There isn't a single, easily identifiable "anti-theft switch button" on a 2000 Ford Expedition like some older cars might have had. The anti-theft system is integrated into the vehicle's electronic system and doesn't have a dedicated on/off switch. The system is activated automatically when you lock the vehicle with the key or key fob.
If you're having trouble with the anti-theft system, it's likely related to the key, the vehicle's computer system, or a problem with the alarm system itself. You'll need to consult a Ford service manual or a qualified mechanic to troubleshoot the issue.
