An improved four-bar hinge assembly for attaching a trunk deck lid to a vehicle body in which the control link of the four-bar linkage has its usual vehicle-mounted pivot pin replaced by the rotatably driven output drive shaft of a power drive mechanism that is rigidly and directly coupled to the control link to swing to the same and thereby power actuate the four-bar linkage in order to pivot the deck lid between open and closed positions. The hinge elements are located on the weather side of the vehicle body components and the drive shaft extends through the vehicle sheet metal into the weather sealed trunk compartment so that the electro-mechanical drive components are mounted within the weather sealed trunk.