More than likely, it is not plugged in. The wiring harness is quite short and you almost have to plug the connecter in to the switch connector after the dash panel is in place. Make sure you hear the 'click' when you plug it in.
'06 Mustang Pony Convertible
'00 F150 Super Cab 4X4
'05 Escape Limited
-- Wasn't planned, but I'm not complaining.