On my 335 there was only one dummy, looked different but was a plumbing vent cover. Opened it and found a coax and a flat, RJ-11 cable. Hooked them up...but it didn't end there.
On my coach, it turns out that the other end of both cables is left behind the back of the center storage compartment over the dash. Looks like the back is solid, but if you pry it up you will find that it is double wall and there is a rough cut in the back to access the pre-wire. The fake back panel should have been screwed, but mine was held in by the molding.
P.S. Sorry, misread your post, you wanted to know about satellite radio. My bad. Through the cutout, however, you can reach into the entire fiberglass front cap. I was going to put a satellite radio antenna in that space, but instead opted to use the internet app instead of the satellite receiver for Sirius.
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2015 335DS
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