Where is the door jamb switch located in an F-150 pickup?

The door jamb switch on an F-150 is located in the door jamb itself, on the door side. There's one switch for each door (driver, passenger, and rear doors if equipped). You'll find it where the door meets the body of the truck, usually hidden within the rubber boot or weatherstripping. It's a small, rectangular switch and often requires some careful manipulation of the weatherstripping to see.