Apparently you do have a Radio Power switch, presumably on the dash.
I read your entire Operator's Manual to find info on the switch and it's location. But, unusually, there is zero mention of this switch. In other Operator's Manuals I've seen this switch detailed a great many times.
But there is one. Here's the comment in your Manual that makes the point:
Quote:
NOTE: When parked the Radio Power switch should be set to “HOUSE”, make sure the park brake is set prior to turning the vehicle off or the radio may not play DVDs
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I also checked your RVs wiring diagrams and find no help with that either.