index GMC YUKON 2008 Owner's Manual

Seats and Restraint Systems........................... 1-1
Front Seats
............................................... 1-2
Rear Seats
..............................................1-11
Safety Belts
.............................................1-30
Child Restraints
.......................................1-51
Airbag System
.........................................1-76
Restraint System Check
............................1-92
Features and Controls..................................... 2-1
Keys
........................................................ 2-3
Doors and Locks
......................................2-10
Windows
.................................................2-19
Theft-Deterrent Systems
............................2-22
Starting and Operating Your Vehicle
...........2-26
Mirrors
....................................................2-49
Object Detection Systems
..........................2-58
OnStar
®System
......................................2-60
Universal Home Remote System
................2-64
Storage Areas
.........................................2-71
Sunroof
..................................................2-74
Instrument Panel............................................. 3-1
Instrument Panel Overview
.......................... 3-4
Climate Controls
......................................3-23
Warning Lights, Gages, and Indicators
........3-37
Driver Information Center (DIC)
..................3-55
Audio System(s)
.......................................3-81Driving Your Vehicle....................................... 4-1
Your Driving, the Road, and Your Vehicle
..... 4-2
Towing
...................................................4-45
Service and Appearance Care.......................... 5-1
Service
..................................................... 5-3
Fuel
......................................................... 5-5
Checking Things Under the Hood
...............5-12
Rear Axle
...............................................5-52
Four-Wheel Drive
.....................................5-54
Front Axle
...............................................5-55
Headlamp Aiming
.....................................5-56
Bulb Replacement
....................................5-59
Windshield Wiper Blade Replacement
.........5-62
Tires
......................................................5-64
Appearance Care
...................................5-108
Vehicle Identication
...............................5-116
Electrical System
....................................5-117
Capacities and Specications
...................5-124
Maintenance Schedule..................................... 6-1
Maintenance Schedule
................................ 6-2
Customer Assistance Information.................... 7-1
Customer Assistance and Information
........... 7-2
Reporting Safety Defects
...........................7-14
Vehicle Data Recording and Privacy
...........7-16
Index................................................................ 1
2008 GMC Yukon, Yukon XL Owner ManualM

Using this Manual
Many people read the owner manual from beginning to
end when they rst receive their new vehicle to learn
about the vehicle’s features and controls. Pictures
and words work together to explain things.
If your vehicle is a Two-mode Hybrid, see the Two-mode
Hybrid manual for more information.
Index
A good place to quickly locate information about the
vehicle is the Index in the back of the manual. It is an
alphabetical list of what is in the manual and the
page number where it can be found.
Safety Warnings and Symbols
There are a number of safety cautions in this book. A
box with the word CAUTION is used to tell about things
that could hurt you or others if you were to ignore the
warning.
{CAUTION:
These mean there is something that could hurt
you or other people.
We tell you what the hazard is and what to do to help
avoid or reduce the hazard. Please read these cautions.
If you do not, you or others could be hurt.
A circle with a slash
through it is a safety
symbol which means “Do
Not,” “Do Not do this”
or “Do Not let this happen.”
iii

Lap-Shoulder Belt
All seating positions in your vehicle have a lap-shoulder
except for the center front passenger position, if your
vehicle has one, which has a lap belt. SeeLap Belt on
page 1-49for more information.
Here is how to wear a lap-shoulder belt properly.
1. Adjust the seat, if the seat is adjustable, so you can
sit up straight. To see how, see “Seats” in the
Index.
2. Pick up the latch plate and pull the belt across you.
Do not let it get twisted.
The lap-shoulder belt may lock if you pull the belt
across you very quickly. If this happens, let the belt
go back slightly to unlock it. Then pull the belt
across you more slowly.
If you ever pull the shoulder portion of a passenger
belt out all the way, you may engage the child
restraint locking feature. If this happens, just let the
belt go back all the way and start again.
Engaging the child restraint locking feature may
affect the passenger sensing system. See
Passenger Sensing System on page 1-85.3. Push the latch plate into the buckle until it clicks. If
you nd that the latch plate will not go fully into the
buckle, see if you are using the correct buckle.
Pull up on the latch plate to make sure it is secure.
If the belt is not long enough, seeSafety Belt
Extender on page 1-50.
Make sure the release button on the buckle is
positioned so you would be able to unbuckle the
safety belt quickly if necessary.
1-43

For some children who have outgrown child restraints
and for very small adults, the passenger sensing system
may or may not turn off the right front passenger’s
frontal airbag, depending upon the person’s seating
posture and body build. Everyone in your vehicle who
has outgrown child restraints should wear a safety
belt properly — whether or not there is an airbag for that
person.
If a person of adult-size is sitting in the right front
passenger’s seat, but the off indicator is lit, it could be
because that person is not sitting properly in the seat. If
this happens, turn the vehicle off, remove any additional
material from the seat, such as blankets, cushions,
seat covers, seat heaters or seat massagers and ask
the person to place the seatback in the fully upright
position, then sit upright in the seat, centered on the seat
cushion, with the person’s legs comfortably extended.
Restart the vehicle and have the person remain in
this position for two to three minutes. This will allow the
system to detect that person and then enable the
right front passenger’s frontal airbag.Safety belts help keep the passenger in position on the
seat during vehicle maneuvers and braking, which
helps the passenger sensing system maintain the
passenger airbag status. See “Safety Belts” and “Child
Restraints” in the Index for additional information
about the importance of proper restraint use.
1-88

Power Liftgate
Power Liftgate Operation
{CAUTION:
It can be dangerous to drive with the liftgate
open because carbon monoxide (CO) gas can
come into your vehicle. You cannot see or
smell CO. It can cause unconsciousness and
even death.
If you must drive with the liftgate open, or if
electrical wiring or other cable connections
must pass through the seal between the body
and the liftgate:
Make sure all other windows are shut.
Turn the fan on your heating or cooling
system to its highest speed with the
recirculation mode off. That will force
outside air into your vehicle. See Climate
Control System in the index.
CAUTION: (Continued)
CAUTION: (Continued)

If you have air outlets on or under the
instrument panel, open them all the way.
If your vehicle has a power liftgate, disable
the power liftgate function.
SeePower Liftgate on page 2-15.
On vehicles with a power liftgate the button is located
on the center console.
The vehicle must be in PARK (P) to use the power
liftgate feature.
&:Press the top of the button to open or close the
power liftgate.
OFF:Press the bottom of the button for manual
operation of the power liftgate.
2-15

Radios with CD and DVD Audio Output
Only one audio source can be heard through the
speakers at a time. An audio source is dened as DVD
slot, CD slot, XM™, FM/AM, Front Auxiliary Jack, or
Rear Auxiliary Jack.
Press the
Obutton 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 3-115for more information.
In some vehicles, depending on audio options, the rear
speakers can be muted when the RSA power is
turned on. SeeRear Seat Audio (RSA) on page 3-125
for more information.
Playing an MP3 CD-R or CD-RW Disc
Radios with a Single CD or 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 could 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.
3-96

Playing a DVD
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 does 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 3-115
for more information.
O(Power):Press to turn the radio on or off. Turn
clockwise or counterclockwise to increase or decrease
the volume. Press and hold for more than two seconds to
turn off the radio and Rear Seat Entertainment (RSE)
system, and to start the parental control feature. Parental
control prevents the rear seat occupant from operating
the Rear Seat Audio (RSA) system or remote control.A lock symbol displays next to the clock display. The
parental control feature remains on until this knob is
pressed and held for more than two seconds again, or
until the driver turns the ignition off and exits the vehicle.
f(Tune):Turn to change tracks on a CD or DVD, to
manually tune a radio station, or to change clock or date
settings, while in the clock or date setting mode. See
the information given earlier in this section specic to the
radio, CD, and the DVD. Also, see “Setting the Clock”
in the index, for setting the clock and date.
©SEEK (Previous Track/Chapter):Press the left
arrow to return to the start of the current track or
chapter. Press the left arrow 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.
SEEK
¨(Next Track/Chapter):Press the right
arrow to go to the next track or chapter. This button
might not work when the DVD is playing the copyright
information or the previews.
sREV (Fast Reverse):Press to quickly reverse the
CD or DVD at ve times the normal speed. The radio
displays the elapsed time while in fast reverse. To stop
fast reversing, press again. This button might not
work when the DVD is playing the copyright information
or the previews.
3-98

Then, shut the engine off and close the window almost
all the way to preserve the heat. Start the engine
again and repeat this only when you feel really
uncomfortable from the cold. But do it as little as
possible. Preserve the fuel as long as you can. To help
keep warm, you can get out of the vehicle and do
some fairly vigorous exercises every half hour or so until
help comes.
If Your Vehicle is Stuck in Sand,
Mud, Ice, or Snow
Slowly and cautiously spin the wheels to free your
vehicle when stuck in sand, mud, ice, or snow. See
Rocking Your Vehicle to Get It Out on page 4-34.
If your vehicle has a traction system, it can often help to
free a stuck vehicle. Refer to your vehicle’s traction
system in the Index. If the stuck condition is too severe
for the traction system to free the vehicle, turn the
traction system off and use the rocking method.
{CAUTION:
If you let your vehicle’s tires spin at high
speed, they can explode, and you or others
could be injured. The vehicle can overheat,
causing an engine compartment re or other
damage. Spin the wheels as little as possible
and avoid going above 35 mph (55 km/h) as
shown on the speedometer.
For information about using tire chains on your vehicle,
seeTire Chains on page 5-86.
4-33

{CAUTION:
It can be dangerous to get out of your vehicle
if the shift lever is not fully in PARK (P) with
the parking brake rmly set. Your vehicle
can roll.
If you have left the engine running, the vehicle
can move suddenly. You or others could be
injured. To be sure your vehicle will not move,
even when you are on fairly level ground, use
the steps that follow.
Always put the shift lever fully in PARK (P)
with the parking brake rmly set.
If the transfer case on four-wheel-drive
vehicles is in NEUTRAL, your vehicle will
be free to roll, even if your shift lever is in
PARK (P). So, be sure the transfer case is
in a drive gear — not in NEUTRAL.
When You Are Ready to Leave After
Parking on a Hill
1. Apply your regular brakes and hold the pedal down
while you:
start your engine,
shift into a gear, and
release the parking brake.
2. Let up on the brake pedal.
3. Drive slowly until the trailer is clear of the chocks.
4. Stop and have someone pick up and store the
chocks.
Maintenance When Trailer Towing
Your vehicle will need service more often when you’re
pulling a trailer. See the Maintenance Schedule for more
on this. Things that are especially important in trailer
operation are automatic transmission uid (don’t overll),
engine oil, axle lubricant, belts, cooling system and
brake system. Each of these is covered in this manual,
and the Index will help you nd them quickly. If
you’re trailering, it’s a good idea to review these sections
before you start your trip.
Check periodically to see that all hitch nuts and bolts
are tight.
4-61

Tire Size
The following examples show the different parts of
a tire size.
(A) Passenger (P-Metric) Tire
:The United States
version of a metric tire sizing system. The letter
P as the rst character in the tire size means
a passenger vehicle tire engineered to standards
set by the U.S. Tire and Rim Association.(A) Light Truck (LT-Metric) Tire
:The United
States version of a metric tire sizing system. The
letters LT as the rst two characters in the tire
size means a light truck tire engineered to
standards set by the U.S. Tire and Rim
Association.
(B) Tire Width
:The three-digit number indicates
the tire section width in millimeters from sidewall
to sidewall.
(C) Aspect Ratio
:A two-digit number that
indicates the tire height-to-width measurements.
For example, if the tire size aspect ratio is 75, as
shown in item C of the light truck (LT-Metric) tire
illustration, it would mean that the tire’s sidewall is
75 percent as high as it is wide.
(D) Construction Code
:A letter code is used to
indicate the type of ply construction in the tire.
The letter R means radial ply construction;
the letter D means diagonal or bias ply
construction; and the letter B means belted-bias
ply construction.
(E) Rim Diameter
:Diameter of the wheel in
inches.
(F) Service Description
:The service description
indicates the load range and speed rating of a
tire. The load index can range from 1 to 279.
Speed ratings range from A to Z.
Passenger (P-Metric) Tire
Light Truck (LT-Metric) Tire
5-68