The problem is usually in the wiring that goes from the inner fender to the door.The constant twisting when you open the door will break some of the wires over time.You need to cut off the rubber covering and do a visual inspection of the wires,if nothing is fond then the door needs to come apart and the motor needs to be tested as well as power and ground to it.Also could be a faulty switch,let me know how you make out.
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