Smart Lock
WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
The smart lock feature is controlled by the REM. This feature prevents the operator from accidentally locking the vehicle with the key in the ignition lock cylinder. The REM receives the key-in ignition status from the instrument cluster, the driver and passenger door ajar status from the FEM before this feature can function. If the key is in the ignition, the driver door ajar, and an attempt is made to lock the vehicle with the driver door lock control switch, then all doors will lock and then the driver door will unlock. If the key is in the ignition, the passenger door is ajar, and an attempt is made to lock the vehicle with the passenger door lock control switch, then all doors will lock and then all doors will unlock.