it seems that the conclusion had been made already. i know mostly about aftermarket seat heaters, however i used to have to replace them in vw's and chevy/cadillac for the dealers on a somewhat regular basis.
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**** my driver side does this is (2010) is it a do it yourself fix?
If you remove the seat from the truck you can take the seat bottom off and have a go at it. You just need to remove the leather cover and you can access the heating pad. The only complication you might run in to is the heating pad is glued to the foam seat cushion. It might be tough to remove the pad without destroying the seat foam in the process. Other than that it's just nuts and bolts. The first go around my dealer had to replace the seat foam core because they destroyed it removing the pad. If you purchase both the seat core and the heating pad it should be a pretty straight forward repair.
I need to do this as well. Anybody remember the cost outside of warranty?
Thanks Bird