If you know anything about electrical on a car, this is an easy one. If you don't, it's still easy. To find out if your bcm needs the flash or not, open up the fuse panel under the hood.Locate the fog lamp fuse (can't remember which one it is but it isn't hard to find). Take any 12v light or a test light and connect one side of the light to top of the fuse (one of the two exposed metal parts on top) and then the other lead of the light to any nearest body ground source. If the light lights, you're good. If not, you will need a flash.