A method and a system for producing a luminescent 3D radar-module cover for a radiator grille of a motor vehicle. A three-dimensional structure including an optical conductor is produced from a light-dispersing first plastic material in separate method steps using a first injection mold. The three-dimensional structure is metallized and metal-coated. A subsequent separation of the gating takes place. A cover element is produced from a second plastic material using a second injection mold, which at least partially covers the metallized three-dimensional structure in a planar manner in a position of use. A contour of the three-dimensional structure is left free. The gating is subsequently severed. 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 mold while molding a mount for a radar module and fastening points on the molded component.