I assume that you want to play the DVD through the speaker system. As Per Owners manual:
Radios with CD and DVD Audio Output Only one audio source can be heard through the speakers at onetime. An audio source is deﬁned as DVD slot, CD slot, XM, FM/AM,Front Auxiliary Jack, or RearAuxiliary Jack. Press O to turn the radio on.The radio can be heard through all of the vehicle speakers.Front seat passengers can listen to the radio (AM, FM, or XM) by pressing BAND or DVD/CD AUX to select the CD slot, DVD slot, front or rear auxiliary input (if available).If a playback device is plugged into the radio's front auxiliary input jack or the rear auxiliary jack, the front seat passengers are able to listen to playback from this source through the vehicle speakers.
See "Using the Auxiliary Input Jack(s)" later in this section, or"Audio/Video (A/V) Jacks" under,Rear Seat Entertainment (RSE)System on page 3-114 for more information.In some vehicles, depending on audio options, the rear speakers can be muted when the RSA power is turned on. See Rear Seat Audio(RSA) on page 3-123 for more information.
I know on my 2015 the volume is low so I need to turn it way up, I blow my eardrums when I switch back to radio and forget to turn it back down before selecting it off DVD.
Last edited by electbc; 04-14-2019 at 07:51 PM.