Yes there are problems with our seat heaters, a crapy design in the seat grid, it is usually the bottom that goes out, there is a repair kit to repair the damaged wire, but then the heated seat module should be replaced as well, search the threads, many of us have had the same problems, mines in the shop right now for the seat switches led's blinking when its 10 degrees or colder, and will not work untill your butt warms up the butt warmers, but never had the problem of the rear defroster as of yet!!!