FFX 737-800; no yaw damper? How to get one in?

ok so I learned from Nexus the yaw-damper in my 737-800 must be switched on to get rid of the Flight Controls warning.
But....it seems this FFX model is not equipped with a yaw damper. The switch is on the panel but it does not activate the Y/D. The keyboard "ctr+d" won't do the trick either. Switching to the default 737-400 panel gives the same result. No working Y/D
My question: how can I get a working Y/D in a plane? I hope it is something that can be easely fixed in the aircraft.cfg
Thanks
AJ
But....it seems this FFX model is not equipped with a yaw damper. The switch is on the panel but it does not activate the Y/D. The keyboard "ctr+d" won't do the trick either. Switching to the default 737-400 panel gives the same result. No working Y/D

My question: how can I get a working Y/D in a plane? I hope it is something that can be easely fixed in the aircraft.cfg
Thanks
AJ