A door locking system is provided for a motor vehicle. The door locking system includes, but is not limited to a mechanical door opening safety catch and a warning unit configured to generate a first warning signal that is exclusively suppressed by a manual activation of the mechanical door opening safety catch. A motor vehicle is provided that includes, but is not limited to a vehicle body, a rear vehicle door that is linked on the vehicle body and facing away from a vehicle travel direction, the rear vehicle door configured to pivot, a door opening safety catch configured to be mechanically activate upon the pivot of the rear vehicle door, and a warning unit configured to generate a first warning signal that is exclusively suppressed by the mechanical activation of the door opening safety catch.