Door Ajar Switch
WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The door ajar switches each receive a 12-volt signal from the BCM on independent circuits. When the door is closed, the door ajar switch is closed, routing the signal to ground. When the door is opened, the door ajar switch opens, interrupting the signal. The BCM interprets this as an open door.
The door ajar switches are part of the door latches and not serviceable separately.