04 Sierra - heated seats not working!

The heated leather seats just stopped working! When I press the button, the lights come on, it feels like the seat is starting to warm up, but then the lights go out by themself! Same problem on both driver side and passenger side. Same problem when low, medium, or high heat is selected. Would it be the element since both sides are suddenly doing the same thing and since there is a little heat given off before the lights go out?
Any help or advice would be appreciated!