2004 GMC ENVOY XL tow

If the warning light comes on, there could be a brake
problem. Have your brake system inspected right away.
This light should come on briey when you turn the
ignition key to RUN. If it doesn’t come on then, have it
xed so it will be ready to warn you if there’s a problem.
If the light comes on while you are driving, pull off the
road and stop carefully. You may notice that the pedal
is harder to push. Or, the pedal may go closer to
the oor. It may take longer to stop. If the light is still
on, have the vehicle towed for service. SeeTowing
Your Vehicle on page 4-45.
{CAUTION:
Your brake system may not be working
properly if the brake system warning light is
on. Driving with the brake system warning light
on can lead to an accident. If the light is still
on after you have pulled off the road and
stopped carefully, have the vehicle towed for
service. United States
Canada
3-41

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 does not come on, have
it repaired. This light will also come on during a
malfunction in one of two ways:
Light Flashing— A misre condition has been
detected. A misre increases vehicle emissions
and may damage the emission control system
on your vehicle. Diagnosis and service may
be required.
Light On Steady— 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 “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 your vehicle.
Turn the key 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
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. SeeFilling 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.
3-44

Change Engine Oil Light
When this light comes on, it means that service is
required for your vehicle. SeeScheduled Maintenance
on page 6-4andEngine Oil on page 5-16for more
information.
Once the engine oil has been changed, the change
engine 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 briey when you turn the key
toward START. The light will stay on until the engine
starts.
If the light ashes, the Passlock
®system has entered a
tamper mode. If the vehicle fails to start, seePasslock®
on page 2-19.
If the light comes on continuously while driving and
stays on, there may be a problem with the Passlock
®
system. Your vehicle will not be protected by Passlock®,
and you should see your dealer.
Also, seeContent Theft-Deterrent on page 2-17for
additional information regarding the SECURITY light. United States
CanadaUnited StatesCanada
3-47

Setting the Tone (Bass/Treble)
AUDIO:Push 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, 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. ALL will appear on
the display, you will hear a beep, and the display level
will be adjusted to the middle position.
AUTO EQ (Automatic Equalization):Press this button
to select customized equalization settings designed
for country/western, jazz, talk, pop, rock, and classical.
Selecting CUSTOM or changing bass or treble,
returns the EQ to the manual bass and treble settings.
The radio will save separate AUTO EQ settings for
each preset and source.
If the radio is equipped with the Bose audio system, the
equalization settings are either CUSTOM or TALK.
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. ALL will appear on
the display, you will hear a beep, and the display level
will be adjusted to the middle position.
3-68

Adjusting the Speakers (Balance/Fade)
AUDIO:To adjust the balance between 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 between 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. ALL will appear on
the display, you will hear a beep, and the display level
will be adjusted to the middle position.
Finding a Program Type (PTY) Station
(RDS and XM™)
To select and nd a desired PTY perform the following:
1. Turn the P-TYPE knob to activate program type
select mode. TYPE and a PTY will appear on the
display.
2. Turn the P-TYPE knob to select a PTY.
3. Once the desired PTY is displayed, press the
SEEK TYPE button or one of the SEEK arrows
to take you to the PTY’s rst station.
4. If you want to go to another station within that PTY
and the PTY is displayed, press the SEEK TYPE
button once. If the PTY is not displayed, press
the SEEK TYPE button twice to display the PTY and
then to go to another station.
5. Press the P-TYPE knob to exit program type
select mode.
If PTY times out and is no longer on the display,
go back to Step 1.
3-80

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 right or the left 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 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 controls are displayed. CENTERED will
appear on the display and you will hear a beep.
Finding a Program Type (PTY) Station
(RDS and XM™)
To select and nd a desired PTY perform the following:
1. Press the P-TYPE button to activate program
type select mode. P-TYPE and the last selected
PTY will appear on the display.
2. Turn the P-TYPE knob to select a PTY.
3. Once the desired PTY is displayed, press either
SEEK arrow to select the PTY and take you to
the PTY’s rst station.
4. To go to another station within that PTY and the
PTY is displayed, press either SEEK arrow once.
If the PTY is not displayed, press either SEEK arrow
twice to display the PTY and then to go to another
station.
5. Press the P-TYPE button to exit program type
select mode.
If PTY times out and is no longer on the display,
go back to Step 1.
If both P-TYPE and TRAF are on, the radio will
search for stations with the selected PTY and traffic
announcements.
3-95

Problem Recommended Action
After stopping the
player, I push Play but
sometimes the DVD
starts where I left off
and sometimes at the
beginning.If the stop button was
pressed one time, the
DVD player will resume
playing where the DVD
was stopped. If the stop
button was pressed two
times the DVD player will
begin to play from the
beginning of the DVD.
The auxiliary source is
running but there is no
picture or sound.Check that the DVD
player is in the auxiliary
source mode.
Check the auxiliary input
connections at both
devices.
My disc is stuck in the
player. The Load/Eject
button does not work.Turn the DVD power off,
then on, the press the
load/eject button on the
DVD player.
Do not attempt to forcibly
remove the disc from the
DVD player. This could
permanently damage the
disc and DVD player.Problem Recommended Action
Sometimes the wireless
headphone audio cuts
out or buzzes.Check for obstructions,
low batteries, reception
range, and interference
from cellular telephone
towers or by using your
cellular telephone in
the vehicle.
Check that the
headphones are facing
the front of the vehicle.
I lost the remote and/or
the headphones.See your dealer for
assistance.
The DVD is playing,
but there is no picture
or sound.Check that the DVD
player is in DVD mode.
The audio/video skips or
jumps.The DVD or CD could be
dirty, scratched, or
damaged.
The audio from the radio
for the Radio with
Six-Disc CD and XM™
has taken over the audio
from the DVD or CD when
using the wired
headphones.The RSE is working
correctly.
Use the wireless
headphones or have the
front seat passengers
listen to another audio
source.
3-116

Your Driving, the Road, and Your Vehicle..........4-2
Defensive Driving...........................................4-2
Drunken Driving.............................................4-2
Control of a Vehicle........................................4-6
Braking.........................................................4-6
Traction Assist System (TAS)...........................4-9
Locking Rear Axle........................................4-11
Steering......................................................4-11
Off-Road Recovery.......................................4-13
Passing.......................................................4-13
Loss of Control.............................................4-14
Off-Road Driving with Your Four-Wheel-Drive
Vehicle....................................................4-16
Driving at Night............................................4-30
Driving in Rain and on Wet Roads..................4-31City Driving..................................................4-34
Freeway Driving...........................................4-35
Before Leaving on a Long Trip.......................4-36
Highway Hypnosis........................................4-37
Hill and Mountain Roads................................4-38
Winter Driving..............................................4-40
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....................................4-49
Adding a Snow Plow or Similar Equipment.......4-55
Towing a Trailer...........................................4-55
Section 4 Driving Your Vehicle
4-1