Patent ID: 7750797

Claim:
A method of detecting separation of an electronic module ( 1 ) from a vehicle on which the module is mounted, comprising the steps of: associating with the module ( 1 ) an inductance ( 17 ; 31 ; 41 ) inseparable from said module, the inductance ( 17 ; 31 ; 41 ) and the module ( 1 ) connected to the vehicle in an immediate vicinity of an element ( 18 ; 38 ; 43 ) made of ferromagnetic material and connected to the vehicle, monitoring one of i) a magnetic parameter of the inductance, ii) a current passing through the inductance, and iii) a voltage at terminals of the inductance ( 17 ; 31 ; 41 ) so as to detect any variation of the monitored one of the magnetic parameter, the current, and the voltage, detecting a variation of the monitored one of the magnetic parameter, the current, and the voltage, determining the detected variation is greater than a predetermined variation threshold being representative of a relative distance between the inductance ( 17 ; 31 ; 41 ) and the element made of ferromagnetic material ( 18 ; 38 ; 43 ) and thereupon ordering an emission of a signal indicating separation of the module ( 1 ) from the element of the vehicle, wherein the inductance ( 17 ; 31 ; 41 ) is polarized by a current source ( 15 ; 32 ; 44 ) connected so as to power said inductance.