So, I can press the cruise on/off button and the cruise light pops up. But, when I press set, nothing happenes. I don't know if the button itself isn't working or what it could be. If anyone would be able to help, that'd be greatly appreciated.

 

auto or manual transmission?

check the rubber pieces by the brake pedal that push against the 2 brake switches.

the switch for the clutch can also effect it on a manual but the engine wouldn't start if the rubber grommet on the clutch switch came off..