Demand Lamps
WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
The demand lamps subsystem consists of the map/reading lamps, the vanity mirror lamps located in the visors and the engine compartment lamp. The BCM energizes the battery saver relay to supply voltage to the demand lamps when the battery saver feature is not active.