Unfortunately your seat heater element has failed, that is usually accompanied by a slight burning smell. To replace it:
The dealer will try to sell you a new seat, or replace it under warranty, or go and do it on your own by simply tearing up the seat and replacing the core. Mine failed 1 year ago and I think Jon's (Bora2021) did recently as well.
Good Luck.
Also:
[ December 13, 2003: Message edited by: TF242 ]