Problem Seat heating


I have a problem with the heating of the right seat: it no longer works or only works on the front part of the seat.

Until a few days ago, it was working so well that it was frying the rear of the person sitting on the chair.

Do you have any idea what could be the cause and how I could fix it?

The driver's seat works perfectly (heating).

I guess there is only one safety for both seats, right?