Control device of an engine starter of a vehicle

The control has an electronic control unit (10) to control a closing of a contactor (21) with a control key and to open the contactor after starting a heat engine. The control unit is connected to an engine control computer (7) and has an inverter relay (12) that cuts off a supply of the contactor after a start phase of the heat engine and switches non current carrying pulse width modulation (PWM) signal towards equipment.