TODAY (and since sometime last summer) all of the Schwintek modules are located in the same place - in the pass thru storage area just above the OFF DOOR SIDE baggage door on the underside of the bath floor. Poke your head in the pass thru and look up to the bath deck floor and it might be there.
If your unit was built prior to this change, it could have been in a variety of places. I'd refer you to Roger at firstname.lastname@example.org
at that point for individual assistance.
Hope this helps some of you.