When I had my driver's seat apart, which is heated and cooled, there was only the TED that either blows hot or cooled air depending on the current into the TED. There is no room for a heating pad if you have the perforated cooled and heated leather. It physically wouldn't fit.
View attachment 263706
When my heating feature was not working right, I found the wiring under the passenger seat burnt up. All I know is that now that mine is fixed, it feels like hair blow dryer is under my ass and back. The fan does run, but not as loud as when the cooled function is on. The ordering of parts is really confusing.