The Cadillac DeVille was originally a trim level and later a separate model produced by Cadillac. The first car to bear the name was the 1949 Coupe de Ville, a prestige trim level of the Series 62 luxury coupe.
@bmcgill could be the switch as well as the window regulator. You could try to jump the regulator once you remove the door panel etc. to see if it moves up. If so it is most likely the switch and vice versa.