While reading at lunch today trying to determine if mine has the engine immobilizer (another post), I was also reading about the alarm. It stated that the motion sensor in the vehicle is made to work with the windows up and sunroof closed and if they were left open you could possibly activate the alarm.

One thing to try is to deactivate the motion sensor and see if it still goes off. This is done by locking the vehicle with the remote and immediately hitting the lock button again. I have to do this occasionally when I have the dogs in the vehicle and stop for a few minutes somewhere - many times I forget to do this and within 5-10 minutes the car is wailing!!!

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2001 X5 3.0i (PP/WP/AP) Traded at 213K miles
RARE White on Black - Why does everyone get Tan??
First E53 with 215s on XOutpost!!