System for securing output control signals of an information processing unit

The system has a maintenance unit (19) maintaining security of control signals delivered by a microcontroller (14). The maintenance unit (19) is interposed between the microcontroller and a supply power switching unit (15) that comprises a power output stage for each output of control signal. The unit (19) presents an inhibition entry (20) connected to an output of functionally operating state of the microcontroller.