Antitheft System (DWA)

Antitheft System (DWA):

Functional Description:

The task of the antitheft system (DWA) in the E 31 is to detect attempts at breaking into, stealing or towing the vehicle to give acoustic and visual warning signals and to prevent the engine from being started by way of a starter blocking feature.

The antitheft system (DWA) is switched on and off (armed/disarmed) via the door locks or the infrared locking system.

The status LED lights after the antitheft system (DWA) has been armed (switched on).

If, at the start of the arming procedure, an element to be monitored is Not in its rest position, the status LED flashes (arranged on the centre console next to the automatic or gearshift lever) until the switch/element (trigger) assumes its rest status, after a maximum of 10 seconds (= flash time).

The trigger lockout time is started (approx. 10 seconds) after this time has elapsed. The trigger lockout time prevents unwanted alarms, e.g. by incorrectly closed doors.

No triggers are monitored during this lockout time. After the lockout time has elapsed, all triggers are included in the monitoring, the DWA is armed (switched on).

After the DWA has been armed, the status LED lights continuously for 36 hours. After this period, the LED goes out (power saving), however, the DWA is still armed.

If an alarm is triggered, an acoustic alarm is given (DWA horn) for a duration of approx. 30 s. A visual alarm is also triggered (hazard warning flashers/low beam light depending on country-specific variant).

Note: The DWA is armed and disarmed via the ZKE. The DWA is activated only when the corresponding ZV command is given. The DWA cannot be activated if the central locking system (ZV) is defective.

System Components:

The antitheft system includes the following elements:
DWA control unit
Status LED
Alarm horn
Switching elements

Further if equipped with interior protection/tilt alarm generator:
Auxiliary module with glass break sensors (glass break sensors at bottom end of window panes)

Tilt sensor

Scope of Functions:

The door locks or the infrared locking system are the operating elements.

Monitored components:
- Lock contacts, driver's and passenger's door
- Rear lid
- Driver's door
- Passenger's door
- Glove compartments
- Rear axle contact (towing the vehicle)
- Radio
- Engine start
- Disconnection/connection of battery
- Front lid

If equipped with interior protection and tilt alarm generator, also monitored:
- Vehicle tilt (towing/lifting)
- Driver's and passenger's window, left and right side windows, rear window (rear screen)

Locations: Control unit/auxiliary module/tilt sensor:

Control unit : Front right on door sill, near the A-post
Auxiliary module : Next to DWA control unit
Tilt sensor : Rear left luggage compartment