I just replaced a heated seat cushion element in my 03 supercrew.
You need to ohm out both elements to figure out if it's the cushion element or the back element, they are wired in series so if one gets a break, neither will work.
You can get a wiring diagram from autozone.com.
Just remove the seat from the truck, remove the cover, and replace the bad element (they are a plug in unit).
You will need a set of hog ring pliers and four hog rings to reinstall the seat cushion cover.
The hardest part was for the life of me, I couldn't figure out how to remove the lumbar support ****, made it a bitch to get the cover back far enough
with that **** still on it.
You will need a t50 torx plus socket (not a regular t50 torx) to remove the seat bolts. The element was about $30.
Last edited by hotrozz; 02-20-2010 at 02:39 PM.