When it won't move, do you hear the relay click? If not, your problem is with the switch or the relay. If it does click, your switch is working, but it could still be the relay or the motor. Either way, the relay is a possibility, so to find out, switch out the relay with another (non-critical) relay of the same color in the fuse panel. If the problem resurfaces, it's not the relay. Pull the door panel and check the connector to whichever item the "click" test points to...if the connection is good, replace the component. I hope this isn't too confusing.
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