I have a question on how the heated seats are supposed to work. When I push the button for my heated seat and the light for the back part of the seat is on and the 3 lights for the temperature are on I was under the impression that both the back and bottom seats were being heated. Mine only heats the back like that and if I turn off the back light the bottom comes on. Both seats do this so am I doing something wrong? I would like to be able to use both the back and bottom heaters during the winter.