Courtesy Lamps: Notes
WARNING: This page is about a different car, the 2013 Ford Fiesta. However, it is still accessible from the selected car via links, so may be relevant.
The courtesy lamp subsystem consists of the interior/map lamps, the door ajar switches and the BCM. The turns the courtesy lamps on when a door is opened or when an unlock signal is received from the Remote Keyless Entry (RKE) transmitter.