2009 GMC ENVOY Owner's Manual

Cleaning the Video Screen
Use isopropyl or rubbing alcohol on a clean cloth and
gently wipe the video screen. Do not spray directly onto
the screen and do not press too hard or too long on
the video screen.
Rear Seat Audio (RSA)
This feature allows rear seat passengers to listen to any
of the sources: radio, CDs, or DVDs. However, the
rear seat passengers can only control the sources that
are not being listened by the front seat passengers.
For example, rear seat passengers can listen to
and control CDs or DVDs through the headphones
while the driver listens to the radio through the front
speakers. The rear seat passengers have control of the
volume for each set of headphones.
The front seat audio controls always have priority over
the RSA controls. If the front seat passengers switch
the source for the main radio to a remote source,
the RSA is not able to control the source. The rear seat
audio can be operated while the main radio is off.
P(Power):Press to turn the system on or off.
The rear speakers are muted when the power is
turned on.
u(Volume):Turn to increase or to decrease the
volume. The left volume knob controls the left wired
headphones and the right volume knob controls the
right wired headphones.
SRCE (Source):Press to select a source: radio, CD,
or DVD. The inactive CD or DVD remains inside
the radio for future listening.
SEEK:Press to advance to the next station or track
and stay there. The display shows the selection.
This function is inactive if the front seat passengers are
listening to the same audio source.
3-109

To scan preset stations, press and hold the SEEK
button for two seconds and the radio advances to the
next preset station. If the button continues to be
held down, the radio advances through the available
preset stations. The display shows the selections.
This function is inactive if the front seat passengers are
listing to the radio.
While a CD is playing, press the SEEK button to go to
the next track on the CD. This function is inactive if
the front seat passengers are listening to a CD.
While a CD is playing in the six-disc CD player, press
and hold the SEEK button for two seconds to go to
the next CD, if multiple CDs are loaded. This function
is inactive if the front seat passengers are listening
to a CD.
Theft-Deterrent Feature
THEFTLOCK®is designed to discourage theft of the
vehicle’s radio by learning a portion of the Vehicle
Identication Number (VIN). The radio does not operate
and LOCKED displays if the radio is stolen or moved
to a different vehicle.
When the when the ignition is in the off position, a
blinking red light on the upper left side of the radio
indicates that THEFTLOCK
®is armed.
Audio Steering Wheel Controls
Vehicles with audio steering wheel controls could differ
depending on the vehicle’s options. Some audio
controls can be adjusted at the steering wheel.
g(Mute/ Voice Recognition):For vehicles with
OnStar®or Bluetooth®systems pressgto interact with
those systems. SeeOnStar®System on page 2-43
andBluetooth®on page 3-86in this manual for more
information.
If the vehicle does not have OnStar, press
gto silence
the vehicle speakers only. Press
gagain, or any other
radio button, to turn on the sound.
3-110

PROG (Program):Press to play a station that has
been programmed on the radio preset pushbuttons.
The radio seeks preset stations only with a strong signal
that are in the selected band.
When a CD is playing in the CD changer, press this
button to go to the next available CD, if multiple CDs
are loaded.
QSOURCER:Press the SOURCE arrows to switch
between FM1, FM2, AM, or XM1 or XM2, or a CD.
If a CD is loaded the CD symbol displays.
QSEEKR:Press the SEEK arrows to go to the
previous or the next radio station and stay there.
The radio seeks stations only with a strong signal that
are in the selected band.
When a CD is playing, press the SEEK arrows to fast
forward or reverse.
QVOLR(Volume):Press the VOL arrows to increase
or to decrease the volume.
Radio Reception
Frequency interference and static can occur during
normal radio reception if items such as cell phone
chargers, vehicle convenience accessories, and external
electronic devices are plugged into the accessory power
outlet. If there is interference or static, unplug the item
from the accessory power outlet.
AM
The range for most AM stations is greater than for
FM, especially at night. The longer range can cause
station frequencies to interfere with each other.
For better radio reception, most AM radio stations boost
the power levels during the day, and then reduce
these levels during the night. Static can also occur when
things like storms and power lines interfere with radio
reception. When this happens, try reducing the treble on
the radio.
FM Stereo
FM signals only reach about 10 to 40 miles (16 to 65 km).
Although the radio has a built-in electronic circuit that
automatically works to reduce interference, some static
can occur, especially around tall buildings or hills,
causing the sound to fade in and out.
3-111

XM™ Satellite Radio Service
XM Satellite Radio Service gives digital radio reception
from coast-to-coast in the 48 contiguous United States,
and in Canada. Just as with FM, tall buildings or hills can
interfere with satellite radio signals, causing the sound to
fade in and out. In addition, traveling or standing under
heavy foliage, bridges, garages, or tunnels may cause
loss of the XM signal for a period of time.
Cellular Phone Usage
Cellular phone usage may cause interference with the
vehicle’s radio. This interference may occur when
making or receiving phone calls, charging the phone’s
battery, or simply having the phone on. This interference
causes an increased level of static while listening to
the radio. If static is received while listening to the radio,
unplug the cellular phone and turn it off.
Fixed Mast Antenna
The xed mast antenna can withstand most car washes
without being damaged as long as it is securely
attached to the base. If the mast becomes slightly bent,
straighten it out by hand. If the mast is badly bent,
replace it.
Occasionally check to make sure the antenna is
tightened to its base. If tightening is required, tighten by
hand until fully seated plus one quarter turn.
XM™ Satellite Radio Antenna
System
The XM Satellite Radio antenna is located on the roof of
the vehicle. Keep the antenna clear of obstructions for
clear radio reception.
If the vehicle has a sunroof, the performance of the
XM system may be affected if the sunroof is open.
Chime Level Adjustment
The radio is used to adjust the vehicle’s chime level.
To change the volume level of the chime, press and hold
pushbutton 6 with the ignition on and the radio power
off. The volume level will change from the normal
level to loud, and LOUD CHIME will appear on the radio
display. To change back to the default or normal
setting, press and hold pushbutton 6 again. The volume
level will change from the loud level to normal, and
NORMAL CHIME will appear on the radio display.
Removing the radio and not replacing it with a factory
radio or chime module will disable vehicle chimes.
3-112

Your Driving, the Road, and the Vehicle............4-2
Driving for Better Fuel Economy.......................4-2
Defensive Driving...........................................4-2
Drunk Driving.................................................4-3
Control of a Vehicle........................................4-3
Braking.........................................................4-4
Antilock Brake System (ABS)...........................4-5
Braking in Emergencies...................................4-6
StabiliTrak
®System........................................4-6
Locking Rear Axle........................................4-10
Steering......................................................4-10
Off-Road Recovery.......................................4-12
Passing.......................................................4-12
Loss of Control.............................................4-12
Off-Road Driving...........................................4-13
Driving at Night............................................4-25Driving in Rain and on Wet Roads..................4-25
Before Leaving on a Long Trip.......................4-26
Highway Hypnosis........................................4-26
Hill and Mountain Roads................................4-27
Winter Driving..............................................4-28
If Your Vehicle is Stuck in Sand, Mud,
Ice, or Snow.............................................4-30
Rocking Your Vehicle to Get It Out.................4-31
Loading the Vehicle......................................4-31
Adding a Snow Plow or Similar Equipment.......4-38
Towing..........................................................4-38
Towing Your Vehicle.....................................4-38
Recreational Vehicle Towing...........................4-38
Electronically Controlled Air Suspension
System....................................................4-45
Towing a Trailer...........................................4-46
Section 4 Driving Your Vehicle
4-1

Your Driving, the Road, and
the Vehicle
Driving for Better Fuel Economy
Driving habits can affect fuel mileage. Here are some
driving tips to get the best fuel economy possible.
Avoid fast starts and accelerate smoothly.
Brake gradually and avoid abrupt stops.
Avoid idling the engine for long periods of time.
When road and weather conditions are appropriate,
use cruise control, if equipped.
Always follow posted speed limits or drive more
slowly when conditions require.
Keep vehicle tires properly inated.
Combine several trips into a single trip.
Replace the vehicle’s tires with the same TPC Spec
number molded into the tire’s sidewall near the size.
Follow recommended scheduled maintenance.
Defensive Driving
Defensive driving means “always expect the
unexpected.” The rst step in driving defensively is to
wear your safety belt — SeeSafety Belts: They Are for
Everyone on page 1-13.
{CAUTION:
Assume that other road users (pedestrians,
bicyclists, and other drivers) are going to be
careless and make mistakes. Anticipate what they
might do and be ready. In addition:
Allow enough following distance between you
and the driver in front of you.
Focus on the task of driving.
Driver distraction can cause collisions resulting in
injury or possible death. These simple defensive
driving techniques could save your life.
4-2

Drunk Driving
{CAUTION:
Drinking and then driving is very dangerous. Your
reexes, perceptions, attentiveness, and judgment
can be affected by even a small amount of alcohol.
You can have a serious — or even fatal — collision
if you drive after drinking. Do not drink and drive or
ride with a driver who has been drinking. Ride home
in a cab; or if you are with a group, designate a
driver who will not drink.
Death and injury associated with drinking and driving is
a global tragedy.
Alcohol affects four things that anyone needs to drive a
vehicle: judgment, muscular coordination, vision, and
attentiveness.
Police records show that almost 40 percent of all motor
vehicle-related deaths involve alcohol. In most cases,
these deaths are the result of someone who was drinking
and driving. In recent years, more than 17,000 annual
motor vehicle-related deaths have been associated with
the use of alcohol, with about 250,000 people injured.For persons under 21, it is against the law in every
U.S. state to drink alcohol. There are good medical,
psychological, and developmental reasons for
these laws.
The obvious way to eliminate the leading highway
safety problem is for people never to drink alcohol and
then drive.
Medical research shows that alcohol in a person’s
system can make crash injuries worse, especially
injuries to the brain, spinal cord, or heart. This means
that when anyone who has been drinking — driver
or passenger — is in a crash, that person’s chance of
being killed or permanently disabled is higher than if the
person had not been drinking.
Control of a Vehicle
The following three systems help to control the vehicle
while driving — brakes, steering, and accelerator. At
times, as when driving on snow or ice, it is easy to ask
more of those control systems than the tires and road can
provide. Meaning, you can lose control of the vehicle.
Adding non-dealer/non-retailer accessories can affect
vehicle performance. SeeAccessories and Modifications
on page 5-3.
4-3

Braking
SeeBrake System Warning Light on page 3-35.
Braking action involves perception time and reaction
time. Deciding to push the brake pedal is perception
time. Actually doing it is reaction time.
Average reaction time is about three-fourths of
a second. But that is only an average. It might be less
with one driver and as long as two or three seconds
or more with another. Age, physical condition, alertness,
coordination, and eyesight all play a part. So do
alcohol, drugs, and frustration. But even in three-fourths
of a second, a vehicle moving at 60 mph (100 km/h)
travels 66 feet (20 m). That could be a lot of distance in
an emergency, so keeping enough space between
the vehicle and others is important.
And, of course, actual stopping distances vary greatly
with the surface of the road, whether it is pavement or
gravel; the condition of the road, whether it is wet, dry, or
icy; tire tread; the condition of the brakes; the weight of
the vehicle; and the amount of brake force applied.Avoid needless heavy braking. Some people drive
in spurts — heavy acceleration followed by heavy
braking — rather than keeping pace with traffic. This is a
mistake. The brakes might not have time to cool between
hard stops. The brakes will wear out much faster with a
lot of heavy braking. Keeping pace with the traffic and
allowing realistic following distances eliminates a lot of
unnecessary braking. That means better braking and
longer brake life.
If the engine ever stops while the vehicle is being driven,
brake normally but do not pump the brakes. If the brakes
are pumped, the pedal could get harder to push down.
If the engine stops, there will still be some power brake
assist but it will be used when the brake is applied. Once
the power assist is used up, it can take longer to stop and
the brake pedal will be harder to push.
Adding non-dealer/non-retailer accessories can affect
vehicle performance. SeeAccessories and Modifications
on page 5-3.
4-4