I've looked at past threads about ACS and could not find the answer to my problem. I have a 2002 S250 that has been operated solely by hand controls for over 10 years. I want to switch to foot pedals but when I do I cannot get the pedals to unlock. With the machine running, seat bar down, and in full operation mode I hit the switch to convert from hand to foot and I get 3 beeps and the lift and tilt light goes dark. I then hit the full operation button (green) and the lift/tilt lights back up but I have no pedal movement. When I hit the switch to convert back to hand controls I get the same thing, 3 beeps, light out, press green button, light on, then I have hand controls. I checked for error code(s) and it reads NONE. If I shut the machine down in pedal mode and start back up I still have no pedal movement. Any help is appreciated.