
When the System Does Not Seem to
Work Properly The driver disables the system.
The parking brake pedal is depressed.
The ultrasonic sensors are not clean. Keep your
vehicle’s rear bumper free of mud, dirt, snow,
ice and slush. For cleaning instructions, see
Washing Your Vehicle on page 5-102 .
A trailer was attached to your vehicle, or a bicycle
or an object was hanging out of your liftgate/liftglass
during your last drive cycle, the red light may
illuminate in the rear display. Once the attached
object is removed, URPA will return to normal
operation.
A tow bar is attached to your vehicle.
The vehicle’s bumper is damaged. Take the vehicle
to your dealer/retailer to repair the system.
Other conditions may affect system performance,
such as vibrations from a jackhammer or the
compression of air brakes on a very large truck.
If the system is still disabled, after driving forward at
least 15 mph (25 km/h), take your vehicle to your
dealer/retailer. 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.
2-50

Electric Power Management The vehicle has Electric Power Management (EPM) that
estimates the battery’s temperature and state of
charge. It then adjusts the voltage for best performance
and extended life of the battery.
When the battery’s state of charge is low, the voltage is
raised slightly to quickly put the charge back in. When
the state of charge is high, the voltage is lowered slightly
to prevent overcharging. If the vehicle has a voltmeter
gage or a voltage display on the Driver Information
Center (DIC), you may see the voltage move up
or down. This is normal. If there is a problem, an alert
will be displayed.
The battery can be discharged at idle if the electrical
loads are very high. This is true for all vehicles. This is
because the generator (alternator) may not be
spinning fast enough at idle to produce all the power
that is needed for very high electrical loads.
A high electrical load occurs when several of the
following loads are on: headlamps, high beams, fog
lamps, rear window defogger, climate control fan at high
speed, heated seats, engine cooling fans, trailer
loads, and loads plugged into accessory power outlets. EPM works to prevent excessive discharge of the
battery. It does this by balancing the generator’s output
and the vehicle’s electrical needs. It can increase
engine idle speed to generate more power, whenever
needed. It can temporarily reduce the power demands of
some accessories.
Normally, these actions occur in steps or levels, without
being noticeable. In rare cases at the highest levels
of corrective action, this action may be noticeable to the
driver. If so, a Driver Information Center (DIC)
message might be displayed, such as Battery Saver
Active or Service Battery Charging System. If this
message is displayed, it is recommended that the driver
reduce the electrical loads as much as possible. See
DIC Warnings and Messages on page 3-53 .
Battery Run-Down Protection This feature shuts off the dome lamps if they are left on
for more than 10 minutes when the ignition is in LOCK.
This will help prevent the battery from running down.
3-23

If the Light is Flashing The following can prevent more serious damage to your
vehicle:
Reduce vehicle speed.
Avoid hard accelerations.
Avoid steep uphill grades.
If you are towing a trailer, reduce the amount of
cargo being hauled as soon as it is possible.
If the light stops ashing and remains on steady, see “If
the Light Is On Steady” following.
If the light continues to ash, when it is safe to do so,
stop the vehicle. Find a safe place to park the vehicle.
Turn the ignition off, wait at least 10 seconds, and restart
the engine. If the light remains on steady, see “If the
Light Is On Steady” following. If the light is still ashing,
follow the previous steps and see your dealer/retailer
for service as soon as possible. If the Light Is On Steady You might be able to correct the emission system
malfunction by considering the following:
Did you recently put fuel into your vehicle?
If so, reinstall the fuel cap, making sure to fully install
the cap. See Filling the Tank on page 5-7 . The
diagnostic system can determine if the fuel cap has
been left off or improperly installed. A loose or missing
fuel cap allows fuel to evaporate into the atmosphere.
A few driving trips with the cap properly installed should
turn the light off.
Did you just drive through a deep puddle of water?
If so, your vehicle’s electrical system might be wet. The
condition is usually corrected when the electrical system
dries out. A few driving trips should turn the light off.
3-44

Your Driving, the Road, and Your Vehicle ......... .4-2
Defensive Driving .......................................... .4-2
Drunk Driving ................................................ .4-2
Control of a Vehicle ....................................... .4-3
Braking ........................................................ .4-3
Antilock Brake System (ABS) .......................... .4-4
Braking in Emergencies .................................. .4-5
Locking Differential ........................................ .4-5
Road Sensing Suspension .............................. .4-6
StabiliTrak ®
System ....................................... .4-6
All-Wheel Drive (AWD) System ........................ .4-8
Steering ....................................................... .4-9
Off-Road Recovery ...................................... .4-11
Passing ...................................................... .4-11
Loss of Control ............................................ .4-11
Off-Road Driving .......................................... .4-12
Driving at Night ........................................... .4-26 Driving in Rain and on Wet Roads ................. .4-27
Before Leaving on a Long Trip ...................... .4-28
Highway Hypnosis ....................................... .4-28
Hill and Mountain Roads ............................... .4-29
Winter Driving ............................................. .4-30
If Your Vehicle is Stuck in Sand, Mud, Ice,
or Snow .................................................. .4-33
Rocking Your Vehicle to Get It Out ................ .4-34
Recovery Hooks .......................................... .4-34
Loading Your Vehicle ................................... .4-35
Towing ......................................................... .4-41
Towing Your Vehicle .................................... .4-41
Recreational Vehicle Towing .......................... .4-42
Autoride ®
.................................................... .4-43
Towing a Trailer .......................................... .4-44
Trailer Recommendations .............................. .4-57Section 4 Driving Your Vehicle
4-1

Road Sensing Suspension The Road Sensing Suspension (RSS) feature provides
superior vehicle ride and handling under a variety of
passenger and loading conditions.
The system is fully automatic and uses a computer
controller to continuously monitor vehicle speed, wheel
to body position, lift/dive and steering position of the
vehicle. The controller then sends signals to each shock
absorber to independently adjust the damping level to
provide the optimum vehicle ride.
RSS also interacts with the tow/haul mode that, when
engaged, will provide additional control of the shock
absorbers. This additional control results in better ride
and handling characteristics when the vehicle is
loaded or towing a trailer. See “Tow/Haul Mode” under
Towing a Trailer on page 4-44 .
StabiliTrak ®
SystemYour vehicle may have 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. If these DIC messages appear, make
sure the StabiliTrak ®
system has not been turned
off using the StabiliTrak ®
on/off button. Then turn the
steering wheel clockwise from the nine o’clock position
to the three o’clock position. If this clears the
message(s), your vehicle does not need servicing. If this
does not clear the message(s), then turn the vehicle
off, wait 15 seconds, and then turn it back on again to
reset the system. If any of these messages still appear
on the Driver Information Center (DIC), your vehicle
should be taken in for service. For more information on
the DIC messages, see Driver Information Center (DIC)
on page 3-48 .
4-6

5.
Determine the combined weight of luggage
and cargo being loaded on the vehicle. That
weight may not safely exceed the available
cargo and luggage load capacity calculated
in Step 4.6.
If your vehicle will be towing a trailer, the load
from your trailer will be transferred to your
vehicle. Consult this manual to determine
how this reduces the available cargo
and luggage load capacity of your vehicle.
See Towing a Trailer on page 4-44 for
important information on towing a trailer,
towing safety rules and trailering tips.
Item Description Total
A Vehicle Capacity
Weight for
Example 1 = 1,000 lbs
(453 kg)
B Subtract Occupant
Weight 150 lbs
(68 kg) × 2 = 300 lbs (136 kg)
C Available Occupant
and Cargo Weight = 700 lbs (317 kg )Example 1
4-37

Automatic Level Control
The automatic level control rear suspension
comes as a part of the Road Sensing Suspension.
See Road Sensing Suspension on page 4-6 .
This type of level control is fully automatic and will
provide a better leveled riding position as well
as better handling under a variety of passenger
and loading conditions. An air compressor
connected to the rear shocks will raise or lower
the rear of the vehicle to maintain proper vehicle
height. The system is activated when the
ignition key is turned to RUN and will automatically
adjust vehicle height thereafter. The system
may exhaust (lower vehicle height) for up to
10 minutes after the ignition key has been turned
to LOCK. You may hear the air compressor
operating when the height is being adjusted. If a weight-distributing hitch is being used, it is
recommended to allow the shocks to in ate,
thereby leveling the vehicle prior to adjusting the
height. See “Weight distributing Hitches and
Weight Carrying Hitches” under Towing a Trailer
on page 4-44 .
Towing Towing Your Vehicle Consult your dealer/retailer or a professional towing
service if you need to have your disabled vehicle towed.
See Roadside Service on page 7-6 .
If you want to tow your vehicle behind another vehicle
for recreational purposes (such as behind a motorhome),
see Recreational Vehicle Towing following.
4-41

Recreational Vehicle Towing Recreational vehicle towing means towing your vehicle
behind another vehicle — such as behind a motorhome.
The two most common types of recreational vehicle
towing are known as “dinghy towing” (towing your vehicle
with all four wheels on the ground) and “dolly towing”
(towing your vehicle with two wheels on the ground and
two wheels up on a device known as a “dolly”).
With the proper preparation and equipment, many
vehicles can be towed in these ways. See “Dinghy
Towing” and “Dolly Towing”, following.
Here are some important things to consider before you
do recreational vehicle towing:
What’s the towing capacity of the towing vehicle?
Be sure you read the tow vehicle manufacturer’s
recommendations.
How far will you tow? Some vehicles have
restrictions on how far and how long they can tow.
Do you have the proper towing equipment?
See your dealer or trailering professional for
additional advice and equipment recommendations.
Is your vehicle ready to be towed? Just as you
would prepare your vehicle for a long trip, you’ll
want to make sure your vehicle is prepared to be
towed. See Before Leaving on a Long Trip on
page 4-28 . Dinghy Towing and Dolly Towing All-Wheel-Drive Vehicles Notice: Towing an all-wheel-drive vehicle with all
four wheels on the ground, or even with only two of
its wheels on the ground, will damage drivetrain
components. Do not tow an all-wheel-drive vehicle if
any of its wheels will be on the ground.
Your vehicle is not designed to be towed with any of the
wheels on the ground. If your vehicle must be towed,
see Towing Your Vehicle on page 4-41 .
Dinghy Towing Two-Wheel-Drive Vehicles Notice: If you tow a two-wheel-drive vehicle with all
four wheels on the ground, the transmission could be
damaged. The repairs would not be covered by your
warranty. Do not tow a two-wheel-drive vehicle with
all four wheels on the ground.
Two-wheel-drive vehicles should not be towed with all
four wheels on the ground. Two-wheel-drive
transmissions have no provisions for internal lubrication
while being towed.
4-42