If there is no indication of sound or movement when you press the button,
then it could be a fuse.

If you hear the motor or other mechanical sounds and the widow does not come
up, then the glass has probably come loose from the mechanism, which will
require getting into the door to repair.  I think...but am not sure...that
the glass is glued in to the bottom lift frame.  (Haven't had this problem
myself...or seen an explanation of the procedure.

Possible help from www.pelicanparts.com  or  www.rennlist.com

Hope this is of some assistance.

Regards from Texas.