have powers seats, with heat, but the only thing that doesnt work is the lumbar and the lumbar seat is fully expanded. all other functions work on the seat. any ideas would be greatly appreciated.

 

Mine quit a while back and a bit of searching showed the wires cut in the hinge of the seatback. The system works on reversing the polarity and mine happened to cut the right one at the right place to constantly deflate mine. Good Luck