A device for actuating a lock mounted in a door includes a handle with a bearing extension at one end, which can be installed from the exterior of the door in a bracket mounted in the interior of the door. A two-part electrical control unit has one control unit located in the handle and a second control unit in the vehicle. Electrical wiring with two sections, which are connected to each other by an electrical coupling part and a mating coupling part, extends between the two parts of the control unit. A receptacle for the electrical coupling part is provided in the bearing extension of the handle. The mating coupling part at the end of one section of wiring projects out through the opening in the exterior panel of the door and is fitted into the coupling part of the handle before the handle is installed. When the handle is to be installed, a common structural unit is available, composed of the handle, the coupling part, and the mating coupling part. When the handle is actuated as intended after installation, its pivot axis serves simultaneously as the axis of rotation for the coupling part and the mating coupling part, which are connected to each other.