Wow I am surprised that the code was there. I am almost positive it wasn't on my Express. Are you saying that you truck actually had the wiring and your heated seats are working but you just don't have the buttons in the dash or you have the icons on the radio but the seats don't work? If you have the wiring maybe the 2500's are different than the 1500 because my Express has nothing at all.
I had the icons added with the code, but do not have the wiring for the seats.
The pic attached is not from my truck, put it is the same code.