Belt tensioning system for a motor vehicle and security system with such a belt tensioning system

Belt tensioning system for a motor vehicle with at least two separate Gurtstraffungseinrichtungen (4, 6, 8, 10) for the reversible tightening of separate safety belts, wherein the Gurtstraffungseinrichtungen (4, 6, 8, 10) each have a drive unit (12, 14, 16, 18), wherein a common control means (44) for the at least two Gurtstraffungseinrichtungen (4, 6, 8, 10) is provided, characterized in that the common control device (44) in a Hauptgurtstraffungseinrichtung (4) is integrated, wherein the Hauptgurtstraffungseinrichtung (4) the Gurtstraffungseinrichtungen (4, 6, 8, 10).