first, yeah, check youre getting 12v accross the terminals that connect to the window element.
then work accross each element wire/strip with a multimeter, making sure youve got no breaks in each one. if you do, you can get a conductive glass adhesive from pretty much any auto store. mask the window on either side of the element strip, and paint on the adhesive with a nail brush.
if the elements are all good, but still no action check continuity between the window terminals and the dash switch. and also make sure the switch is getting 12v and is functioning properly.