Head Restraints
Front Seats
Rear Seats
Safety Belts
Child Restraints
Airbag System
Restraint System Check
Features and Controls
Keys
Doors and Locks
Windows
Theft-Deterrent Systems
Starting and Operating Your Vehicle
Mirrors
Object Detection Systems
OnStar
Universal Home Remote System
Storage Areas
Sunroof
Instrument Panel Overview
Climate Controls
Warning Lights, Gages, and Indicators
Driver Information Center (DIC)
Audio System(s)
Driving Your Vehicle
Your Driving, the Road, and the Vehicle
Towing
Service and Appearance Care
Service
Fuel
Checking Things Under the Hood
Rear Axle
Four-Wheel Drive
Front Axle
Noise Control System
Headlamp Aiming
Bulb Replacement
Windshield Wiper Blade Replacement
GENERAL MOTORS, GM, the GM Emblem, GMC,
the GMCTruck Emblem, and the name SIERRA are
registered trademarks of General Motors Corporation.
This manual includes the latest information at the time it
was printed. GM reserves the right to make changes after
that time without further notice. For vehicles first sold in
Canada, substitute the name “General Motors of Canada
Limited” for GMC wherever it appears in this manual.
This manual describes features that may or may not be
on your specific vehicle.
Read this manual from beginning to end to learn about
the vehicle’s features and controls. Pictures, symbols,
and words work together to explain vehicle operation.
If the vehicle has the DURAMAX
the DURAMAX
specific information on this engine.
Keep this manual in the vehicle for quick reference.
®
Diesel supplement for additional and
®
Diesel engine, refer to
Canadian Owners
Canadian Owners
(Propriétaires Canadiens)
A French language copy of this manual can be obtained
from your dealer/retailer or from:
On peut obtenir un exemplaire de ce guide en français
auprès du concessionnaire ou à l’adresse suivante:
Helm, Incorporated
P.O. Box 07130
Detroit, MI 48207
1-800-551-4123
Numéro de poste 6438 de langue française
www.helminc.com
Index
To quickly locate information about the vehicle, use 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.
Litho in U.S.A.
Part No. 15911381 B Second Printing
2008 General Motors Corporation. All Rights Reserved.
iii
Safety Warnings and Symbols
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.”
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.
A notice tells about something that can damage the
vehicle.
Notice: These mean there is something that could
damage your vehicle.
Many times, this damage would not be covered by the
vehicle’s warranty, and it could be costly. The notice
tells what to do to help avoid the damage.
There are also warning labels on the vehicle which use
the same words, CAUTION or Notice.
Vehicle Symbols
The vehicle has components and labels that use
symbols instead of text. Symbols are shown along
with the text describing the operation or information
relating to a specific component, control, message,
gage, or indicator.
M : This symbol is shown when you need to see your
owner manual for additional instructions or information.
Cautions tell what the hazard is and what to do to avoid
or reduce the hazard. Read these cautions.
iv
* : This symbol is shown when you need to see a
service manual for additional instructions or information.
Vehicle Symbol Chart
Here are some additional symbols that may be found on
the vehicle and what they mean. For more information
on the symbol, refer to the index.
0 : Adjustable Pedals9 : Airbag Readiness Light# : Air Conditioning
! : Antilock Brake System (ABS)g : Audio Steering Wheel Controls or OnStar
®
$ : Brake System Warning Light
" : Charging System
I : Cruise Control
B : Engine Coolant Temperature
O : Exterior Lamps
# : Fog Lamps
. : Fuel Gage
+ : Fuses
i : Headlamp High/Low-Beam Changer
j : LATCH System Child Restraints
* : Malfunction Indicator Lamp
: : Oil Pressure
g : Outside Power Foldaway Mirrors
} : Power
/ : Remote Vehicle Start
> : Safety Belt Reminders
7 : Tire Pressure Monitor
_ : Tow/Haul Mode
F : Traction Control
M : Windshield Washer Fluid
v
✍ NOTES
vi
Section 1Seats and Restraint System
Head Restraints ...............................................1-3
Front Seats ......................................................1-4
Restraint System Check ..................................1-91
Checking the Restraint Systems ......................1-91
Replacing Restraint System Parts After
a Crash ...................................................1-92
Head Restraints
The front seats have adjustable head restraints in the
outboard seating positions.
{ CAUTION:
With head restraints that are not installed and
adjusted properly, there is a greater chance that
occupants will suffer a neck/spinal injury in a
crash. Do not drive until the head restraints for all
occupants are installed and adjusted properly.
Adjust the head restraint so that the top of the restraint is
at the same height as the top of the occupant’s head.
This position reduces the chance of a neck injury in a
crash.
1-3
Pull the head restraint up to raise it. To lower the head
restraint, press the button, located on the top of the
seatback, and push the restraint down.
Push down on the head restraint after the button is
released to make sure that it is locked in place.
The head restraints are not designed to be removed.
The rear seat has head rests that can be adjusted
up and down.
Front Seats
Manual Seats
{ CAUTION:
You can lose control of the vehicle if you try to
adjust a manual driver’s seat while the vehicle is
moving. The sudden movement could startle and
confuse you, or make you push a pedal when you
do not want to. Adjust the driver’s seat only when
the vehicle is not moving.
1-4
If the vehicle has a manual seat, it can be moved
forward or rearward.
1. Lift the bar to unlock
the seat.
2. Slide the seat to the
desired position and
release the bar.
Power Seats
Try to move the seat with your body to be sure the seat
is locked in place.
Driver’s Seat with Power Seat Control, Power
Recline, and Power Lumbar shown
On a vehicle with power seats, the controls used to
operate them are located on the outboard side of the
seats.
Move the seat forward or rearward by sliding the control
forward or rearward.
1-5
Your vehicle may have additional features to adjust your
vehicle’s power seat:
• Raise or lower the front part of the seat cushion by
moving the front of the control up or down.
• Raise or lower the rear part of the seat cushion by
moving the rear of the control up or down.
• Raise or lower the entire seat by moving the entire
control up or down.
On seats with power reclining seatbacks, the control is
located behind the power seat control on the outboard
side of the seats. See “Power Reclining Seatbacks”
under Reclining Seatbacks on page 1-10.
A vehicle with a memory function allows seat settings to
be saved and recalled. See Memory Seat, Mirrors,and Pedals on page 1-8 for more information.
Manual Lumbar
On vehicles with this feature the control is located on
the outboard side of the seat.
Increase or decrease lumbar support by turning the
knob forward or rearward.
1-6
Power Lumbar
On seats with power lumbar, the controls used to operate
this feature are located on the outboard side of the seats.
• To increase lumbar support, press and hold the front
of the control.
• To decrease lumbar support, press and hold the rear
of the control.
The vehicle may have additional features to adjust your
vehicle’s power seat:
• To raise the height of the lumbar support, press
and hold the top of the control.
• To lower the height of the lumbar support, press
and hold the bottom of the control.
Release the control when the lower seatback reaches
the desired level of lumbar support.
Your vehicle may have a memory function which allows
seat settings to be saved and recalled. See MemorySeat, Mirrors, and Pedals on page 1-8 formore
information.
Keep in mind that as your seating position changes,
as it may during long trips, so should the position of
your lumbar support. Adjust the seat as needed.
1-7
Heated Seats
On vehicles with heated front seats, the controls are
located on the driver and passenger doors.
I (Heated Seatback): Press to turn on the heated
seatback.
J (Heated Seat and Seatback): Press to turn on the
heated seat and seatback.
The lighton thebutton will come on to indicate thatthe
feature is working. Press the button to cycle through the
temperature settings of high, medium, and low and to turn
the heat to the seat off. Indicator lights will show the level
of heat selected: three for high, two for medium, and one
for low.
The heated seats will be canceled 10 secondsafter the
ignition is turned off. To use the heated seat feature after
restarting the vehicle, press the heated seat or seatback
button again.
Memory Seat, Mirrors, and Pedals
Your vehicle may have the memory package.
The controls for this feature
are located on the driver’s
door panel, and are used to
program and recall memory
settings for the driver’s
seat, outside mirrors, and
the adjustable throttle and
brake pedal.
To save seating positions in memory:
1. Adjust the driver’s seat, including the seatback
recliner and lumbar, both outside mirrors, and the
throttle and brake pedals to a comfortable position.
See Outside Power Mirrors on page 2-58 and
Adjustable Throttle and Brake Pedal on page 2-26
for more information.
Not all mirrors, adjustable throttles and brake pedals,
or power lumbar will have the ability to save and
recall their positions.
2. Press and hold button 1 until two beeps sound to
indicate that the position has been stored.
1-8
A second seating, lumbar, mirror, and throttle and brake
pedal position can be programmed by repeating the
above steps and pressing button 2.
To recallthe memory positions, the vehicle must be in
PARK (P).Press andrelease eitherbutton 1 or button 2
corresponding to the desired driving position. The seat,
outside mirrors, and adjustable throttle and brake pedals
will move to the position previously stored. You will hear a
single beep.
If youuse the remote keyless entry transmitter to enter
your vehicle and the remote recall memory feature is on,
automatic seat, adjustable mirror, and adjustable pedal
movements will occur. See “MEMORY SEAT RECALL”
under DIC Vehicle Customization (With DIC Buttons) onpage 3-75for moreinformation.
To stoprecall movement of the memory function at any
time, press one of the power seat controls, memory
buttons, power mirror buttons, or adjustable pedal switch.
If somethinghas blocked the driver’s seat and/or the
adjustable pedals while recalling a memory position, the
driver’s seat and/or the adjustable pedals recall may stop
working. If this happens, remove the obstruction and
press the appropriate control for the area that is not
responding for two seconds. Try recalling the memory
position again by pressing the appropriate memory
button. If the memory position is still not recalling, see
your dealer for service.
Easy Exit Seat
The control for this feature is located on the driver’s
door panel between buttons 1 and 2.
With the vehicle in PARK (P), the driver’s seat exit
position can be recalled by pressing the exit button.
You will hear a single beep, and the driver’s seat
will move back.
If the easy exit seat feature is programmed in the Driver
Information Center (DIC), automatic seat movement
will occur when the key is removed from the ignition.
See “EASY EXIT SEAT” under DIC VehicleCustomization (With DIC Buttons) on page 3-75 for
more information.
The memory seat and easy exit features can also be
programmed using the DIC.
For programming information, see DIC VehicleCustomization (With DIC Buttons) on page 3-75.
1-9
Reclining Seatbacks
{ CAUTION:
{ CAUTION:
You can lose control of the vehicle if you try to
adjust a manual driver’s seat while the vehicle is
moving. The sudden movement could startle and
confuse you, or make you push a pedal when you
do not want to. Adjust the driver’s seat only when
the vehicle is not moving.
1-10
If either seatback is not locked, it could move
forward in a sudden stop or crash. That could
cause injury to the person sitting there. Always
push and pull on the seatbacks to be sure they
are locked.
{ CAUTION:
Sitting in a reclined position when your vehicle is
in motion can be dangerous. Even if you buckle
up, your safety belts cannot do their job when you
are reclined like this.
The shoulder belt cannot do its job. In a crash, you
could go into it, receiving neck or other injuries.
The lap belt cannot do its job either. In a crash the
belt could go up over your abdomen. The belt
forces would be there, not at your pelvic bones.
This could cause serious internal injuries.
For proper protection when the vehicle is in motion,
have the seatback upright. Then sit well back in the
seat and wear your safety belt properly.
1-11
Manual Reclining Seatbacks
On seats with manual reclining seatbacks, the lever
used to operate them is located on the outboard side
of the seat(s).
To recline the seatback:
1. Lift the recline lever.
2. Move the seatback to the desired position, then
release the lever to lock the seatback in place.
3. Push and pull on the seatback to make sure it is
locked.
To return the seatback to an upright position, do the
following:
1. Lift the lever fully without applying pressure to the
seatback and the seatback will return to the upright
position.
2. Push and pull on the seatback to make sure it is
locked.
1-12
Power Reclining Seatbacks
Seatback Latches
The front seatbacks tilt forward to allow access to the
rear of the cab.
To tilt the seatback forward, lift the lever located on the
outboard side of the seat cushion.
{ CAUTION:
If either seatback is not locked, it could move
forward in a sudden stop or crash. That could
cause injury to the person sitting there. Always
push and pull on the seatbacks to be sure they
are locked.
If the seats have power reclining seatbacks, the control
used to recline them is located on the outboard side
of the seat behind the power seat control.
• To recline the seatback, tilt the top of the control
rearward.
• To bring the seatback forward, tilt the top of the
control forward.
Do not have a seatback reclined if your vehicle is moving.
To return the seatback to the upright position, push the
seatback rearward until it latches. After returning the
seatback to its upright position, push and pull on
the seatback to make sure it is locked.
Center Seat
Your vehicle may have a front center seat. The seatback
doubles as an armrest and cupholder/storage area for the
driver and passenger when the center seat is not used.
Do not use it as a seating position when the seatback is
folded down.
1-13
Rear Seats
Rear Seat Operation (Extended Cab
Full Bench)
Folding the Rear Seat
To fold the seat up, do the following:
Notice: Folding a rear seat with the safety belts
still fastened may cause damage to the seat or the
safety belts. Always unbuckle the safety belts
and return them to their normal stowed position
before folding a rear seat.
1. Pull up on the front of
the seat cushion while
pulling down on the
release strap, located
under the seat cushion.
2. Pull the seat cushion up until it latches with the
seatback.
3. After latching the seat cushion up, pull forward on it
to make sure it is locked.
To fold the seat down, do the following:
1. Push the seat cushion rearward while pulling the
release strap, located under the seat cushion.
Pull the seat cushion down until it latches.
2. After latching the seat cushion, pull up on it to
make sure it is locked.
1-14
Rear Seat Operation (All Split
Bench and Hybrid Full Bench)
{ CAUTION:
Folding Rear Seat
On a vehicle with a second row 60/40 split seat either
side of the rear seat may be folded for added cargo
space.
Notice: Folding a rear seat with the safety belts
still fastened may cause damage to the seat or the
safety belts. Always unbuckle the safety belts
and return them to their normal stowed position
before folding a rear seat.
Make sure that nothing is on the seat.
To fold the seat, slowly pull the seat cushion up.
To return the seat to the normal seating position, slowly
pull the seat cushion down.
A safety belt that is improperly routed, not properly
attached, or twisted will not provide the protection
needed in a crash. The person wearing the belt
could be seriously injured. After raising the rear
seatback, always check to be sure that the safety
belts are properly routed and attached, and are
not twisted.
1-15
Safety Belts
CAUTION:(Continued)
Safety Belts: They Are for Everyone
This part of the manual tells you how to use safety
belts properly. It also tells you some things you should
not do with safety belts.
{ CAUTION:
Do not let anyone ride where a safety belt cannot
be worn properly. In a crash, if you or your
passenger(s) are not wearing safety belts, the
injuries can be much worse. You can hit things
inside the vehicle harder or be ejected from the
CAUTION: (Continued)
1-16
vehicle. You and your passenger(s) can be
seriously injured or killed. In the same crash, you
might not be, if you are buckled up. Always fasten
your safety belt, and check that your passenger(s)
are restrained properly too.
{ CAUTION:
People riding on the tailgate (if equipped) can
easily lose their balance and fall even when the
vehicle is operated at low speeds. Falling from a
moving vehicle may result in serious injuries or
death.
{ CAUTION:
It isextremely dangerous to ride in a cargo area,
inside or outside of a vehicle. In a collision, people
riding in these areas are more likely to be seriously
injured or killed. Do not allow people to ride in any
area of your vehicle that is not equipped with seats
and safety belts. Be sure everyone in your vehicle is
in a seat and using a safety belt properly.
Your vehicle has indicators as a reminder to buckle your
safety belts. See Safety Belt Reminders on page 3-36.
In most states and in all Canadian provinces, the
law requires wearing safety belts. Here is why:
You never know if you will be in a crash. If you do have
a crash, you do not know if it will be a serious one.
A few crashes are mild, and some crashes can be so
serious that even buckled up, a person would not
survive. But most crashes are in between. In many of
them, people who buckle up can survive and sometimes
walk away. Without belts they could have been badly
hurt or killed.
After more than 40 years of safety belts in vehicles, the
facts are clear. In most crashes buckling up does
matter... a lot!
1-17
Why Safety Belts Work
When you ride in or on anything, you go as fast as
it goes.
Take the simplest vehicle. Suppose it is just a seat on
wheels.
Put someone on it.
1-18
Get it up to speed. Then stop the vehicle. The rider
does not stop.
The person keeps going until stopped by something.
In a real vehicle, it could be the windshield...
1-19
or the instrument panel...or the safety belts!
With safety belts, you slow down as the vehicle does.
You get more time to stop. You stop over more distance,
and your strongest bones take the forces. That is why
safety belts make such good sense.
1-20
Questions and Answers About Safety
Belts
Q: Will I be trapped in the vehicle after a crash if I
am wearing a safety belt?
A: You could be — whether you are wearing a safety
belt or not. But your chance of being conscious
during and after an accident, so you can unbuckle
and get out, is much greater if you are belted.
And you can unbuckle a safety belt, even if you are
upside down.
Q: If my vehicle has airbags, why should I have to
wear safety belts?
A: Airbags are supplemental systems only; so they
work with safety belts — not instead of them.
Whether or not an airbag is provided, all occupants
still have to buckle up to get the most protection.
That is true not only in frontal collisions, but
especially in side and other collisions.
Q: If I am a good driver, and I never drive far from
home, why should I wear safety belts?
A: You may be an excellent driver, but if you are in a
crash — even one that is not your fault — you and
your passenger(s) can be hurt. Being a good
driver does not protect you from things beyond your
control, such as bad drivers.
Most accidents occur within 25 miles (40 km) of
home. And the greatest number of serious injuries
and deaths occur at speeds of less than 40 mph
(65 km/h).
Safety belts are for everyone.
1-21
How to Wear Safety Belts Properly
This section is only for people of adult size.
Be aware that there are special things to know about
safety belts and children. And there are different rules for
smaller children and infants. If a child will be riding in the
vehicle, see Older Children on page 1-38 orInfants andYoung Children on page 1-41. Followthose rulesfor
everyone’s protection.
It is very important for all occupants to buckle up.
Statistics show that unbelted people are hurt more often
in crashes than those who are wearing safety belts.
Occupants who are not buckled up can be thrown out of
the vehicle in a crash. And they can strike others in
the vehicle who are wearing safety belts.
First, before you or your passenger(s) wear a safety
belt, there is important information you should know.
Sit upstraight andalways keep your feet on the floorin
front of you. The lap part of the belt should be worn low
and snug on the hips, just touching the thighs. In a crash,
this applies force to the strong pelvic bones and you
would be less likely to slide under the lap belt. If you slid
under it, the belt would apply force on your abdomen.
This could cause serious or even fatal injuries. The
shoulder belt should go over the shoulder and across the
chest. These parts of the body are best able to take belt
restraining forces.
The shoulder belt locks if there is a sudden stop or
crash.
1-22
Q: What is wrong with this?
A: The shoulder belt is too loose. It will not give as
much protection this way.
{ CAUTION:
You can be seriously hurt if your shoulder belt is
too loose. In a crash, you would move forward too
much, which could increase injury. The shoulder
belt should fit snugly against your body.
1-23
Q: What is wrong with this?
A: The lap belt is too loose. It will not give nearly as
much protection this way.
{ CAUTION:
You can be seriously hurt if your lap belt is too
loose. In a crash, you could slide under the lap
belt and apply force on your abdomen. This could
cause serious or even fatal injuries. The lap belt
should be worn low and snug on the hips, just
touching the thighs.
1-24
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