Smart Unlock
WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The smart unlock feature prevents the driver door from locking with the key in the ignition lock cylinder. When the VSM receives a LOCK command from a door lock control switch, and the key is in the ignition lock cylinder with the driver door open, the VSM commands the driver door to UNLOCK.