Abstract: The invention relates to a method of detecting the blocking of a three-phase stepper motor featuring three coils, characterised in that, with the stepper motor having its coils connected in star mode, with a common terminal (P), it implements a detection of a said blocking of the rotor of the motor, by supplying two of the said coils (A, B) with electricity in such a way that they are traversed by a current, and by measuring the voltage at an end terminal of the third coil (C). A comparison of the measured voltage is carried out with at least one given threshold.