm being triggered, even if the alarm system is activated. When the boot lid is opened, the interior and tilt monitoring functions are deactivated. The interior monitoring and tilt monitoring are reactivated as soon as the boot lid is closed again.