Principles of Operation: Notes
WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The smart junction box (SJB) is also known as the generic electronic module (GEM).
The SJB supplies voltage to the interior lighting system. The interior lighting system illuminates the courtesy lamps while a vehicle door is ajar, and the vehicle speed is less than 5 km/h (3 mph). The SJB controls all interior lighting functions and timing by monitoring inputs from the door ajar switches, the dimmer switch, and the vehicle speed.