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A common fault is a broken wire inside the rubber bellows between the door & the A post. The frequent flexing will eventually fracture a wire - often inside the insulation so not immediately obvious.
With the door panel off you have access to the connector at the motor. !2V + & - makes it move one way, swap to 12V - & + to move the other way.
With the door panel off you have access to the connector at the motor. !2V + & - makes it move one way, swap to 12V - & + to move the other way.
