The lower lumbar adjustment feature of the driver's seat had stopped working when the vehicle was about 9 years of age. I can hear the motor turning in there but there must be a stripped gear (plastic?) as it makes a click, click sound. This isn't a critical problem but can lead to some sitting fatigue for some people that suffer from sitting for long periods of time. One workaround is to simply use a shirt or ready made product if you do need the lumbar support.

I didn't venture into taking the seat apart or seeing how much it would cost for repair. Best of luck to ya!