DWA Alarm

DWA Alarm

If a triggering criterion is met when the DWA is armed, the alarm is generated both acoustically and visually.

Acoustic Alarm

After a triggering criteria is met, the DWA sends the telegram to the DWA K bus. The emergency siren acknowledges the alarm telegram.

If the DWA receives no confirmation from the SINE (siren), it repeats the alarm telegram up to 8 times. If it still receives no reply, the emergency operation horn (vehicle horn) is activated.

When the DWA is disarmed, the acoustic alarm is cancelled immediately and without acknowledgement.

Visual Alarm

The visual alarm is triggered at the same time as the acoustic alarm for a period of 5 minutes. The visual alarm is indicated by the hazard-warning lights flashing with the high beams.

This alarm cannot be extended by another trigger during the alarm cycle.

When the DWA is disarmed, the visual alarm is cancelled immediately and without acknowledgement.

Independent Alarm

If an attempt to manipulate one of the emergency siren wires is detected, an independent alarm is triggered by the siren.

If the DWA K bus is also disconnected, the interior sensor identifies this by the failure of the siren to reply and triggers a visual alarm.

Panic Alarm

The panic alarm allows the vehicle user to draw attention to a threat outside the vehicle or to an accident by generating an alarm.

The panic alarm can be activated by pressing the special panic function button on the Remote Control regardless of the state the DWA (armed/disarmed).




The alarm is not terminated by a time-out but can be stopped by pressing any button on the remote control. The alarm is not stored in the counter.

The DWA sends the alarm telegram every 33.5 s. When the panic alarm begins, the siren line monitoring function is started.

Monitoring takes place during the entire duration of the panic alarm. If a break in the wiring or a defect signal from the emergency siren is detected, the horn emergency operation function is activated.

The state of the DWA (armed/disarmed) is unaffected by the activation or the termination of the panic alarm. If a panic alarm is requested while a normal alarm is generated, the DWA immediately changes over to panic alarm mode. If an alarm trigger is detected while a panic alarm is generated, the panic alarm continues.

Vehicle Horn Emergency Operation Function

If the siren indicates a defect while an alarm is generated or if the DWA is unable to check the wiring to the siren, then the vehicle horn is activated.

A telegram is sent to the Steering Column Switch Center (SZL) every 500 ms. The time sequence of the alarm corresponds to the pulsing of the horn alarm.

On account of the time conditions which apply during line monitoring, a time delay of up to 2.3s can occur.

Alarm Abort

An alarm activated for test purposes or by accident can be terminated by disarming the DWA or by generating the telegram "status-key-inserted". The alarm is aborted immediately. The abort is not acknowledged acoustically or visually.