Ford Explorer security system reset?

Soooo... the car lot we bought our 2003 Explorer from has the vehicle (supposedly trying to fix it). They say that they think the security system has everything shut down. I find that pretty odd considering it was working fine one night, then wouldn't start the next morning when nothing had happened to it. Anyway... show more Soooo... the car lot we bought our 2003 Explorer from has the vehicle (supposedly trying to fix it). They say that they think the security system has everything shut down. I find that pretty odd considering it was working fine one night, then wouldn't start the next morning when nothing had happened to it. Anyway aside from "go to the dealership" does anyone have any suggestions on how to reset or disable the alarm system so we can determine whether or not that is the problem?
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