A plug-in connector (10) for a control unit (100) of a window opener in a motor vehicle, including a box-like housing (1) . The plug-in connector (10) includes a plurality of motor connections (2) , situated in corresponding longitudinal seats (4) . Each motor connection (2) includes a base (21) , partially embedded in the box-like housing (1) and a terminal, clamp portion (22) , which engages with a relative comb connector (3) of the complementary female connector. A longitudinal slot (25) is made in an intermediate portion (24) of the connection (2) . The areas (26a, 27a) joining longitudinal prongs (26, 27) and the base (21) , and the areas (26b, 27b) joining the prongs and the clamp portion (22) , deform, like hinge points of a pivot parallelogram.