2008 GMC SIERRA ECO mode

The radio can begin playing while it is scanning the disc
in the background. When the scan is nished, the CD-R
or CD-RW begins playing again.
Once the disc has scanned, the player defaults to playing
MP3 les in order by artist. The current artist playing is
shown on the second line of the display between the
arrows. Once all songs by that artist are played, the
player moves to the next artist in alphabetical order on
the CD-R or CD-RW and begins playing MP3 les by that
artist. If you want to listen to MP3 les by another artist,
press the pushbutton located below either arrow button.
You will go to the next or previous artist in alphabetical
order. Continue pressing either button until the desired
artist is displayed.
To change from playback by artist to playback by album,
press the pushbutton located below the Sort By label.
From the sort screen, push one of the buttons below the
album button. Press the pushbutton below the back label
to return to the main music navigator screen. Now the
album name is displayed on the second line between the
arrows and songs from the current album begins to play.
Once all songs from that album are played, the player
moves to the next album in alphabetical order on the
CD-R or CD-RW and begins playing MP3 les from that
album.
To exit music navigator mode, press the pushbutton
below the Back label to return to normal MP3 playback.BAND:Press this button to listen to the radio when a
CD is playing. The CD remains safely inside the radio for
future listening.
CD/AUX (CD/Auxiliary):Press this button to play a CD
when listening to the radio. The CD icon and a
message showing 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.
Using an MP3 (Radio with CD and
DVD Player)
MP3/WMA CD-R or CD-RW Disc
Compressed Audio or Mixed Mode Discs
The radio also plays discs that contain both
uncompressed CD audio (.CDA les) and MP3/WMA les
depending on which slot the disc is loaded into. By default
the radio reads only the uncompressed audio (.CDA) and
ignores the MP3/WMA les on the DVD deck. On the CD
deck, press the CAT (category) button to toggle between
compressed and uncompressed audio format, the default
being the uncompressed format (.CDA).
3-106

Empty Directory or Folder
If a root directory or a folder exists somewhere in the
le structure that contains only folders/subfolders and no
compressed les directly beneath them, the player
advances to the next folder in the le structure
that contains compressed audio les. The empty folder
does not display.
No Folder
When the CD contains only compressed les, the les
are located under the root folder. The next and previous
folder function does not function on a CD that was
recorded without folders or playlists. When displaying
the name of the folder the radio displays ROOT.
When the CD contains only playlists and compressed
audio les, but no folders, all les are located under the
root folder. The folder down and the folder up buttons
search playlists (Px) rst and then goes to the root
folder. When the radio displays the name of the folder
the radio displays ROOT.
Order of Play
Tracks recorded to the CD-R or CD-RW are played in
the following order:
Play begins from the rst track in the rst playlist
and continues sequentially through all tracks in
each playlist. When the last track of the last playlist
has played, play continues from the rst track of
the rst playlist.
Play begins from the rst track in the rst folder and
continues sequentially through all tracks in each
folder. When the last track of the last folder
has played, play continues from the rst track of the
rst folder.
When play enters a new folder, the display does not
automatically show the new folder name unless
you have chosen the folder mode as the default display.
The new track name displays.
File System and Naming
The song name that is displayed is the song name that
is contained in the ID3 tag. If the song name is not
present in the ID3 tag, then the radio displays the le
name without the extension (such as .mp3) as the
track name.
Track names longer than 32 characters or four pages
are shortened. Parts of words on the last page of
text and the extension of the lename displays.
3-108

To change from playback by artist to playback by
album, press the pushbutton located below the Sort By
label. From the sort screen, push one of the buttons
below the album button. Press the pushbutton below the
back label to return to the main music navigator
screen. Now the album name displays on the second
line between the arrows and songs from the current
album begin to play. Once all songs from that album are
played, the player moves to the next album in
alphabetical order on the CD-R or CD-RW and begins
playing MP3/WMA les from that album.
To exit music navigator mode, press the pushbutton
below the Back label to return to normal MP3/WMA
playback.
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 AUX button cycles between the two
sources and not indicate “No Aux Input Device”. If afront 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 3-113
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.
XM Radio Messages
XL (Explicit Language Channels):These channels, or
any others, can be blocked at a customer’s request,
by calling 1-800-852-XMXM (9696).
XM Updating:The encryption code in the receiver is
being updated, and no action is required. This process
should take no longer than 30 seconds.
No XM Signal:The system is functioning correctly, but
the vehicle is in a location that is blocking the XM™
signal. When you move into an open area, the signal
should return.
Loading XM:The audio system is acquiring and
processing audio and text data. No action is needed.
This message should disappear shortly.
3-111

Remote Control Buttons
O(Power):Press this button to turn the video screen
on and off.
P(Illumination):Press this button to turn the remote
control backlight on. The backlight automatically
times out after seven to ten seconds if no other button
is pressed while the backlight is on.
v(Title):Press this button to return the DVD to the
main menu of the DVD. This function could vary for
each disc.
y(Main Menu):Press this button to access the DVD
menu. The DVD menu is different on every DVD.
Use the navigation arrows to move the cursor around
the DVD menu. After making a selection press the enter
button. This button only operates when using a DVD.
n,q,p,o(Menu Navigation Arrows):Use
the arrow buttons to navigate through a menu.
r(Enter):Press this button to select the choice that
is highlighted in any menu.
z(Display Menu):Press this button to adjust the
brightness, screen display mode (normal, full, or zoom),
and display the language menu.
q(Return):Press this button to exit the current
active menu and return to the previous menu. This
button operates only when the display menu or a DVD
menu is active.
c(Stop):Press this button to stop playing, fast
reversing, or fast forwarding a DVD. Press this button
twice to return to the beginning of the DVD.
s(Play/Pause):Press this button to start playing a
DVD. Press this button while a DVD is playing to
pause it. Press it again to continue playing the DVD.
3-118

While the DVD is playing, the DVD can be played
slowly by pressing the play/pause button then pressing
the fast forward button. The DVD continues playing
in a slow play mode. Also, reverse can be played slowly
by pressing the play/pause button and then pressing
the fast reverse button. To cancel slow play mode, press
the play/pause button.
t(Previous Track/Chapter):Press this button to
return to the start of the current track or chapter. Press
this button again to go to the previous track or
chapter. This button might not work when the DVD is
playing the copyright information or the previews.
u(Next Track/Chapter):Press this button to go to
the beginning of the next chapter or track. This
button might not work while the DVD is playing the
copyright information or the previews.
r(Fast Reverse):Press this button to quickly
reverse the DVD or CD. To stop fast reversing a DVD
video, press the play/pause button. To stop fast
reversing a DVD audio or CD, release the fast reverse
button. This button might not work when the DVD is
playing the copyright information or the previews.
[(Fast Forward):Press this button to fast forward
the DVD or CD. To stop fast forwarding a DVD
video, press the play/pause button. To stop fast
forwarding a DVD audio or CD, release the fast forwardbutton. This button might not work while the DVD is
playing the copyright information or the previews.
e(Audio):Press this button to change audio
tracks on DVDs that have this feature when the DVD is
playing. The format and content of this function vary
for each disc.
{(Subtitles):Press this button to turn ON/OFF
subtitles and to move through subtitle options when a
DVD is playing. The format and content of this function
vary for each disc.
AUX (Auxiliary):Press this button to switch the system
between the DVD player and an auxiliary source.
d(Camera):Press this button to change camera
angles on DVDs that have this feature while a DVD is
playing. The format and content of this function vary for
each disc.
1 through 0 (Numeric Keypad):The numeric keypad
provides the capability of direct chapter or track
number selection.
\(Clear):Press this button within three seconds after
entering a numeric selection, to clear all numerical inputs.
}10 (Double Digit Entries):Press this button to
select chapter or track numbers greater than nine. Press
this button before entering the number.
3-119

Battery Replacement
To change the remote control batteries, do the following:
1. Slide the rear cover back on the remote control.
2. Replace the two batteries in the compartment. Make
sure they are installed correctly using the diagram
on the inside of the remote control.
3. Replace the battery cover.
If the remote control is to be stored for a long period of
time, remove the batteries and keep them in a cool,
dry place.
Problem Recommended Action
No power. The ignition might not be
turned ON/RUN or in
ACC/ACCESSORY.
The picture does not ll
the screen. There are
black borders on the
top and bottom or on
both sides or it looks
stretched out.Check the display mode
settings in the setup menu
by pressing the display
menu button on the
remote control.
In auxiliary mode, the
picture moves or scrolls.Check the auxiliary input
connections at both
devices.
Problem Recommended Action
The remote control does
not work.Check to make sure there
is no obstruction between
the remote control and the
transmitter window.
Check the batteries to
make sure they are not
dead or installed
incorrectly.
After stopping the player,
I push Play but sometimes
the DVD starts where I left
off and sometimes at the
beginning.If the stop button was
pressed one time, the
DVD player resumes
playing where the DVD
was stopped. If the stop
button was pressed two
times the DVD player
begins to play from the
beginning of the DVD.
The auxiliary source is
running but there is no
picture or sound.Check that the RSE video
screen is in the auxiliary
source mode.
Check the auxiliary input
connections at both
devices.
3-120

Audio Steering Wheel Controls
Vehicles with audio
steering wheel controls
could differ depending on
your vehicle’s options.
Some audio controls can
be adjusted at the steering
wheel. They include the
following:
xw(Next/Previous):Press the down or up arrow to
go to the next or to the previous radio station stored
as a favorite.
When a CD/DVD is playing, press the down or up arrow
to go to the next or to the previous track or chapter.
g(Mute/Voice Recognition):Press and release this
button to silence the vehicle speakers only. The
audio of the wireless and wired headphones, if your
vehicle has these features, does not mute. Press and
release this button again, to turn the sound on.If your vehicle has the navigation system, press and
hold this button for longer than one second to initiate
voice recognition. See “Voice Recognition” in the
Navigation System manual for more information.
If your vehicle has OnStar
®, press and hold this button
for longer than one second to interact with the
OnStar
®system. If your vehicle also has the navigation
system, press and hold this button for longer than
one second to initiate voice recognition and say “OnStar”
to enter OnStar
®mode. See theOnStar®System on
page 2-65in this manual for more information.
SRCE (Source):Press this button to switch between
the radio (AM, FM), XM™ (if equipped), CD, and if your
vehicle has these features, DVD, front auxiliary, and
rear auxiliary.
+
e−e(Volume):Press the plus or minus volume
button to increase or to decrease the radio volume.
¨(Seek):Press the seek arrow to go to the next radio
station while in AM, FM, or XM™ (if equipped). Press
the seek arrow to go to the next track or chapter
while sourced to the CD or DVD slot.
Press the seek arrow to go to the next disc while
sourced to a six-disc CD player, if multiple discs
are loaded.
3-124

Heavy-DutyTrailer Wiring Harness
Package
For vehicles equipped with heavy duty trailering, the
harness is connected to a bracket on the hitch platform.
The seven-wire harness contains the following trailer
circuits:
Yellow: Left Stop/Turn Signal
Dark Green: Right Stop/Turn Signal
Brown: Taillamps
White: Ground
Light Green: Back-up Lamps
Red: Battery Feed*
Dark Blue: Trailer Brake**The fuses for these two circuits are installed in the
underhood electrical center, but the wires are not
connected. They should be connected by your dealer or
a qualied service center. The fuse and wire for the
ITBC is factory installed and connected if the vehicle is
equipped with an ITBC. The fuse for the battery
feed is not required if your vehicle has an auxiliary
battery. If your vehicle does not have an auxiliary
battery, have your dealer or authorized service center
install the required fuse.
If you are charging a remote (non-vehicle) battery, press
the tow/haul mode button located at the end of the
shift lever. This will boost the vehicle system voltage and
properly charge the battery. If the trailer is too light for
tow/haul mode, you can turn on the headlamps as
a second way to boost the vehicle system and charge
the battery.
4-91