My 1998 f150 that i bought has the automatic door locks, so when you start it up and put your foot on the brake and put it into drive or rev. the doors will lock. Well someone deactivated the system, and in my owners manual it tells how to deactivate the system, but doesn't say how to activate it again. Does anybody know how to do this?

 

In the '99 manual, the procedure is a toggle. In other words, you do the same thing to deactivate and activate the feature.