If you are asking about the living room, it should all come out of the TV or sound bar. If I remember correctly, I had to change the wiring around because the sound bar came only connected to the DVD/blue ray player. Or they may have had the in/out backwards, I can't remember.
The garage and outdoor TV are supposed to be connected with the ability flip switches and control the movement of sound out of the radio/dvd player and the TV. You are also supposed to be able to watch a movie outdoors from the DVD player in the garage. Mine is wired wrong and it is one of my projects to fix it. Last summer someone put on a post about trying to trace it all and it was a mess. You can pull out the radio in the garage easy enough, but it there is a rat nest of wires behind it. My bag of goodies came with the RCA cables needed to get it all connected but not all of the switches are connected to hook into the outdoor and ceiling speakers.
Unfortunately, all I can say is good luck trying to figure it out. I don't know if the dealers put this together or if they come from the factory this bad, but it is a systemic problem with the 3950s along with a host of others.
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2016 Voltage 3970
2015 GMC 3500 Denali SRW Duramax
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