My Buick Riveria has a problem with power windows as well. For the past few years they are inoperable because I the relay which is in the drivers side door stopped functioning. pull your door panel and follow they wires. It is located between the window control button and window regulator/motor(about the size of a pack of cigarettes). It functions for both windows but they can short out on one or the other or both. I took mine out to get the part number so I could purchase one and no one has access to obtaining the relay. Not even the dealers! You will probably have to find one in a salvage yard. I don't know what model you have but tell ya what, Riveria electrical and body parts are nearly impossible to find. There is probably a couple different year and models that are the same relay. Hope this helps out a bit.
Steve
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