BMW LKM Headlight relay Up for sale is a Good working BMW LKM or "Lamp control module" Part number -- 61.35-1391 348 133188 . Fully functional unit. This unit basically controls every light in the car. If you are having lighting issues, this is generally the problem. This fits some 5 Series (89-95, E34) and 7 Series (88-94, E32) BMW's. Including 528i 535i 535is 540is 730i 735is 740i 740is 750is 750 Thanks for looking! Check the part number off your original. These located in the box on the left hand side of your engine bay.