Abstract: A telecontrol system for the remote execution of functions comprising actuation of devices in a motor vehicle, for example operation of courtesy lights and locking and unlocking of the doors, comprises a receiver module mounted on the vehicle and an emitter unit carried by the user for transmitting coded radio signals to the receiver module. A data signal configuring circuit of the receiver module has a detection threshold level which is regulated according to predetermined zones of functional ranges between the emitter and the receiver module, around the vehicle, in such a way that a function on the vehicle which is controlled by the emitter is only validated if the emitter is in the appropriate zone of functional range.

Abstract: A remote control system for locking and unlocking a passenger space in a motor vehicle has an on-board unit that includes an emitter of signals S.sub.E of a first type and receiver of signals S.sub.P of a second type. There also is a portable device that has a receiver of first type signals S.sub.E and an emitter of second type signals S.sub.P. The apparatus also detects that the portable device has been forgotten inside the passenger space by determining the relative position of the portable device in relation to the interior of the passenger space. The apparatus for determining the position of the portable device in relation to the interior of the passenger space is integrated into the portable device with the portable device emitter of the second type signal S.sub.pforgotten in the event of detection of the portable device having been forgotten inside the passenger space.