GMC 2009 Sierra - Manual (Page 226)

Radios with CD and DVD Audio Output
Only one audio source can be heard through the
speakers at one time. An audio source is defined as
DVD slot, CD slot, XM™, FM/AM, Front Auxiliary Jack,
or Rear Auxiliary Jack.
Press the O button 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 the BAND button or
the DVD/CD AUX button to select 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 3-109 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 3-118
for more information.
Playing an MP3 CD-R or CD-RW Disc
Radios with a Six-Disc CD player have the capability of
playing an MP3 CD-R or CD-RW disc. For more
information on how to play an MP3 CD-R or CD-RW
disc, see “Using an MP3” in the index.
Playing an MP3/WMA CD-R or
CD-RW Disc
Radios with a CD and DVD player have the capability of
playing an MP3/WMA CD-R or CD-RW disc. For
more information on how to play an MP3/WMA CD-R or
CD-RW disc, see “Using an MP3” in the index.
CD Messages
CHECK DISC: Radios with a Single CD player or
radios with a Six-Disc player displays CHECK DISC
and/or ejects the CD if an error occurs.
Radios with a CD and DVD player may display other
messages when an error occurs:
Optical Error: The disc was inserted upside down.
Disk Read Error: A disc was inserted with an invalid or
unknown format.
3-90