I had the same issue with my 2011 Ford fusion traced it back to my seat had a slice in the leather which cut one of the coils so I had to replace the whole thingSo I realized today that my driver's side heated seat is not working. When I press the button it lights up for 2 seconds and then shuts off. The passenger side works fine. Looked under the seat to see if maybe a wire came loose and everything looks ok. dealers gonna look at the ac chirp next week guess ill just add it to the list.
Seems to me like it would be a temp sensor likely bad. Can't see it being a fuse as one side works.
Does anyone have any insight?