Emergency function for acoustic DWA alarm
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.
If the emergency power siren fails during an alarm, or if the sub-bus to the microwave sensors is interrupted, the acoustic alarm will be emitted through the fanfare horn. To do this, the DWA control unit transmits a message to the steering column switch cluster (SZL).