2003 GMC ENVOY headlamp

If you need to replace any of your wheels, wheel bolts
or wheel nuts, replace them only with new GM
original equipment parts. This way, you will be sure to
have the right wheel, wheel bolts and wheel nuts
for your vehicle.
{CAUTION:
Using the wrong replacement wheels, wheel
bolts or wheel nuts on your vehicle can be
dangerous. It could affect the braking and
handling of your vehicle, make your tires lose
air and make you lose control. You could have
a collision in which you or others could be
injured. Always use the correct wheel, wheel
bolts and wheel nuts for replacement.
Notice:The wrong wheel can also cause problems
with bearing life, brake cooling, speedometer or
odometer calibration, headlamp aim, bumper height,
vehicle ground clearance and tire or tire chain
clearance to the body and chassis.
See
Changing a Flat Tire on page 5-64for more
information.
Used Replacement Wheels
{CAUTION:
Putting a used wheel on your vehicle is
dangerous. You can't know how it's been used
or how far it's been driven. It could fail
suddenly and cause a crash. If you have to
replace a wheel, use a new GM original
equipment wheel.
5-61

Electrical System
Add-On Electrical Equipment
Notice:Don't add anything electrical to your
vehicle unless you check with your dealer ®rst.
Some electrical equipment can damage your vehicle
and the damage wouldn't be covered by your
warranty. Some add-on electrical equipment can
keep other components from working as they
should.
Your vehicle has an air bag system. Before attempting
to add anything electrical to your vehicle, see
Servicing Your Air Bag-Equipped Vehicle on page 1-60.
Headlamps
The headlamp wiring is protected by four fuses. An
electrical overload will cause a lamp to go on and off. If
this happens, have your headlamp wiring checked
right away.
Windshield Wiper Fuses
The windshield wiper motor is protected by a circuit
breaker and a fuse. If the motor overheats due to heavy
snow or ice, the wiper will stop until the motor cools.
If the overload is caused by some electrical problem, be
sure to get it ®xed.
5-89

Fuses Usage
1Electrically-Controlled Air
Suspension
2Passenger's Side High-Beam
Headlamp
3Passenger's Side Low-Beam
Headlamp
4 Back-Up-Trailer Lamps
5 Driver's Side High-Beam Headlamp
6 Driver's Side Low-Beam Headlamp
7 Wash
8 Automatic Transfer Case
9 Windshield Wipers
10 Powertrain Control Module B
11 Fog Lamps
12 Stop Lamp
13 Cigarette Lighter
14 Ignition Coils
15 Air Suspension Ride
16 TBD-Ignition 1Fuses Usage
17 Crank
18 Air Bag
19 Electric Brake
20 Cooling Fan
21 Horn
22 Ignition E
23 Electronic Throttle Control
24Instrument Panel Cluster, Driver
Information Center
25 Automatic Shift Lock Control System
26 Engine 1
27 Back-Up
28 Powertrain Control Module 1
29 Oxygen Sensor
30 Air Conditioning
31 Truck Body Controller
32 Trailer
33 Anti-Lock Brakes (ABS)
5-93

Fuses Usage
34 Ignition A
35 Blower Motor
36 Ignition B
50 Passenger's Side Trailer Turn
51 Driver's Side Trailer Turn
52 Hazard Flashers
Relays Usage
37 Blank
38 Rear Window Washer
39 Fog Lamps
40 HornFuses Usage
41 Fuel Pump
42 Windshield Wipers/Washer
43 High-Beam Headlamp
44 Air Conditioning
45 Cooling Fan
46 Headlamp Driver Module
47 Starter
Miscellaneous Usage
48 Instrument Panel Battery
49 Blank
5-94

Fuses Usage
1Electrically-Controlled Air
Suspension
2Passenger's Side High-Beam
Headlamp
3Passenger's Side Low-Beam
Headlamp
4 Back-Up-Trailer Lamps
5 Driver's Side High-Beam Headlamp
6 Driver's Side Low-Beam Headlamp
7 Wash
8 Automatic Transfer Case
9 Windshield Wipers
10 Powertrain Control Module B
11 Fog Lamps
12 Stop Lamp
13 Cigarette Lighter
14 Ignition Coils
15 Cannister Vent
16 TBD-Ignition 1
17 Crank
18 Air Bag
19 Electric Brake
20 Cooling Fan
21 HornFuses Usage
22 Ignition E
23 Electronic Throttle Control
24Instrument Panel Cluster, Driver
Information Center
25 Automatic Shift Lock Control System
26 Engine 1
27 Back-Up
28 Powertrain Control Module 1
30 Air Conditioning
31 Truck Body Controller 1
32 Trailer
33 Anti-Lock Brakes (ABS)
34 Ignition A
35 Blower Motor
36 Ignition B
50 Passenger's Side Trailer Turn
51 Driver's Side Trailer Turn
52 Hazard Flashers
53 Oxygen Sensor Bank A
54 Oxygen Sensor Bank B
55 Injector Bank A
56 Injector Bank B
Relays Usage
37 Headlamp Washer
5-96

Fuses Usage
38 Rear Window Washer
39 Fog Lamps
40 Horn
41 Fuel Pump
42 Windshield Wipers/Washer
43 High-Beam Headlamp
44 Air Conditioning
45 Cooling Fan
46 Headlamp Driver Module
47 Starter
58 Ignition 1
Miscellaneous Usage
48 Instrument Panel BatteryRear Underseat Fuse Block
L6 Engine
5-97

A
Accessory In¯ator...........................................5-62
Accessory Power Outlets.................................3-19
Adding a Snow Plow or Similar Equipment.........4-50
Adding Washer Fluid.......................................5-37
Additional Program Information........................... 7-8
Additives, Fuel................................................. 5-6
Add-On Electrical Equipment............................5-89
Adjusting the Speakers
(Balance/Fade)............................3-66, 3-74, 3-83
After Off-Road Driving.....................................4-28
Air Bag Systems.............................................1-51
How Does an Air Bag Restrain?....................1-58
Servicing Your Air Bag-Equipped Vehicle.........1-60
What Makes an Air Bag In¯ate?....................1-57
What Will You See After an
Air Bag In¯ates?......................................1-58
When Should an Air Bag In¯ate?...................1-56
Where Are the Air Bags?..............................1-54
Air Bag .........................................................3-37
Readiness Light..........................................3-37
Air Cleaner/Filter, Engine.................................5-20
All Overseas Locations...................................... 7-4
AM .............................................................3-105
Antenna, Fixed Mast......................................3-107
Anti-Lock Brake, System Warning Light..............3-41
Anti-lock Brake System..................................... 4-6
Appearance Care............................................5-80
Care of Safety Belts....................................5-83Appearance Care (cont.)
Chemical Paint Spotting...............................5-86
Cleaning the Inside of Your Vehicle................5-80
Cleaning the Outside of Your Vehicle..............5-83
Finish Damage............................................5-86
Sheet Metal Damage...................................5-85
Underbody Maintenance...............................5-86
Vehicle Care/Appearance Materials................5-86
Weatherstrips..............................................5-83
Approaching a Hill..........................................4-20
Ashtrays........................................................3-20
Audio Speakers..............................................3-94
Audio System(s).............................................3-63
Audio Steering Wheel Controls....................3-105
Care of Your Cassette Tape Player...............3-106
Care of Your CD and DVD Player................3-107
Care of Your CDs and DVDs.......................3-107
Chime Level Adjustment.............................3-107
Fixed Mast Antenna...................................3-107
Audio Systems..............................................3-104
Radio Personalization.................................3-104
Audio System(s).............................................3-71
Radio with Cassette and CD.........................3-71
Radio with CD............................................3-64
Radio with Six-Disc CD................................3-81
Rear Seat Audio (RSA)...............................3-103
Setting the Time..........................................3-63
Theft-Deterrent Feature...............................3-104
Understanding Radio Reception...................3-105
Automatic Headlamp System............................3-15
1

Automatic Transfer Case..................................2-25
Automatic Transmission Check..........................6-12
Automatic Transmission Shift Lock Control
System Check.............................................6-14
Automatic Transmission...................................5-21
Fluid..........................................................5-21
Operation...................................................2-23
B
Backglass Wiper Blade Replacement.................5-54
Backing Up....................................................4-57
BATTERY NOT CHARGING.............................3-60
Battery Replacement......................................... 2-7
Battery Run-Down Protection............................3-19
Battery..........................................................5-41
Before Leaving on a Long Trip.........................4-35
Before You Drive............................................3-92
Before You Go Off-Roading..............................4-15
Body Lubrication Service..................................6-13
Brake Adjustment............................................5-40
Brake Fluid....................................................5-38
Brake Pedal Travel.........................................5-40
Brake Wear...................................................5-40
Brake............................................................2-28
Parking......................................................2-28
System Inspection.......................................6-17
System Warning Light..................................3-39
Brakes..........................................................5-38Braking in Emergencies..................................... 4-8
Braking........................................................... 4-5
Break-In, New Vehicle.....................................2-19
Bulb Replacement...........................................5-50
Front Turn Signal and Sidemarker Lamps.......5-51
Halogen Bulbs............................................5-50
Headlamps.................................................5-50
Replacement Bulbs......................................5-52
Taillamps and Turn Signal Lamps..................5-51
Buying New Tires...........................................5-58
C
California Fuel.................................................. 5-5
Canada........................................................... 7-4
Canadian Owners................................................ ii
Canadian Roadside Assistance........................... 7-7
Capacities and Speci®cations..........................5-102
Carbon Monoxide...................4-39, 4-50, 2-13, 2-33
Care of.........................................................5-83
Safety Belts................................................5-83
Your Cassette Tape Player..........................3-106
Your CD and DVD Player...........................3-107
Your CDs and DVDs..................................3-107
Cargo Cover..................................................2-50
Cargo Tie Downs............................................2-50
Cassette Tape Messages.................................3-78
Cassette Tape Player Service...........................6-11
Chains, Tires..................................................5-62
2