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E93 Complete Vehicle Workbook
Anti-theft Alarm System
The anti-theft alarm system in the E93 Convertible is identical to that in the 3 Series Sedan in terms of its basic functions and operating
mode. There are differences in the interior monitoring function and connection to the system network. Microwave sensors, as in the E64
Convertible, are used for the interior monitoring system instead of ultrasonic sensors.
The microwave sensors facilitate monitoring of the vehicle interior also when the convertible top is down. The microwave sensors have a
semicircular radiation characteristic. By strategic placement in the vehicle, the entire interior can be monitored without the microwave
sensors radiating outside the vehicle.
Four microwave sensors are used on the E93 Convertible for the purpose of monitoring the interior. The microwave sensors are connect-
ed via the DWA bus to the SINE (siren with tilt alarm sensor). The DWA bus is a sub-bus based on the K-bus. SINE is the master control
unit and is connected directly to the K-CAN. The entire control of the anti-theft alarm system is located in the SINE.
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