If it is a W202 94-2000 C-class then what your looking at and what where talking about here is a relay: square, grey, opaque plastic, approx 1" x 1" x 1.25" and is a seven plug connector. Mine had white script on it that read - C459703.

If you by a new one at the dealer just compare it with what is under the gray plastic shield that you removed off the floor at the back of the trunk.