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Hi my name is ***** ***** I will be happy to assist with this today.I apologize as my info is limited on this model here.
With what you have described here this sounds like an internal fault with the switch that switches from inside to outside speakers.I have seen some of these fail before with it needing removed and repaired by a repair facility.Being a new model the interior speaker connection may be disconnected from the radio and may only need connected.Being a 2016 model this should be covered under warranty at a dealer for repair.
Let me know if you need anything else and feel free to rate my help here.