GMC 2009 Sierra - Manual (Page 225)

To play the tracks from a CD loaded in the radio
with CD and DVD, press the DVD/CD AUX
button when not sourced to the CD, or insert a disc
partway into the slot. A RDM label displays.
To play tracks from a single CD in random order,
press the pushbutton positioned under the RDM
label until Random Current Disc displays. Press the
pushbutton again to turn off random play.
BAND: Press to listen to the radio when a CD is
playing. The CD remains inside the radio for future
listening.
For the radio with CD and DVD, press to listen to the
radio when a CD or DVD is playing. The CD or
DVD remains inside the radio for future listening or for
viewing entertainment.
CD/AUX (CD/Auxiliary): Press this button to play a CD
when listening to the radio. The CD icon and a
message showing the disc and/or track number displays
when a CD is in the player. 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 Input Device
Found” displays.
DVD/CD AUX (Auxiliary): Press to cycle through
DVD, CD, or Auxiliary when listening to the radio.
The DVD/CD text label and a message showing the
track or chapter number displays when a disc is in
either slot. Press 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 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 (RSE) System on page 3-109 for
more information.
If a disc 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.
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