A system (1) for detecting a readiness of a closure element (10) of a motor vehicle to lock has a first sensor (12) for detecting a position signal of the closure element (10) and a second magnetic sensor (14) for detecting a magnetic field signal (18). The first sensors (12, 14) are connected by a data link to an electronic unit (20), and the magnetic field signal (18) and the position signal are passed by a data link to the electronic unit (20). The electronic unit (20) has a memory (22) with at least one stored magnetic field signal value (24). The electronic unit (20) generates a change in the output signal when there is a positive comparison of the magnetic field signal value (24) with the detected magnetic field signal (18), and when an end position of the closure element (10) is detected.