GMC 2007 Acadia Owner's Manual page 308

BAND: Press this button to listen to the radio
when a CD or a DVD is playing. The CD or DVD
remains inside the radio for future listening or
viewing entertainment.
DVD/CD AUX (Auxiliary): Press this button
to cycle through DVD, CD, or Auxiliary when
listening to the radio. The DVD/CD text label
and a message showing track or chapter
number displays when a disc is in either slot.
Press this button again and the system
automatically searches for an auxiliary input
device, such as a portable audio player.
If a portable audio player is not connected,
"No Aux Input Device" displays. If a disc is in
both the DVD slot and the CD slot the DVD/CD
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AUX button cycles between the two sources and
not indicate "No Aux Input Device". If a front
auxiliary device is connected, the DVD/CD AUX
button cycles through all available options,
such as: DVD slot, CD slot, Front Auxiliary, and
Rear Auxiliary (if available). See "Using the
Auxiliary Input Jack(s)" later in this section, or
"Audio/Video (A/V) Jacks" under, Rear Seat
Entertainment System on page 311 for more
information.
If a MP3/WMA is inserted into top DVD slot, the
rear seat operator can turn on the video screen
and use the remote control to navigate the
CD (tracks only) through the remote control.