Airbag fixed to steering wheel

The system has a steering control device (4) mounted on a steering support (6) and soliciting a sensor (9) to provide electric information to a vehicle unit which is in mechanical disjunction with the support and device. An air-bag (5) is mounted on the device and fixed on the support. A reversing unit (7) applies load on the device, a commutation block (8), and the sensor. The block is stacked on a piece integrated on the device.