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All four windows do not work. Is there a master control that handles all of the windows?
This could be a problem with your door switch. See my other answer below. I'd hope it wasn't all 4 window regulators or motors
Common Problems > Buick Regal
Q&A > Buick > 1999 Buick Regal
Q&A > Buick > 1998 Buick Regal