On my SE off Road I have leather but no heated seats. I noticed on the console in front of the shifter you can faintly see the cut outs (if you look just right) for the switches. It got me thinking, does anyone know if the leather seats are pre-wired? If they are you would just have to add the switches.
Probably not, but you can purchase aftermarket seat heaters pretty cheap and install them yourself. Then buy some stock switches or install the aftermarket ones in the stock locations.