what happens when you put your hand in as the window rolls up?
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From: Nashville, TN
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tried it when I got my X5 because i figured that my kids would explore. it is not painful at all on your arm. You can push the pressure strip to make it go back down on its own to.
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From: Birmingham, AL
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So it is in fact a pressure sensor located at the top of the window frame? I figured it would be an overcurrent sensor in the window motor...but I really have no idea how they actually do it. I would also recommend using a towel or the like to test this function. I also wonder if this system has a fail safe design...such that if it is not working, you get some kind of warning/message. I would bet that the window motor could indeed cut off a finger(s) before it stalled...especially for a child.
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From: North Jersey
My Ride: 2004 525i
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Back when I was little my grandma closed the windows of her e34 while I had my hand sticking out. Lost a fingernail to that one. 
Glad to hear they have sensors now ahah.
Glad to hear they have sensors now ahah.
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From: Encino, CA
My Ride: 04 545i - Titanium Silver/Black, Sport pkg, Comfort Seats w/ Lumbar, Premium Sound, power rear sunshade, Adaptive Xenon Headlights, Steptronic, Park Distance Control, Fold down rear seats w/ski bag, Aux jack, 6-disk changer, puddle lamps...
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So it is in fact a pressure sensor located at the top of the window frame? I figured it would be an overcurrent sensor in the window motor...but I really have no idea how they actually do it. I would also recommend using a towel or the like to test this function. I also wonder if this system has a fail safe design...such that if it is not working, you get some kind of warning/message. I would bet that the window motor could indeed cut off a finger(s) before it stalled...especially for a child.
The latter would be correct. The window travel is a 'learned' process (search +"window" +"anti-trap"). The motor control unit detects increased resistance (hall-effect sensors are used), and will reverse motor travel.
Read HERE about how the system works, the "Emergency" and "Panic" overrides, and other info related to your power windows
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From: Houston, Texas
My Ride: 2005 BMW 545i, Silver Grey, Sport Package, R. Shades, Cold Pkg, Sat. Rad., Prem. Sound.
Actually, try it with your neck and report back! The neck has more muscle and therefore stronger than your arm or fist. 
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From: Cerritos, CA
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I dred to think if my little girl would stick her head out and some how accidentally roll up the window, i would think it would snap the neck?? I just have the window locks on all the time.
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From: New York
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From: Austin, TX
My Ride: 545i sport
Model Year: 2004
Well, it appears I may be wrong on the E60. Both my E38 and E46 have the pressure sensors all along the door window frames. So, I assumed the E60 was the same, my mistake.
I know the sunroof have operated on the "resistance" principle for some time, so no reason the windows cannot operate on the same principle.
I know the sunroof have operated on the "resistance" principle for some time, so no reason the windows cannot operate on the same principle.