I have 07 107k and the lumbars just seem not to work on either seat. Is this a common thing that they just stop working? When the button is pressed I don’t hear anything.

 

Mine don't work either. Driver side are impossible to find. You can still get passenger side units new but they are almost $200. It is a cable actuator system. Rigging up a linear actuator replacement is on my list (but pretty far down).