If you look on the windscreen from the outside there SHOULD be a sensor, its a couple of inchs in size and just below where the rear view mirror is attatched to the screen. Turn you ignition on and then select auto headlights on the dashboard, go outside and place your hand over the sensor and if all is well your headlights SHOULD light up.
By the sound of it, with both the auto headlights and the auto wipers not working i would say its one of a couple things,
A) Its likely that the screen has been replaced at some point with an aftermarket screen with no sensor fitted to it, if it does not have a Ford marking in the corner it been replaced.
B) The sensor has not been connected correctly, or its given up the ghost and gone south.