Quote:
Originally Posted by upallnight
That extra area in question is for the ultrasonic sensor.
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Are there two different versions of the ultrasonic sensor/alarm? Mine goes ballistic if you reach through a window with the car locked and doesn't have that 5th opening. Loudest noise I've ever heard from a car alarm. Looks like the one below.
BMW E53 x5 Ultra Sonic Alarm Motion Sensor Module Interior Overhead | eBay