I have a similar issue and I took the door harness and body harness apart and found two contacts in the harness plugs corroded to the point of being gone. Just to be sure this is what caused my non-working door lock and window I connected the missing leads with jumper wires and everything started working again.

Now I just need to figure out which pins to order to fix things!

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2013 X5 xDrive3.5i Premium
2002 530I Sport Package
2001 X5 4.4i
2001 M3