Dodge 2016 Dart Owner's Manual page 43

THINGS TO KNOW BEFORE STARTING YOUR VEHICLE 41
To Lock The Vehicle's Doors
With one of the vehicle's Passive Entry RKE transmitters
2
within 5 ft (1.5 m) of the driver or passenger front door
handles, push the door handle LOCK button to lock all
four doors.
Do NOT grab the door handle, when pushing the door
handle button. This could unlock the door(s).
Push The Door Handle Button To Lock