Just take the switch out and clean the connections(terminal and screw). That should solve the problem. This has happened to my SVT and mystique. A little bit of corrosion stops it from working.
Green 2000 SVT #1166
mods-K&N and Custom heat shield, optimized y pipe, Magnaflow center resonator, DMDhttp://www.geocities.com/savinoss/Cars.html
-Wifes car 99 Mystique V6 5 spd