Tried it today by leaning in the window and waving my arm around, but the alarm didn't go off. Maybe there is some conditional logic at work here, as suggested by E90Fleet.
Let us know what you find out Wild M.
EDIT: In fact the manual states "The windows and glass sunroof must be closed for the system to function properly". Therefore our test through an open window would probably never have worked because it reads as if the motion sensor might be disabled in that scenario.
Last edited by Raspartan; 05-06-2012 at 10:38 PM.
Reason: Added information from manual