This may sound weird but do you see any speakers in the living room area? If you do find some, then its just a matter of selecting the right output on the head unit. Generally the outputs are marked A,B,and C. You should be able to select which speakers you want to hear one set at a time or sets of your choice.
Hope that helps.
[SIGPIC]TV-2012 Ford F250 XLT Supercrew 4X4
TT- 2010 Jayco Jay Flight 17Z (traded)
TT- 2012 Coachman Catalina 30BHS (current)
Me and my wife with 3 kids love camping!!