It could be possible that there is a corrosion issue at the connection in your door jamb. It probably won't reset on your own, so you'll need someone with a device to reset it.

Unless you have access to a device, this might be best left to the dealer.

That part is going to cost you $400...dealer might charge a 1/4 of that to find out it's not that part.

__________________
2005 x5 4.4i sport