Windshield wiper system with a self-locking device that is active when the wiper drive is in a non-operating state

In order to ensure, when the drive is in a non-operating state, a self-locking that counters a change in position of the wiper, an electronically implemented self-locking is provided. To this end, the controller (S) of the wiper system monitors the wiper during the non-operating state of the drive by evaluating the position sensor signals for a change in position and, in response to the position monitoring, activates the drive in order to return the wiper into a set position (U, P).