You need to remove the old conductive jell residue from the windshield mounting bracket, clean the area of the windshield that contacts the windshield moisture sensor ens with a 50/50 mixture of isopropyl alcohol and water by volume on a dampened lint-free cloth, align and secure the two sensor halves back as one unit, remove the-plastic protective-covering from the lens, position and install the moisture sensor back onto the windshield bracket, connect the electrical cover and secure the rain sensor module trim cover.