If you have played with it and so far not finding what it controls how about the speakers in the ceiling, up meaning the bedroom, down the living area? Turn the radio system on and give it a try. Maybe you have done that already, so I really don't know, just guessing.
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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