You could also have a loose or dirty wiring harness connector, most likey
the one that connects to the door and window controls inside the door. The
other possible issue is a bad ground.
Cheers - Jonathan
My brother inlaw that owns a body shop claims most problems to doors can be
traced to the wiring that is exposed between the body and the door...it gets
weak by over stressing over time and breaks. It's an easy check, simply move
the plastic covering aside.
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