im guessing it has power windows?
its probably the window switch or the window motor behind the door panel inside the door. ive replaced quite a bit of GM window motors in my day.
fletchers tire and auto is an ok place, I used to work there, they have all kinds of coupons and discounts out there. I worked at the one on 67th happy valley and the one on carefree hwy. the other ones im not sure about being good. I think there is a fletchers on the east side.