According to the invention, the actuating device is characterized in that the actuating device comprises an additional parking lock actuating element (4) for activating the parking lock.

In accordance with the mode of failure determined by auxiliary lock determination, the wheel subjected to auxiliary lock control and the parking brake force produced by auxiliary lock control are set.

The stall controller generates additional stall signals in order to stall other stages in the pipeline.

The re-engagement of the parking lock can thus only occur by actuating the additional parking lock actuating element (4), but not by actuating the gear selecting element (1).

A switching control IC (81) conducts an on-off control of a first switching element (Q1).

Several locking and controlling members (21) are provided, at least one of which is allocated to each of said rotational positions.

According to the invention, at least one wheel brake (5) is designed with a locking device (21) and, for a locking actuation, the brake booster (15) is actuated and the wheel brake (5) is locked in the actuated state.

Optionally, the monitoring device kills the receipt of the media object by the remote device in response to a kill command (679, 689).