I have the heated seats, and as far as I know, it only heats the seat bottoms, and not the lumbar support. Not a huge deal, but my 2005 Mini was able to heat both the bottom, and the lumbar. I wonder though if it has something to do with the adjustable lumbar support as to why it doesn't have it.
2014 Cherokee Trailhawk V6: Deep Cherry Red w/ hood decal
Cold Weather Package | Tow Group | Convenience Package | Leather-trimmed Bucket Seats | Panoramic Sunroof | CD Player | 8.4Nav | 9-Speaker Sound | Tonneau Cover | Off-Road Accessory Kit