GENERAL MOTORS, GM, the GM Emblem, GMC,
the GMC Truck 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 rst 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 speci c 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
®Diesel engine, refer to
the DURAMAX®Diesel supplement for additional and
speci c information on this engine.
Keep this manual in the vehicle for quick reference.
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
Infants and Young Children
Everyone in a vehicle needs protection! This includes
infants and all other children. Neither the distance
traveled nor the age and size of the traveler changes
the need, for everyone, to use safety restraints. In fact,
the law in every state in the United States and in
every Canadian province says children up to some age
must be restrained while in a vehicle.
{CAUTION:
Children can be seriously injured or strangled if a
shoulder belt is wrapped around their neck and
the safety belt continues to tighten. Never leave
children unattended in a vehicle and never allow
children to play with the safety belts.Airbags plus lap-shoulder belts offer protection for
adults and older children, but not for young children
and infants. Neither the vehicle’s safety belt system
nor its airbag system is designed for them. Every
time infants and young children ride in vehicles, they
should have the protection provided by appropriate
child restraints.
Children who are not restrained properly can
strike other people, or can be thrown out of the
vehicle.
1-41
Outside Power Foldaway Mirrors
Vehicles with outside
power foldaway mirrors
have controls located
on the driver door.
Mirror Adjustment
1. Press (C) to fold the mirrors out to the driving
position.
2. Press (D) to fold the mirrors in to the folded
position.
Resetting the Power Foldaway Mirrors
Reset the power foldaway mirrors if:
The mirrors are accidentally obstructed while
folding.
They are accidentally manually folded/unfolded.
The mirrors will not stay in the unfolded position.
The mirrors vibrate at normal driving speeds.
Fold and unfold the mirrors one time using the mirror
controls to reset them to their normal position. A popping
noise may be heard during the resetting of the power
foldaway mirrors. This sound is normal after a manual
folding operation.
Automatic Dimming
The driver outside mirror adjusts for the glare of the
headlamps behind you. SeeAutomatic Dimming
Rearview Mirror on page 2-57for more information.
Turn Signal Indicator
The vehicle may also have a turn signal indicator on the
mirror. An arrow on the mirror ashes in the direction
of the turn or lane change.
2-59
When the System Does Not Seem To
Work Properly
The rear vision camera system might not work properly
or display a clear image if:
The RVC is turned off. See “Turning the Rear
Camera System On or Off” earlier in this section.
It is dark.
The sun or the beam of headlights is shining
directly into the camera lens.
Ice, snow, mud, or anything else builds up on the
camera lens. Clean the lens, rinse it with water,
and wipe it with a soft cloth.
The back of the vehicle is in an accident, the
position and mounting angle of the camera can
change or the camera can be affected. Be sure to
have the camera and its position and mounting
angle checked at your dealer/retailer.
There are extreme temperature changes.The rear vision camera system display in the rearview
mirror may turn off or not appear as expected due to
one of the following conditions. If this occurs the
left indicator light on the mirror will ash.
A slow ash may indicate a loss of video signal, or
no video signal present during the reverse cycle.
A fast ash may indicate that the display has been
on for the maximum allowable time during a
reverse cycle, or the display has reached an Over
Temperature limit.
The fast ash conditions are used to protect the
video device from high temperature conditions.
Once conditions return to normal the device
will reset and the green indicator will stop ashing.
During any of these fault conditions, the display will be
blank and the indicator will continue to ash as long
as the vehicle is in R (Reverse) or until the conditions
return to normal.
Pressing and holding
zwhen the left indicator light is
ashing will turn off the video display along with the
left indicator light.
2-69
Location information about the vehicle is only available
if the GPS satellite signals are unobstructed and
available.
The vehicle must have a working electrical system,
including adequate battery power, for the OnStar
equipment to operate. There are other problems OnStar
cannot control that may prevent OnStar from providing
OnStar service at any particular time or place. Some
examples are damage to important parts of the vehicle
in a crash, hills, tall buildings, tunnels, weather or
wireless phone network congestion.
Your Responsibility
Increase the volume of the radio if the OnStar advisor
cannot be heard. If the light next to the OnStar buttons
is red, the system may not be functioning properly.
Press the OnStar button and request a vehicle
diagnostic. If the light appears clear (no light is
appearing), your OnStar subscription has expired and
all services have been deactivated. Press the OnStar
button to con rm that the OnStar equipment is active.
Universal Home Remote
System
The Universal Home Remote System provides a way to
replace up to three hand-held Radio-Frequency (RF)
transmitters used to activate devices such as garage
door openers, security systems, and home lighting.
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received,
including interference that may cause undesired
operation.
This device complies with RSS-210 of Industry Canada.
Operation is subject to the following two conditions:
1. This device may not cause interference.
2. This device must accept any interference received,
including interference that may cause undesired
operation of the device.
Changes or modi cations to this system by other than
an authorized service facility could void authorization to
use this equipment.
2-73
Instrument Panel Overview...............................3-4
Instrument Panel Overview
(Base/Uplevel version).................................3-4
Instrument Panel Overview (Premium version). . . .3-6
Hazard Warning Flashers................................3-8
Horn .............................................................3-8
Tilt Wheel.....................................................3-8
Turn Signal/Multifunction Lever.........................3-9
Turn and Lane-Change Signals........................3-9
Headlamp High/Low-Beam Changer.................3-10
Flash-to-Pass...............................................3-10
Windshield Wipers........................................3-10
Rainsense™ II Wipers...................................3-11
Windshield Washer.......................................3-12
Cruise Control..............................................3-12
Exterior Lamps.............................................3-16
Headlamps on Reminder................................3-17
Daytime Running Lamps (DRL).......................3-17
Automatic Headlamp System..........................3-18
Puddle Lamps..............................................3-19
Fog Lamps ..................................................3-19
Auxiliary Roof-Mounted Lamp.........................3-19
Instrument Panel Brightness...........................3-20
Dome Lamps ...............................................3-20
Dome Lamp Override....................................3-20
Entry Lighting...............................................3-20
Exit Lighting.................................................3-20Reading Lamps............................................3-21
Cargo Lamp.................................................3-21
Electric Power Management...........................3-21
Battery Run-Down Protection..........................3-22
Accessory Power Outlet(s).............................3-22
Ashtray(s) and Cigarette Lighter......................3-23
Climate Controls............................................3-24
Climate Control System
(With Heater Only).....................................3-24
Climate Control System
(With Air Conditioning)...............................3-25
Dual Automatic Climate Control System...........3-27
Outlet Adjustment.........................................3-33
Warning Lights, Gages, and Indicators............3-33
Instrument Panel Cluster (US-Canada).............3-34
Speedometer and Odometer...........................3-35
Trip Odometer..............................................3-35
Tachometer.................................................3-35
Safety Belt Reminders...................................3-36
Airbag Readiness Light..................................3-37
Airbag Off Light............................................3-38
Passenger Airbag Status Indicator...................3-40
Charging System Light..................................3-41
Voltmeter Gage (US-Canada).........................3-41
Brake System Warning Light..........................3-42
Antilock Brake System (ABS) Warning Light.....3-43
Section 3 Instrument Panel
3-1
Turn Signal/Multifunction Lever
The lever on the left side of the steering column
includes the following:
G: Turn and Lane Change Signals
53: Headlamp High/Low-Beam Changer
N: Windshield Wipers
L: Windshield Washer
Flash-to-Pass.
Exterior Lamps.
Information for these features is on the pages following.
Turn and Lane-Change Signals
An arrow on the instrument
panel cluster ashes in the
direction of the turn or
lane change.
Move the lever all the way up or down to signal a turn.
Raise or lower the lever for less than one second until the
arrow starts to ash to signal a lane change. This causes
the turn signals to automatically ash three times. It will
ash six times if tow-haul mode is active. Holding the turn
signal lever for more than one second will cause the turn
signals to ash until you release the lever.
The lever returns to its starting position whenever it is
released.
If after signaling a turn or a lane change the arrows
ash rapidly or do not come on, a signal bulb could be
burned out.
Have the bulbs replaced. If the bulb is not burned out,
check the fuse. SeeFuses and Circuit Breakers on
page 5-124.
3-9