Light intensity regulator — a genuine BMW part, number 61 31 8 357 651. The number stamped on the part is 61318357651; BMW's catalog files it under the short number 8357651. You will find it on our Electrical shelf, under Switch. BMW has since replaced it with 1391841.
It fits every E36 body style (318i, 318ti, 320i, 323i, 325i and 328i, 1992–1999), with the M40, M42, M43, M44, M50 or M52 engines — and the European-market versions.
BMW draws it on 2 diagrams, among them Various switches (61_0063) and Various switches (61_4882). It weighs about 37 g (under 0.1 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.
