I have one heated seat not working, naturally it is the drivers side. The little pilot light in the switch does not glow. I could not find a blown fuse. Have not had time to trouble shoot further, could be an open circuit in the heating element.I have been through lots of rain with this one, but the passenger side works ok.

2014 M3W, Black Cherry
1" scale steam locomotives
'57 MGA (my first car)