Seat Heating

Hello, I have a 2005 model 2.0 HDi 407 vehicle. The seat heaters on both sides of my car are not working. The electrician checked the fuses and said there was no problem. Anyone know what else it could be?

Have a general look I think
Have the buttons checked. (Is there voltage coming to the buttons? have them checked or you can do it with a measuring instrument if you can.)
If it does, have the button that activates the heater checked.

I think it will work if there is no damage to the heater resistances in the seat.
br>It is not a definitive solution, but I believe that it will reach the result more quickly.