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This happend to another guy about a year or so ago. The problem turned out to be in the wiring harness that goes through the A piller and into the door. You have to remove all the covering to expose the wires. I'm trying to remember if it was corosion in a plug or broken wires. Maybe someone else on here will remember it. May have to do an advanced search to find it. I remember that it was Tylus that knew about it and was telling the guy where to look. He posted pictures too.