Yes, method depends on set up, model year, what cables run where. Channel 3 (scan for channels) is one option. I would suggest wiring directly to make things simpler.
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On my 2012, you set the TV to AV2 input to get DVD picture on TV. Sound is from surround sound speakers. This is with only one TV installed from factory, so no "switch box" to select multiple sources for multiple TVs.
2012 Forest River Sunseeker 2300 Chevy
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2012 Forest River Sunseeker 2300 Chevy