Passive Anti-Theft System
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2004 Ford RV Cutaway, 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, and 2004 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
Excursion vehicles are equipped with a passive anti-theft system (PATS) which prevents engine operation without the correctly encoded ignition key. For additional information on the operation of this system, refer to ANTI-THEFT - PATS article.