DWA alarm triggering (alarm-trigger signal)
WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2006 BMW Z4, 2006 BMW M3, 2006 BMW M Roadster, 2006 BMW M Coupe, and 2006 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.
The DWA alarm is triggered if an alarm status is detected while the alarm system is activated. The following will trigger the DWA alarm:
- Forced opening of a door: Bus signal from door module (door contact)
- Forced opening of boot lid: Bus signal from body basic module (boot-lid-contact switch)
- Forced opening of bonnet: Bus signal from Car Access System (CAS) (bonnet-contact switch)
- Movement in interior: signal from microwave sensors
- Vehicle in inclined position: signal from tilt alarm sensor
- Open circuit in sub-bus (between the alarm system control unit in the emergency power siren and the microwave sensors)
- Undervoltage, overvoltage, car battery monitoring (positive and negative cables)
When a DWA alarm is triggered, the DWA control unit activates the emergency power siren loudspeaker. At the same time, the DWA control unit transmits an alarm signal through the K-CAN. The light module activates the visual alarm via the lighting system.
The emergency power siren may also trigger an acoustic alarm if the anti-theft alarm is active and the emergency power siren is separated from the vehicle electrical system by manipulation (inbuilt power supply from batteries).
The DWA alarm is interrupted immediately under the following conditions:
- Anti-theft alarm is deactivated
- Message "Key in ignition lock" (from CAS) and terminal 15 ON