service GMC YUKON XL 2007 Service Manual

Finding a Station
BAND:Press this button to switch between AM,
FM, or XM™ (if equipped). The display will
show the selection.
f(Tune):Turn this knob to select radio stations.
©SEEK¨:Press the left or right SEEK
arrow to go to the next or to the previous station
and stay there.
To scan stations, press and hold either SEEK
arrow for a few seconds until you hear a beep. The
radio will go to a station, play for a few seconds,
then go on to the next station. Press either
SEEK arrow again to stop scanning.
The radio will only seek and scan stations with a
strong signal that are in the selected band.
4(Information) (XM™ Satellite Radio Service,
MP3, and RDS Features):Press the information
button to display additional text information related
to the current FM-RDS or XM™ station, or MP3
song. A choice of additional information such as:
Channel, Song, Artist, and CAT may appear.
Continue pressing the information button to
highlight the desired label, or press the pushbutton
positioned under any one of the labels and the
information about that label will be displayed.
When information is not available, No Info will
appear on the display.
Storing a Radio Station as a Favorite
Drivers are encouraged to set up their radio station
favorites while the vehicle is parked. Tune to
your favorite stations using the presets, favorites
button, and steering wheel controls, if the
vehicle has them. SeeDefensive Driving on
page 340.
297

Radio Messages
Calibration Error:The audio system has been
calibrated for your vehicle from the factory. If
Calibration Error appears on the display, it means
that the radio has not been congured properly
for your vehicle and it must be returned to
your dealer for service.
Locked:This message is displayed when the
THEFTLOCK
®system has locked up the
radio. Take the vehicle to your dealer for service.
If any error occurs repeatedly or if an error
cannot be corrected, contact your dealer.
Radio Messages for XM™ Only
SeeXM Radio Messages on page 319later in this
section for further detail.
Playing a CD (In Either the DVD
or CD Slot)
Insert a CD partway into the slot, label side up.
The player will pull it in and the CD should begin
playing (loading a disc into the system, depending
on media type and format ranges from
5 to 20 seconds for a CD, and up to 30 seconds
for a DVD to begin playing).
If the ignition or radio is turned off, with a CD in
the player, it will stay in the player. When the
ignition or radio is turned on, the CD will
start playing where it stopped, if it was the last
selected audio source. The CD is controlled by the
buttons on the radio faceplate or by the RSA
unit. SeeRear Seat Audio (RSA) on page 332for
more information. The DVD/CD decks, (upper
slot is the DVD deck and the lower slot is the CD
deck) of the radio are compatible with most
audio CDs, CD-R, CD-RW, and MP3s.
When a CD is inserted, the text label DVD or CD
symbol will appear on the left side of the radio
display. As each new track starts to play, the track
number will appear on the display.
301

XM Radio Messages
Radio Display Message Condition Action Required
XL (Explicit Language
Channels)XL on the radio display,
after the channel name,
indicates content with
explicit language.These channels, or any others, can be blocked at a
customer’s request, by calling 1-800-852-XMXM (9696).
XM Updating Updating encryption code 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 Loss of 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 Acquiring channel audio
(after 4 second delay)The audio system is acquiring and processing audio and
text data. No action is needed. This message should
disappear shortly.
Channel Off Air Channel not in service This channel is not currently in service. Tune to another
channel.
Channel Unavail Channel no longer
availableThis previously assigned channel is no longer assigned.
Tune to another station. If this station was one of the
presets, choose another station for that preset button.
No Artist Info Artist Name/Feature not
availableNo artist information is available at this time on this channel.
The system is working properly.
No Title Info Song/Program Title not
availableNo song title information is available at this time on this
channel. The system is working properly.
No CAT Info Category Name not
availableNo category information is available at this time on this
channel. The system is working properly.
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Radio Display Message Condition Action Required
No Information No Text/Informational
message availableNo text or informational messages are available at this time
on this channel. The system is working properly.
CAT Not Found No channel available for
the chosen categoryThere are no channels available for the selected category.
The system is working properly.
XM Theftlocked Theft lock active The XM™ receiver in the vehicle may have previously been
in another vehicle. For security purposes, XM™ receivers
cannot be swapped between vehicles. If this message
appears after having your vehicle serviced, check with your
dealer.
XM Radio ID Radio ID label (channel 0) If tuned to channel 0, this message will alternate with the
XM™ Radio eight digit radio ID label. This label is needed
to activate the service.
Unknown Radio ID not known
(should only be if
hardware failure)If this message is received when tuned to channel 0, there
may be a receiver fault. Consult with your dealer.
Check XM Receivr Hardware failure If this message does not clear within a short period of time,
the receiver may have a fault. Consult with your dealer.
XM Not Available XM™ Not Available If this message does not clear within a short period of time,
the receiver may have a fault. Consult with your dealer.
320

AM
The range for most AM stations is greater than for
FM, especially at night. The longer range can
cause station frequencies to interfere with each
other. For better radio reception, most AM
radio stations will boost the power levels during
the day, and then reduce these levels during
the night. Static can also occur when things like
storms and power lines interfere with radio
reception. When this happens, try reducing the
treble on your radio.
FM Stereo
FM stereo will give the best sound, but FM signals
will reach only about 10 to 40 miles (16 to 65 km).
Tall buildings or hills can interfere with FM
signals, causing the sound to fade in and out.
XM™ Satellite Radio Service
XM™ Satellite Radio Service gives digital radio
reception from coast-to-coast in the 48 contiguous
United States, and in Canada (if available). Just
as with FM, tall buildings or hills can interfere with
satellite radio signals, causing the sound to
fade in and out.In addition, traveling or standing under heavy
foliage, bridges, garages, or tunnels may cause
loss of the XM™ signal for a period of time.
The radio may display NO SIGNAL to indicate
interference.
Care of Your CDs and DVDs
Handle CDs carefully. Store them in their original
cases or other protective cases and away from
direct sunlight and dust. The CD player scans the
bottom surface of the disc. If the surface of a
CD is damaged, such as cracked, broken,
or scratched, the CD will not play properly or not
at all. If the surface of a CD is soiled, take a
soft, lint free cloth or dampen a clean, soft cloth in
a mild, neutral detergent solution mixed with
water, and clean it. Make sure the wiping process
starts from the center to the edge.
Do not touch the bottom side of a CD while
handling it; this could damage the surface. Pick up
CDs by grasping the outer edges or the edge of
the hole and the outer edge.
336

If you keep pace with the traffic and allow realistic
following distances, you will eliminate a lot of
unnecessary braking. That means better braking
and longer brake life.
If your engine ever stops while you are driving,
brake normally but do not pump your brakes.
If you do, the pedal may get harder to push down.
If your engine stops, you will still have some
power brake assist. But you will use it when you
brake. Once the power assist is used up, it
may take longer to stop and the brake pedal will
be harder to push.
Adding non-GM accessories can affect your
vehicle’s performance. SeeAccessories and
Modications on page 426.Anti-Lock Brake System (ABS)
Your vehicle has the Anti-Lock Brake System
(ABS), an advanced electronic braking system that
will help prevent a braking skid.
When you start your engine and begin to drive
away, ABS will check itself. You may hear a
momentary motor or clicking noise while this test
is going on. This is normal.
If there is a problem
with ABS, this warning
light will stay on.
SeeAnti-Lock Brake
System Warning
Light on page 233.
Along with ABS, your vehicle has a Dynamic Rear
Proportioning (DRP) system. If there is a DRP
problem, both the brake and ABS warning lights will
come on accompanied by a 10-second chime. The
lights and chime will come on each time the ignition
is turned on until the problem is repaired. See your
dealer for service.
345

StabiliTrak®System
Your vehicle may be equipped with the
StabiliTrak®system which combines antilock
brake, traction and stability control systems and
helps the driver maintain directional control of the
vehicle in most driving conditions.
When you rst start your vehicle and begin to drive
away, the system performs several diagnostic
checks to ensure there are no problems. You may
hear or feel the system working. This is normal and
does not mean there is a problem with your vehicle.
The system should initialize before the vehicle
reaches 20 mph (32 km/h). In some cases, it may
take approximately two miles of driving before the
system initializes.
If the system fails to turn on or activate, the
StabiliTrak
®light along with one of the following
messages will be displayed on the Driver
Information Center (DIC) (TRACTION CONTROL
OFF, SERVICE TRACTION CONTROL,
STABILITRAK OFF, SERVICE STABILITRAK).
For 2500 series vehicles, if the vehicle has gone
through heavy acceleration or braking during
the rst 2 miles (3.2 km) after starting your vehicle,
these messages may also appear.For 1500 series vehicles, if these DIC messages
appear, make sure the StabiliTrack
®system
has not been turned off, then turn the steering
wheel through either the ten or two o’clock
positions. If this does not clear the message(s),
take your vehicle to the dealer for service. If this is
the case, your vehicle does not need servicing.
Turn your vehicle off and back on again to
reset the system. If any of these messages appear
on the Driver Information Center (DIC), and your
vehicle hasn’t gone through hard acceleration
or braking in the rst two miles, your vehicle
should be taken in for service. For more
information on the DIC messages, seeDriver
Information Center (DIC) on page 244.
The StabiliTrak
®light
will ash on the
instrument panel cluster
when the system is
both on and activated.
You may also feel or hear the system working;
this is normal.
348

Traction Control Operation
The traction control system is part of the
StabiliTrak®system. Traction control limits wheel
spin by reducing engine power to the wheels
(engine speed management) and by applying
brakes to each individual wheel (brake-traction
control) as necessary.
The traction control system is enabled
automatically when you start your vehicle. It will
activate and the StabiliTrak
®light will ash if
it senses that any of the wheels are spinning or
beginning to lose traction while driving. If you turn
off traction control, only the brake-traction
control portion of traction control will work. The
engine speed management will be disabled. In this
mode, engine power is not reduced automatically
and the driven wheels can spin more freely.
This can cause the brake-traction control to
activate constantly.
Notice:If you allow the wheel(s) of one axle to
spin excessively while the StabiliTrak
®, ABS
and brake warning lights and the SERVICE
STABILITRAK message are displayed, you
could damage the transfer case.The repairs would not be covered by your
warranty. Reduce engine power and do not spin
the wheel(s) excessively while these lights and
this message are displayed.
The traction control system may activate on
dry or rough roads or under conditions such as
heavy acceleration while turning or abrupt
upshifts/downshifts of the transmission. When this
happens, you may notice a reduction in
acceleration, or may hear a noise or vibration.
This is normal.
If your vehicle is in cruise control when the system
activates, the StabiliTrak
®light will ash and the
cruise control will automatically disengage.
When road conditions allow you to use cruise
again, you may re-engage the cruise control.
SeeCruise Control on page 196.
StabiliTrak
®may also turn off automatically if it
determines that a problem exists with the system.
If the problem does not clear itself after restarting
the vehicle, you should see your dealer for
service.
350

Off-road driving involves some new skills. And that
is why it is very important that you read this
guide. You will nd many driving tips and
suggestions. These will help make your off-road
driving safer and more enjoyable.
If you think you will need some more ground
clearance at the front of your vehicle, you
can remove the front fascia lower air dam.
The front fascia lower air dam is held in place by
two bolts and 10 snap features. The bolts and
snap features are accessible from underneath the
front fascia.
The following steps must be performed on the
bolts and snap features to remove the air dam:
1. Remove the 2 outboard air dam bolts.
2. With a at-blade screwdriver, push down on
the snap features and disengage the snaps.
3. After the bolts are removed and the snaps are
disengaged, push forward on the air dam until
it is free.
When you are back on roads, though, be sure to
replace the air dam.Notice:Operating your vehicle for extended
periods without the front fascia lower air dam
installed can cause improper air ow to the
engine. Always be sure to replace the front
fascia air dam when you are nished off-road
driving.
To reinstall the lower air dam do the following:
1. Line up the snap features and push the
air dam rearward to engage the snaps.
2. Install the 2 outboard bolts.
Before You Go Off-Roading
There are some things to do before you go out.
For example, be sure to have all necessary
maintenance and service work done. Check to
make sure all underbody shields, if the vehicle has
them, are properly attached. Be sure you read
all the information about your four-wheel-drive or
all-wheel-drive vehicle in this manual. Is there
enough fuel? Is the spare tire fully inated? Are the
uid levels up where they should be? What are
the local laws that apply to off-roading where you
will be driving? If you do not know, you should
check with law enforcement people in the
area. Will you be on someone’s private land?
If so, be sure to get the necessary permission.
357

After Off-Road Driving
Remove any brush or debris that has collected on
the underbody, chassis, or under the hood.
These accumulations can be a re hazard.
After operation in mud or sand, have the brake
linings cleaned and checked. These substances
can cause glazing and uneven braking. Check the
body structure, steering, suspension, wheels,
tires, and exhaust system for damage. Also, check
the fuel lines and cooling system for any leakage.
Your vehicle will require more frequent service
due to off-road use. Refer to the Maintenance
Schedule for additional information.
Driving at Night
Night driving is more dangerous than day driving.
One reason is that some drivers are likely to
be impaired — by alcohol or drugs, with night
vision problems, or by fatigue.
Here are some tips on night driving.
Drive defensively.
Do not drink and drive.
Adjust the inside rearview mirror to reduce the
glare from headlamps behind you.
Since you cannot see as well, you may need
to slow down and keep more space between
you and other vehicles.
Slow down, especially on higher speed roads.
Your vehicle’s headlamps can light up only so
much road ahead.
In remote areas, watch for animals.
If you are tired, pull off the road in a safe
place and rest.
373