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Start with checking the fuses and then the wiring leading into the door. Make sure you have power first. You may have to remove the door panels to test the motor. Make sure the motor has power. If their is power going to the motor but the motor doesnt work, the motor itself may be dead. Other possibilities include the regulator, the comfort relay, or the switch themselves.
You can try resetting the windows. You need to close all the doors, and raise the window and once it stops, keep holding the switch in the up position for an additional 5 seconds.
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