I don't have a sense of which part of that system fails more commonly. Maybe someone else can help with that. I can say that throwing parts at problems often ends up costing more in cash & time than a proper diagnosis. A dealer's diagnosis generally runs about 100 bucks. Then you can decide if you want to DIY the repair.
There are two heated seat fuses: one in the rear fuse block & one in the cabin fuse box. But if one is blown (& I suspect it will be), a replacement will likely just blow also.
If you are good with a multimeter, PM me with an email address & I'll send the diagnostic chart from the GM Service Info.
edit: I talked to a friend who has more experience with heated seats & he said the problem is often with the driver's butt element as it gets the most flexing of the four.
Last edited by greenman; 12-19-2011 at 09:42 PM.