Driver side seat heater does not work. Passenger side still working. Both are on the same fuse. 15,000 miles.
How’s your coolant level? Are you still under warranty?
Check and see if you are still in the 3 year - 36000 miles bumper to bumper warranty. Other wise you will have to pay the dealer to replace the seat heater as they are not repair items.
Bad switch, broken wire, bad relay… Pick one.