2003 GMC ENVOY tow

This light should come on, as a check to show you it is
working, when the ignition is on and the engine is
not running. If the light doesn't come on, have it
repaired. This light will also come on during a
malfunction in one of two ways:
·Light FlashingÐ A mis®re condition has been
detected. A mis®re increases vehicle emissions
and may damage the emission control system on
your vehicle. Diagnosis and service may be
required.
·Light On SteadyÐ An emission control system
malfunction has been detected on your vehicle.
Diagnosis and service may be required.
If the Light Is Flashing
The following may prevent more serious damage to
your vehicle:
·Reducing vehicle speed.
·Avoiding hard accelerations.
·Avoiding 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 ªIf
the Light Is On Steadyº following.
If the light continues to ¯ash, when it is safe to do so,
stop the vehicle.Find a safe place to park your vehicle.
Turn the key off, wait at least 10 seconds and restart
the engine. If the light remains on steady, see ªIf
the Light Is On Steadyº following. If the light is still
¯ashing, follow the previous steps, and see your dealer
for service as soon as possible.
If the Light Is On Steady
You may 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 Your 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 will allow 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 electrical system may be wet. The condition
will usually be corrected when the electrical system
dries out. A few driving trips should turn the light off.
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Change Engine Oil Light
This light is displayed when the engine oil needs to be
changed.
Once the engine oil has been changed, the CHANGE
ENG OIL light must be reset. Until it is reset, the light will
be displayed when the engine is on.
Security Light
This light will come on brie¯y when you turn the key
toward START. The light will stay on until the engine
starts.
If the light ¯ashes, the Passlock
žsystem has entered a
tamper mode. If the vehicle fails to start, seePasslockž
on page 2-18.
If the light comes on continuously while driving and
stays on, there may be a problem with the Passlock
ž
system. Your vehicle will not be protected by Passlockž,
and you should see your dealer.
Also, see
Content Theft-Deterrent on page 2-17for
additional information regarding the SECURITY light. United States
CanadaUnited StatesCanada
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Setting the Tone (Bass/Treble)
AUDIO:Press and release the AUDIO knob until BASS
or TREB appears on the display. Turn the knob to
increase or to decrease. The display will show the bass
or treble level. If a station is weak or noisy, you may
want to decrease the treble.
To adjust the bass and treble to the middle position,
push and hold the AUDIO knob. The radio will produce
one beep and adjust the display level to the middle
position.
To adjust all tone and speaker controls to the middle
position, push and hold the AUDIO knob when no tone
or speaker control is displayed. The radio will produce
one beep and display ALL with the level display in
the middle position.
AUTO TONE (Automatic Tone):Press this button to
choose bass and treble equalization settings designed
for country/western, jazz, talk, pop, rock and classical
stations.
To return the bass and treble to the manual mode,
press and release the AUDIO knob.
Adjusting the Speakers (Balance/Fade)
AUDIO:To adjust the balance to the right and the
left speakers, push and release the AUDIO knob until
BAL appears on the display. Turn the knob to move the
sound toward the right or the left speakers.
To adjust the fade to the front and the rear speakers,
push and release the AUDIO knob until FADE appears
on the display. Turn the knob to move the sound
toward the front or the rear speakers.
To adjust the balance and fade to the middle position,
push the AUDIO knob then push it again and hold it until
the radio produces one beep. The balance and fade
will be adjusted to the middle position and the display
will show the speaker balance.
To adjust all tone and speaker controls to the middle
position, push and hold the AUDIO knob when no tone
or speaker control is displayed. The radio will produce
one beep and display ALL with the level display in
the middle position.
3-66

Adjusting the Speakers (Balance/Fade)
AUDIO:To adjust the balance to the right and the
left speakers, push and release the AUDIO knob until
BAL appears on the display. Turn the knob to move the
sound toward the right or the left speakers.
To adjust the fade to the front and the rear speakers,
push and release the AUDIO knob until FADE appears
on the display. Turn the knob to move the sound
toward the front or the rear speakers.
To adjust the balance and fade to the middle position,
push the AUDIO knob then push it again and hold it until
the radio produces one beep. The balance and fade
will be adjusted to the middle position and the display
will show the speaker balance.
To adjust all tone and speaker controls to the middle
position, push and hold the AUDIO knob when no tone
or speaker control is displayed. The radio will produce
one beep and display ALL with the level display in
the middle position.
Using RDS
Your audio system is equipped with a Radio Data
System (RDS). RDS features are available for use only
on FM stations that broadcast RDS information.
Using this system, the radio can do the following:
·Seek to stations broadcasting the selected type of
programming,
·receive announcements concerning local and
national emergencies,
·display messages from radio stations, and
·seek to stations with traffic announcements.
This system relies upon receiving speci®c information
from these stations and will only work when the
information is available. In rare cases, a radio station
may broadcast incorrect information that will cause
the radio features to work improperly. If this happens,
contact the radio station.
While you are tuned to an RDS station, the station
name or the call letters will appear on the display,
instead of the frequency. RDS stations may also provide
the time of day, a program type (PTY) for current
programming and the name of the program being
broadcast.
3-74

Setting the Tone (Bass/Treble)
AUDIO:Push the AUDIO knob until BASS, MID or
TREB appears on the display. Turn the knob to increase
or to decrease. If a station is weak or noisy, you may
want to decrease the treble.
To adjust bass, midrange or treble to the middle
position, select BASS, MID or TREB and push and hold
the AUDIO knob. The radio will produce one beep
and adjust the display level to zero.
To adjust all tone and speaker controls to the middle
position, push and hold the AUDIO knob when no tone
or speaker control is displayed. The radio will produce
one beep and CENTERED will appear on the display.
AUTO EQ (Automatic Equalization):Press this button
to choose between bass and treble equalization
settings designed for country, jazz, talk, pop, rock and
classical program types.
To return to the manual mode, press the AUTO EQ
button until CUSTOM appears on the display or adjust
the bass and treble. Then you will be able to manually
adjust the bass and treble using the AUDIO knob.
The radio will save separate AUTO EQ settings for each
preset and source.
If your vehicle has the Bose
žaudio system, your AUTO
EQ settings are either CUSTOM or TALK.
Adjusting the Speakers (Balance/Fade)
AUDIO:To adjust the balance between the right
and the left speakers, push the AUDIO knob until BAL
appears on the display. Turn the knob to move the
sound toward the left or the right speakers.
To adjust the fade between the front and rear speakers,
push and hold the AUDIO knob until FAD appears on
the display. Turn the knob to move the sound toward the
front or the rear speakers.
To adjust the balance and the fade to the middle
position, select balance or fade and push and hold the
AUDIO knob. The radio will beep once and will
adjust the display level to the middle position.
To adjust all tone and speaker controls to the middle
position, push and hold the AUDIO knob when no tone
or speaker controls are displayed. The radio will
produce one beep and CENTERED will appear on the
display.
3-83

Problem Recommended Action
The DVD is playing but
there is no picture or
sound.
The auxiliary medium
(video game, camcorder,
etc.) is running but there
is no picture or sound.Press the INPUT/TITLE
button on the remote to
get to auxiliary input.
The auxiliary medium's
cords could be plugged
into the wrong jack.
The audio or video skips
or jumps.The DVD could be dirty
or scratched. Try cleaning
the DVD.
When I return to the DVD
from the system menu,
sometimes it plays from
the beginning and
sometimes from where it
left off.If the STOP button was
pressed once, it resumes
play from where it left off.
If the STOP button was
pressed twice, it will start
at the beginning of the
DVD.
However, if a change was
made to the menu, the
DVD will start from the
beginning, even if the
STOP button was only
pressed once.
The fast forward, fast
reverse, previous and
next functions do not
work.Some commands that do
one thing for DVDs will
not always work or
perform the same
function for audio, CDs or
games.Problem Recommended Action
My disc is stuck in the
player. The EJECT/LOAD
button does not work.Press the EJECT/LOAD
button on the remote, or
the STOP/EJECT button
on the DVD player.
Turn the power off, then
on again.
Do not attempt to forcibly
remove the disc from the
player.
I lost the remote and/or
the headphones.See your dealer for
assistance.
What is the best way to
clean the screen?Pour some isopropyl or
rubbing alcohol on a
clean cloth and wipe.
Sometimes the wireless
headphone audio cuts
out or buzzes for a
moment then it comes
back.This could be caused by
interference from cell
towers or by using your
cell phone in the vehicle.
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Your Driving, the Road, and Your Vehicle..........4-2
Defensive Driving...........................................4-2
Drunken Driving.............................................4-2
Control of a Vehicle........................................4-5
Braking.........................................................4-5
Traction Assist System (TAS)...........................4-8
Locking Rear Axle........................................4-10
Steering......................................................4-10
Off-Road Recovery.......................................4-12
Passing.......................................................4-12
Loss of Control.............................................4-14
Off-Road Driving with Your Four-Wheel-Drive
Vehicle....................................................4-15
Driving at Night............................................4-28
Driving in Rain and on Wet Roads..................4-30City Driving..................................................4-33
Freeway Driving...........................................4-34
Before Leaving on a Long Trip.......................4-35
Highway Hypnosis........................................4-36
Hill and Mountain Roads................................4-37
Winter Driving..............................................4-39
If You Are Stuck: In Sand, Mud,
Ice or Snow..............................................4-44
Towing..........................................................4-45
Towing Your Vehicle.....................................4-45
Recreational Vehicle Towing...........................4-45
Loading Your Vehicle....................................4-47
Adding a Snow Plow or Similar Equipment.......4-50
Towing a Trailer...........................................4-50
Section 4 Driving Your Vehicle
4-1

If You Are Stuck: In Sand, Mud,
Ice or Snow
In order to free your vehicle when it is stuck, you will
need to spin the wheels, but you don't want to spin your
wheels too fast. The method known as ªrockingº can
help you get out when you're stuck, but you must
use caution.
{CAUTION:
If you let your tires spin at high speed, they
can explode, and you or others could be
injured. And, the transmission or other parts of
the vehicle can overheat. That could cause an
engine compartment ®re or other damage.
When you're stuck, spin the wheels as little as
possible. Don't spin the wheels above 35 mph
(55 km/h) as shown on the speedometer.
Notice:Spinning your wheels can destroy parts of
your vehicle as well as the tires. If you spin the
wheels too fast while shifting your transmission
back and forth, you can destroy your transmission.
For information about using tire chains on your
vehicle, see
Tire Chains on page 5-62.
Rocking Your Vehicle To Get It Out
First, turn your steering wheel left and right. That will
clear the area around your front wheels. If you have a
four- wheel-drive vehicle, shift into 4HI. Then shift
back and forth between REVERSE (R) and a forward
gear, spinning the wheels as little as possible. Release
the accelerator pedal while you shift, and press lightly
on the accelerator pedal when the transmission is
in gear. By slowly spinning your wheels in the forward
and reverse directions, you will cause a rocking
motion that may free your vehicle. If that doesn't get
you out after a few tries, you may need to be towed out.
If you do need to be towed out, see
Towing Your
Vehicle on page 4-45.
4-44