2004 GMC ENVOY XUV towing

Trailer Wiring Harness
Your vehicle may be equipped with a seven-wire trailer
towing harness. This harness has a seven-pin
universal heavy-duty trailer connector that is attached to
a bracket on the hitch platform. The seven-wire
harness contains the following trailer circuits:
·Yellow: Left Stop/Turn Signal
·Dark Green: Right Stop/Turn Signal
·Brown: Running Lamps
·White: Ground
·Light Green: Back-up Lamps
·Red: Battery Feed
·Dark Blue: Electric Brakes
Your vehicle is also equipped with wiring for an electric
trailer brake controller. These wires are located
inside the vehicle on the driver's side under the
instrument panel. These wires should be connected to
an electric trailer brake controller by your dealer or
a quali®ed service center.
4-66

Automatic Transmission Fluid
When to Check and Change
A good time to check your automatic transmission ¯uid
level is when the engine oil is changed.
Change both the ¯uid and ®lter every 50,000 miles
(83 000 km) if the vehicle is mainly driven under one or
more of these conditions:
·In heavy city traffic where the outside temperature
regularly reaches 90ÉF (32ÉC) or higher.
·In hilly or mountainous terrain.
·When doing frequent trailer towing.
·Uses such as found in taxi, police or delivery
service.
If you do not use your vehicle under any of these
conditions, change the ¯uid and ®lter every
100,000 miles (166 000 km).
How to Check
Because this operation can be a little difficult, you may
choose to have this done at the dealership service
department.
If you do it yourself, be sure to follow all the instructions
here, or you could get a false reading on the dipstick.
Notice:Too much or too little ¯uid can damage
your transmission. Too much can mean that some
of the ¯uid could come out and fall on hot engine
part or exhaust system parts, starting a ®re.
Too little ¯uid could cause the transmission to
overheat. Be sure to get an accurate reading if you
check your transmission ¯uid.
Wait at least 30 minutes before checking the
transmission ¯uid level if you have been driving:
·When outside temperatures are above 90ÉF (32ÉC).
·At high speed for quite a while.
·In heavy traffic-especially in hot weather.
·While pulling a trailer.
To get the right reading, the ¯uid should be at normal
operating temperature, which is 180ÉF to 200ÉF
(82ÉC to 93ÉC).
Get the vehicle warmed up by driving about 15 miles
(24 km) when outside temperatures are above 50ÉF
(10ÉC). If it's colder than 50ÉF (10ÉC), drive the vehicle
in THIRD (3) until the engine temperature gage
moves and then remains steady for 10 minutes.
5-21

6. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine cooling fan.
7. By this time, the coolant level inside the radiator
®ller neck may be lower. If the level is lower, add
more of the proper DEX-COOL
žcoolant mixture
through the ®ller neck until the level reaches
the base of the ®ller neck.
8. Then replace the pressure cap. At any time during
this procedure if coolant begins to ¯ow out of the
®ller neck, reinstall the pressure cap. Be sure
the pressure cap is hand-tight.
Engine Fan Noise
This vehicle has a clutched engine cooling fan. When
the clutch is engaged, the fan spins faster to provide
more air to cool the engine. In most everyday driving
conditions the clutch is not engaged. This improves fuel
economy and reduces fan noise. Under heavy vehicle
loading, trailer towing, and/or high outside temperatures,
the fan speed increases when the clutch engages. So
you may hear an increase in fan noise. This is
normal and should not be mistaken as the transmission
slipping or making extra shifts. It is merely the cooling
system functioning properly. The fan will slow down
when additional cooling is not required and the clutch
disengages.
You may also hear this fan noise when you start the
engine. It will go away as the fan clutch disengages.
5-34

(h)Change automatic transmission ¯uid and ®lter if the
vehicle is mainly driven under one or more of these
conditions:
þIn heavy city traffic where the outside temperature
regularly reaches 90ÉF (32ÉC) or higher.
þIn hilly or mountainous terrain.
þWhen doing frequent trailer towing.
þUses such as found in taxi, police or delivery
service.
(i)Drain, ¯ush and re®ll cooling system. See Engine
Coolant on page 5-23for what to use. Inspect hoses.
Clean radiator, condenser, pressure cap and ®ller neck.
Pressure test the cooling system and pressure cap.
(j)
A ¯uid loss in any vehicle system could indicate a
problem. Have the system inspected and repaired and
the ¯uid level checked. Add ¯uid if needed.
Owner Checks and Services
These owner checks and services should be performed
at the intervals speci®ed to help ensure the safety,
dependability and emission control performance of your
vehicle. Your GM Goodwrench dealer can assist you
with these checks and services.
Be sure any necessary repairs are completed at once.
Whenever any ¯uids or lubricants are added to your
vehicle, make sure they are the proper ones, as shown
in
Recommended Fluids and Lubricants on page 6-13.
At Each Fuel Fill
It is important to perform these underhood checks at
each fuel ®ll.
6-9

Compass Calibration.......................................2-41
Compass Operation.........................................2-41
Compass Variance..........................................2-42
Content Theft-Deferrent....................................2-22
Control of a Vehicle.......................................... 4-5
Coolant
Engine Temperature Gage............................3-37
Heater, Engine............................................2-28
Cooling System..............................................5-28
Cruise Control................................................3-11
Cruise Control Light........................................3-43
CURB VIEW ACTIVATED.................................3-58
Current and Past Model Order Forms................7-12
Customer Assistance Information
Courtesy Transportation.................................. 7-7
Customer Assistance for Text Telephone (TTY)
Users....................................................... 7-4
Customer Assistance Offices........................... 7-4
Customer Satisfaction Procedure..................... 7-2
GM Mobility Program for Persons with
Disabilities................................................ 7-5
Reporting Safety Defects to General Motors....7-11
Reporting Safety Defects to the Canadian
Government............................................7-11
Reporting Safety Defects to the United
States Government...................................7-10
Roadside Assistance Program......................... 7-5
Service Publications Ordering Information........7-11D
Daytime Running Lamps (DRL).........................3-15
Defensive Driving............................................. 4-2
Defogging and Defrosting.........................3-21, 3-26
Delayed Locking............................................... 2-8
Dinghy Towing................................................4-46
Doing Your Own Service Work........................... 5-3
Dolly Towing..................................................4-48
Dome Lamp Override......................................3-17
Dome Lamps.................................................3-18
Door
Delayed Locking........................................... 2-8
Locks.......................................................... 2-7
Power Door Locks......................................... 2-8
Programmable Automatic Door Locks............... 2-9
Rear Door Security Locks.............................2-11
Driver
Position, Safety Belt.....................................1-13
DRIVER DOOR AJAR.....................................3-57
Driver Information Center (DIC).........................3-46
DIC Operation and Displays..........................3-46
DIC Warnings and Messages........................3-56
Driving
At Night.....................................................4-28
City...........................................................4-33
Defensive..................................................... 4-2
Drunken....................................................... 4-2
4

Loss of Control...............................................4-14
Low Fuel Warning Light...................................3-45
Lumbar
Power Controls............................................. 1-3
MMaintenance Schedule
Additional Required Services........................... 6-6
At Each Fuel Fill........................................... 6-9
At Least Once a Month................................6-10
At Least Once a Year..................................6-11
Introduction.................................................. 6-2
Maintenance Footnotes.................................. 6-8
Maintenance Record....................................6-17
Maintenance Requirements............................. 6-2
Normal Maintenance Replacement Parts.........6-15
Owner Checks and Services........................... 6-9
Recommended Fluids and Lubricants.............6-13
Scheduled Maintenance................................. 6-4
Using Your................................................... 6-3
Your Vehicle and the Environment................... 6-2
Maintenance When Trailer Towing.....................4-65
Making Turns.................................................4-63
Malfunction Indicator Light................................3-38
Manual Seats................................................... 1-2
Matching Transmitter(s) to Your Vehicle............... 2-5
Memory Seat.................................................2-54Message
DIC Warnings and Messages........................3-56
Mexico, Central America and Caribbean Islands/
Countries (Except Puerto Rico and U.S. Virgin
Islands)....................................................... 7-5
Midgate.........................................................2-12
Mirror Operation.............................................2-41
Mirrors
Automatic Dimming Rearview with OnStarž
and Compass..........................................2-41
Outside Automatic Dimming Mirror with Curb
View Assist.............................................2-44
Outside Convex Mirror.................................2-44
Outside Heated Mirrors................................2-44
Outside Manual Mirrors................................2-43
Outside Power Mirrors..................................2-43
MyGMLink.com................................................ 7-3
N
Navigation/Radio System................................3-104
New Vehicle Break-In......................................2-24
Normal Maintenance Replacement Parts............6-15
O
Odometer......................................................3-32
Off-Road Recovery..........................................4-12
9

Power (cont.)
Roof..........................................................2-17
Seat............................................................ 1-3
Steering Fluid.............................................5-35
Windows....................................................2-20
Power Steering...............................................4-10
Programmable Automatic Door Locks.................. 2-9
Programmable Locking Feature.......................... 2-9
Programmable Unlocking Feature......................2-10
Programming the HomeLink
žTransmitter...........2-47
Q
Questions and Answers About Safety Belts.........1-12
R
Radiator Pressure Cap....................................5-26
Radio Data System (RDS)...............3-62, 3-74, 3-89
Radio Messages.....................................3-68, 3-80
Radios..........................................................3-61
Care of Your Cassette Tape Player...............3-119
Care of Your CD and DVD Player................3-121
Care of Your CDs and DVDs.......................3-120
Navigation/Radio System.............................3-104
Radio Personalization.................................3-117
Radio with Cassette and CD.........................3-74
Radio with CD............................................3-62
Radio with Six-Disc CD................................3-89Radios (cont.)
Rear Seat Audio........................................3-116
Setting the Time..........................................3-61
Theft-Deterrent..........................................3-117
Understanding Reception............................3-119
RainsenseŸ Wipers.......................................... 3-9
RDS Messages..............................3-67, 3-79, 3-95
Reading Lamps..............................................3-18
Rear Axle......................................................5-46
Locking......................................................4-10
Rear Cargo Mat.............................................2-53
Rear Climate Control System............................3-28
Rear Door Security Locks................................2-11
Rear Safety Belt Comfort Guides......................1-24
Rear Seat Audio (RSA)..................................3-116
Rear Seat Entertainment System.....................3-104
Rear Seat Operation......................................... 1-7
Rear Seat Passenger Positions.........................1-21
Rear Seat Passengers, Safety Belts..................1-21
Rear Underseat Fuse Block..............................5-98
Rear Window Defogger............................3-22, 3-26
REAR WIPER OBSTRUCTION.........................3-60
Rearview Mirror, Automatic Dimming with
OnStar
žand Compass.................................2-41
Reclining Seatbacks.......................................... 1-5
Recommended Fluids and Lubricants.................6-13
Recreational Vehicle Towing.............................4-45
Reduced Engine Power Light............................3-43
Remote Control.............................................3-108
Remote Keyless Entry System............................ 2-4
11

Sun Visors.....................................................2-21
Sunroof.........................................................2-54
T
Tachometer....................................................3-33
Tailgate.........................................................2-13
TAILGATE AJAR.............................................3-60
TAILGATE GLASS DOWN................................3-60
TAILGATE OPEN............................................3-60
Taillamps
Turn Signal Lamps......................................5-49
Testing the Alarm............................................2-23
Theft-Deterrent, Radio....................................3-117
Theft-Deterrent Systems...................................2-22
Content Theft-Deterrent................................2-22
Passlock
ž...................................................2-23
Throttle, Adjustable..........................................2-27
TIGHTEN FUEL CAP......................................3-60
Tilt Wheel........................................................ 3-6
Tire Sidewall Labeling......................................5-52
Tire Size.......................................................5-56
Tire Terminology and De®nitions........................5-57
Tires.............................................................5-52
Buying New Tires........................................5-64
Chains.......................................................5-68
Changing a Flat Tire....................................5-71
If a Tire Goes Flat.......................................5-70
In¯ation - Tire Pressure................................5-60Tires (cont.)
Inspection and Rotation................................5-61
Spare Tire..................................................5-83
Uniform Tire Quality Grading.........................5-65
Wheel Alignment and Tire Balance.................5-66
Wheel Replacement.....................................5-66
When It Is Time for New Tires......................5-63
To Use the Engine Coolant Heater....................2-28
Top Strap......................................................1-38
Top Strap Anchor Location...............................1-40
Torque Lock...................................................2-37
Total Weight on Your Vehicle's Tires..................4-60
Towing
Recreational Vehicle.....................................4-45
Towing a Trailer..........................................4-56
Your Vehicle...............................................4-45
Traction
Assist System (TAS)...................................... 4-8
Trailer Brakes.................................................4-61
Trailer Wiring Harness.....................................4-66
Transfer Case................................................5-46
Transmission
Fluid, Automatic...........................................5-21
Transmission Operation, Automatic....................2-29
Transmission, Transaxle, Transfer Case Unit
Repair Manual............................................7-11
Transportation Options...................................... 7-8
Traveling to Remote Areas...............................4-17
Trip Information..............................................3-47
Trip Odometer................................................3-32
14