Courtesy Lamps
WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The courtesy lamp subsystem consists of the ajar switches, the interior dome lamps, the instrument panel dimmer switch and the SJB . The SJB supplies voltage to the courtesy lamps when the SJB receives the required input.