I found it! I think. I took off the plastic liner that is on the wheel well to the front of the wheel, that spans from the fender to the rail. Behind this liner was a box that was mounted to the wall, but it's not quite that big (about 2 x 3) and doesn't seem to have aluminum heat fins.
The connector's a large oblong thing (about 1-1/2" long) with the wires all in a single row, and the connector was on the flat side, facing me.
Is this it? Does MercedesShop carry this? Is the service CD available to me for my car?
[Edited by PhilKwon on 01-13-2001 at 12:54 AM]