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.
Which relay is the starter relay on a 1994 buick lesabre
fuel pump relay location in 1994 buick lesabre
Location of fuel pump relay 1996 Buick Lesabre
Where do you find starter relay for 99 buick lesabre custom
where is the relay located on a 87 lesabre
Fuel pumps on buick lesabre
When you find that out,PLEASE let me know,OK?
The horn relay on a 97 Buick LeSabre is located at the front of the engine compartment, near the headlights. It provides power to the horn and triggers it when the button is pressed on the steering wheel.
looking for power window relay switch 1994 buick centry
The fuel pump relay on a 1996 Buick LeSabre can be found underneath the hood. The fuse will be in the fuse box.
NO relay just fuse.
where is the cooling fan relay in a 1996 buick lasebre