The invention relates to a method and an assembly suitable for performing the method, which are used for producing a luminescent 3D-radar module cover. The radar module cover is arranged in a region of a radiator grill of a motor vehicle. In a separate method step, a three-dimensional structure is produced from a first plastic that scatters light by means of a first injection-molding tool, the three-dimensional structure has at least one light conductor, the three-dimensional structure is metal-coated and mirrored, and then a main flow is separated; a cover element is produced from a second plastic by means of a second injection-molding tool, and then the main flow path is separated; the cover element at least partially covers the metal-coated three-dimensional structure at a use positionin a planar manner, an outline of the three-dimensional structure is notched at the cover element, and at the same time the three-dimensional structure is metallized together with the cover element disposed thereon and is embedded in a third plastic material with the aid of a third injection-molding tool while molding a mount for a radar module and fastening points on the molded component.