Method and device for triggering, using an rfid reader, a procedure for actuating a means for locking/unlocking the access doors of a motor vehicle

A device for triggering a procedure for actuating a means for locking/unlocking access doors (2) of a motor vehicle (1), comprising an RFID reader (5) endowed with a transmitting antenna (6), characterized in that it includes:

• a coil (7) positioned in the vicinity and in the field of action of the transmitting antenna (6) of the RFID reader (5),
• and a central unit (9) connected, on the one hand, to the coil (7) so as to receive a signal representative of the electrical voltage between the terminals of said coil, and on the other hand, to the RFID reader (5), and programmed, on the one hand, for controlling the successive transmission, by said RFID reader, of electromagnetic pulses of the same power, and on the other hand, for measuring, upon each pulse, a value representative of the electrical voltage between the terminals of the coil (7), and for triggering the procedure for actuating the locking/unlocking means in the event of a variation in the measured values greater than a determined value.