Question about 2000 Pontiac Montana
I had a 99 with the same problem, and suggest you check under the passenger side front carpet. Remove the flat door kick plate, lift up the carpet on the front passenger side floor and you will see a large wiring harness running along the floor, wrapped in black tape. Water and salt gets into this harness and will rot out several wire splices that you will see. Look for wires that run from 2 wires down into one (under black tape.) These are spliced together, and rot out. There was several large gauge wires/splices(windows up and down) and I think 2 very thin wires/splices (lock/unlock) . Even if the wires look connected, give them a good tug, they will come apart and be green with corrosion. This is a very common problem and worth the effort to check out. Repairing these splices fixed both the power windows and locks at the same time. Good luck
Posted on Aug 15, 2009
Like i said in other post, 95% of the time the left hand power window switch is the problem. simply pry the trim off from the pointy end of it and change switch.
Posted on Jul 17, 2009
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Posted on Jan 02, 2017
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