Alarm system

The alarm system (DWA) is equipped with an ultrasonic interior movement detector for monitoring of the passenger compartment. The ultrasonic interior movement detector is fully integrated in the roof function center (FZD).

The Front Electronic Module (FEM) controls the alarm system as follows:

• The door contacts are monitored by the Front Electronic Module (FEM). If the status of a hall effect sensor changes, the change is transmitted to the ultrasonic interior movement detector via the K-CAN2. The alarm is triggered by the emergency power siren if the alarm system (DWA) is activated.
• The Front Electronic Module (FEM) also monitors the engine compartment lid contact switch. The DWA alarm is triggered as soon as the status changes.
• The Rear Electronic Module (REM) monitors opening of the tailgate.