Originally Posted by KapitalZ

"No it isn't, not functioning."

phunk provides possible cause and solution here: S mode not working at all

"Your posts are describing a top clutch switch that needs adjustment. When your top clutch switch is out of adjustment, the control systems are unable to determine when you have your foot on the clutch or not.

Your current switch adjustment is not allowing the switch to fully close when your foot is off the pedal. This means the control system believes your foot is constantly on the clutch pedal as you are driving...

If you go under your dash and adjust the top clutch switch so that it fully closes when you let go of the pedal, your S-Mode will return to normal and your cruise control will start working again. It is a very simple adjustment. Loosen the lock nut, thread the switch closer to the pedal, then tighten the lock nut, done."