2007 GMC SIERRA service

4n(Four-Wheel-Drive Low):This setting also
engages the front axle and delivers extra
torque. You may never need this setting. It sends
maximum power to all four wheels. You might
choose Four-Wheel-Drive Low if you are driving
off-road in deep sand, deep mud, deep snow, and
while climbing or descending steep hills.
StabiliTrak
®will not engage in this mode. See
StabiliTrak®System on page 381for more
information.
{CAUTION:
Shifting the transfer case to NEUTRAL
can cause your vehicle to roll even if the
transmission is in PARK (P). You or
someone else could be seriously injured.
Be sure to set the parking brake before
placing the transfer case in NEUTRAL.
SeeParking Brake on page 162.N (NEUTRAL):Shift the vehicle’s transfer case to
NEUTRAL only when towing your vehicle. See
Recreational Vehicle Towing on page 439or
Towing Your Vehicle on page 439for more
information.
If the SERVICE 4–Wheel Drive message stays on,
you should take your vehicle to your dealer for
service. See “Service 4–Wheel Drive message”
underDIC Warnings and Messages on page 279.
Shifting Into Four-Wheel-Drive High or
AUTO (Automatic Four-Wheel Drive)
Turn the knob to the Four-Wheel-Drive High or
AUTO position. This can be done at any speed,
except when shifting from Four-Wheel-Drive
Low, and the indicator light will ash while shifting.
It will remain on when the shift is completed.
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{CAUTION:
Four-wheel drive vehicles with the transfer
case in NEUTRAL will allow the vehicle to
roll, even if the shift lever is in PARK (P).
So, be sure the transfer case is in a drive
gear — not in NEUTRAL. Always set the
parking brake.
Follow the proper steps to be sure your vehicle
will not move. SeeShifting Into Park (P) on
page 163.
If you are pulling a trailer, seeTowing a Trailer
on page 445.
Mirrors
Manual Rearview Mirror
Pull or push the tab under the inside rearview
mirror to adjust it to the night or daytime setting. In
the nighttime setting, the glare from headlamps
behind the vehicle will be less intense.
Automatic Dimming Rearview Mirror
with OnStar
®, Compass and
Temperature Display
Your vehicle may have this feature. When on, the
automatic dimming mirror dims to the proper level
to minimize glare from lights behind you after dark.
The mirror has a dual display in the upper right
corner of the mirror face that shows the compass
reading and the outside temperature.
Control buttons for the OnStar
®system are at the
bottom of the mirror. SeeOnStar®System on
page 180for more information about the services
OnStar
®provides.
P(On/Off):This is the on/off button.
169

OnStar®System
OnStar®uses several innovative technologies and
live advisors to provide you with a wide range
of safety, security, information, and convenience
services. If your airbags deploy, the system is
designed to make an automatic call to OnStar
®
Emergency advisors who can request emergency
services be sent to your location. If you lock
your keys in the vehicle, call OnStar
®at
1-888-4-ONSTAR and they can send a signal to
unlock your doors. If you need roadside
assistance, press the OnStar
®button and they
can contact Roadside Service for you.
OnStar
®service is provided to you subject to the
OnStar®Terms and Conditions. You may
cancel your OnStar®service at any time by
contacting OnStar®as provided below. A completeOnStar
®Owners Guide and the OnStar®Terms
and Conditions are included in the vehicle’s
OnStar
®Subscriber glove box literature. For more
information, visit onstar.com or onstar.ca,
contact OnStar
®at 1-888-4-ONSTAR
(1-888-466-7827) or TTY 1-877-248-2080, or
press the OnStar
®button to speak with an
OnStar®advisor 24 hours a day, 7 days a week.
Not all OnStar
®features are available on all
vehicles. To check if your vehicle is equipped to
provide the services described below, or for a
full description of OnStar
®services and system
limitations, see the OnStar®Owner’s Guide in your
glove box or visit onstar.com.
OnStar®Services
For new vehicles with OnStar®, the Safe & Sound
Plan, or the Directions & Connections®Plan is
included for one year from the date of purchase.
You can extend this plan beyond the rst year,
or upgrade to the Directions & Connections
®Plan.
For more information, press the OnStar®button
to speak with an advisor. Some OnStar®services
(such as Remote Door Unlock or Stolen Vehicle
Location Assistance) may not be available
until you register with OnStar
®.
180

Available Services with Safe &
Sound®Plan

Automatic Notication of Airbag Deployment
Advanced Automatic Crash Notication
(AACN) (If equipped)
Link to Emergency Services
Roadside Assistance
Stolen Vehicle Location Assistance
AccidentAssist
Remote Door Unlock/Vehicle Alert
OnStar®Vehicle Diagnostics
GM Goodwrench®On Demand Diagnostics
OnStar®Hands-Free Calling with
30 complimentary minutes
OnStar®Virtual Advisor (U.S. Only)
Available Services included with Directions
& Connections®Plan

All Safe and Sound Plan Services
Driving Directions - Advisor delivered or
OnStar®Turn-by-Turn Navigation (If equipped)
RideAssist
Information and Convenience Services
OnStar®Hands-Free Calling
OnStar®Hands-Free Calling allows eligible
OnStar®subscribers to make and receive calls
using voice commands. Hands-Free Calling is fully
integrated into the vehicle, and can be used
with OnStar
®Pre-Paid Minute Packages.
Hands-Free Calling may also be linked to a
Verizon Wireless service plan in the U.S. or a Bell
Mobility service plan in Canada, depending on
eligibility. To nd out more, refer to the OnStar
®
Owners Guide in the vehicle’s glove box, visit
www.onstar.com or www.onstar.ca, or speak with
an OnStar
®advisor by pressing the OnStar®
button or calling 1-888-4-ONSTAR
(1-888-466-7827).
181

OnStar®Virtual Advisor
OnStar®Virtual Advisor is a feature of OnStar®
Hands-Free Calling that uses your minutes to
access location-based weather, local traffic reports,
and stock quotes. By pressing the phone button
and giving a few simple voice commands, you can
browse through the various topics. See the OnStar
®
Owners Guide for more information (Only available
in the continental U.S.).
OnStar®Steering Wheel Controls
Your vehicle may have a Talk/Mute button that
can be used to interact with OnStar®Hands-Free
Calling. SeeAudio Steering Wheel Controls on
page 368for more information.
On some vehicles, you may have to hold the
button for a few seconds and give the command
“ONSTAR” in order to activate the OnStar
®
Hands-Free Calling feature.
On some vehicles, the mute button can be used to
dial numbers into voicemail systems, or to dial
phone extensions. See the OnStar
®Owner’s
Guide for more information.
How OnStar®Service Works
In order to provide you with OnStar®services,
your vehicle’s OnStar®system has the capability
of recording and transmitting vehicle information.
This information is automatically sent to an
OnStar
®Call Center at the time of an OnStar®
button press, Emergency button press or if
your airbags or AACN system deploys. The vehicle
information usually includes your GPS location
and, in the event of a crash, additional information
regarding the accident that your vehicle has
been involved in (e.g. the direction from which
your vehicle was hit). When you use the Virtual
Advisor feature of OnStar
®Hands-Free Calling,
your vehicle also sends OnStar®your GPS
location so that we can provide you with
location-based services.
182

OnStar®service cannot work unless your vehicle
is in a place where OnStar®has an agreement
with a wireless service provider for service in that
area. OnStar
®service also cannot work unless
you are in a place where the wireless service
provider OnStar
®has hired for that area
has coverage, network capacity and reception
when the service is needed, and technology that
is compatible with the OnStar
®service. Not all
services are available everywhere, particularly in
remote or enclosed areas, or at all times.
OnStar
®service that involves location information
about your vehicle cannot work unless GPS
satellite signals are unobstructed and available in
that place as well.Your 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 to you
at any particular time or place. Some examples are
damage to important parts of your vehicle in an
accident, hills, tall buildings, tunnels, weather
or wireless phone network congestion.
Your Responsibility
You may need to increase the volume of your
radio to hear the OnStar®advisor. If the light next
to the OnStar®buttons is red, this means that
your system is not functioning properly and should
be checked by your dealer/retailer. If the light
appears clear (no light is appearing), your OnStar
®
subscription has expired. You can always press
the OnStar®button to conrm that your OnStar®
equipment is active.
183

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 modications to this system by other
than an authorized service facility could void
authorization to use this equipment.
Universal Home Remote System
Operation (With One Triangular LED)
If there is one triangular Light Emitting
Diode (LED) indicator light above the
Universal Home Remote buttons, follow the
instructions below.
Do not use the Universal Home Remote with any
garage door opener that does not have the stop
and reverse feature. This includes any garage door
opener model manufactured before April 1, 1982. If
you have a newer garage door opener with rolling
codes, please be sure to follow Steps 6 through 8 to
complete the programming of your Universal Home
Remote Transmitter.
185

Auxiliary Roof Mounted Lamp
If your vehicle has this feature, this button includes
wiring provisions for a dealer or a qualied
service center to install an auxiliary roof lamp.
This button is located
on the overhead
console.
When the wiring is connected to an auxiliary roof
mounted lamp, pressing the bottom of the
button will activate the lamp and illuminate an
indicator light at the bottom of this button. Pressing
the top of the button will turn off the roof mounted
lamp and indicator.
The emergency roof lamp circuit is fused at
30 amps, so the total current draw of the attached
lamps should be less than this value. The
attachment points for the roof lamp circuits are
two blunt cut wires located above the overhead
console, a dark green switched power wire and a
black ground wire.For further information on roof mount emergency
lamp installation, please visit the GM Uptter
website at www.gmuptters.com or contact
your dealer.
If your vehicle has this button, your vehicle may
have the snow plow prep package. For further
information seeAdding a Snow Plow or Similar
Equipment on page 432.
Instrument Panel Brightness
D(Instrument Panel Brightness):This
feature controls the brightness of the instrument
panel lights.
The knob for this feature is located next to the
headlamp control.
Turn the knob clockwise or counterclockwise to
adjust the brightness of the instrument panel lights.
Turn the knob clockwise to return the instrument
panel cluster or radio display to full brightness
when the headlamps or parking lamps are on. To
turn on the dome lamps, turn the knob to the
farthest clockwise position.
225