Nissan Xterra has a button on lower left of steering wheel to Power OnOff for cruise control but cruise control will not engage nor will the light on the dash come on. Is there a fuse or simple fix?

I found a great mechanic in the area and within 2 hrs and 70.00 dollars later he found there is a screw in switch up and behind the brake pedal with a "plunger type of mechanism" which over time the cruise control cut-off switch managed to "unscrew itself" which caused the cruise control not to engage. He has my business.