Control method for activating a control device designed to be incorporated into a starter for a combustion engine, the device comprising a solenoid controlling the position of a pinion of the starter suitable for being engaged in a ring gear kinematically associated with a crankshaft of said engine, said pinion being able to be driven by an electric motor of the starter by closing a first switched power supply channel between a battery and the starter, the device also comprising an auxiliary relay and at least one power resistor placed in series creating a second switched power supply channel in parallel with said first switched channel and making it possible to power, via a power supply current that is weaker than the maximum current, the electric motor of the starter driving said pinion, characterized in that the method, after automatically switching off the engine when the vehicle speed is zero, comprises the steps of - switching said auxiliary relay situated along said second switched power supply channel in order to accelerate the pinion of the starter by providing a lesser current than the maximum current to the electric motor of the starter driving said pinion, - determining in a predictive manner the rotation speed of the ring gear kinematically linked with the crankshaft of said engine, - determining in a predictive manner the duration of the acceleration phase of the pinion in order to obtain a rotation speed of said pinion corresponding to the rotation speed of said ring, - once the rotation speeds of said pinion and of said ring have been synchronized, carrying out the engagement of said pinion of the starter in said ring of the engine by powering the solenoid, - switching said first switched power supply channel in order to supply the maximum current to the electric motor of the starter driving said pinion in order to start the engine, - once the combustion engine is running independently via the combustions, carrying out the disengagement of said pinion of the starter from said ring of the engine and disconnecting all power to the electric motor of the starter. these steps being carried out only when the engine is subsequently restarted automatically when the user activates it again, in a functionality commonly called "Stop & Start". - switching said auxiliary relay situated along said second switched power supply channel in order to accelerate the pinion of the starter by providing a lesser current than the maximum current to the electric motor of the starter driving said pinion, - determining in a predictive manner the rotation speed of the ring gear kinematically linked with the crankshaft of said engine, - determining in a predictive manner the duration of the acceleration phase of the pinion in order to obtain a rotation speed of said pinion corresponding to the rotation speed of said ring, - once the rotation speeds of said pinion and of said ring have been synchronized, carrying out the engagement of said pinion of the starter in said ring of the engine by powering the solenoid, - switching said first switched power supply channel in order to supply the maximum current to the electric motor of the starter driving said pinion in order to start the engine, - once the combustion engine is running independently via the combustions, carrying out the disengagement of said pinion of the starter from said ring of the engine and disconnecting all power to the electric motor of the starter.