ECU GMC ENVOY 2003 Service Manual

At Least Twice a Year
Restraint System Check
Make sure the safety belt reminder light and all your
belts, buckles, latch plates, retractors and anchorages
are working properly. Look for any other loose or
damaged safety belt system parts. If you see anything
that might keep a safety belt system from doing its
job, have it repaired. Have any torn or frayed safety belts
replaced.
Also look for any opened or broken air bag coverings,
and have them repaired or replaced. (The air bag
system does not need regular maintenance.)
Wiper Blade Check
Inspect wiper blades for wear or cracking. Replace
blade inserts that appear worn or damaged or that
streak or miss areas of the windshield. Also see
Cleaning the Outside of Your Vehicle on page 5-83.
Spare Tire Check
At least twice a year, after the monthly in¯ation check of
the spare tire determines that the spare is in¯ated to
the correct tire in¯ation pressure, make sure that
the spare tire is stored securely. Push, pull, and then try
to rotate or turn the tire. If it moves, use the wheel
wrench/ratchet to tighten the cable. See
Changing a Flat
Tire on page 5-64.
Weatherstrip Lubrication
Silicone grease on weatherstrips will make them last
longer, seal better, and not stick or squeak. Apply
silicone grease with a clean cloth. During very cold,
damp weather more frequent application may be
required. See
Part D: Recommended Fluids and
Lubricants on page 6-18.
Automatic Transmission Check
Check the transmission ¯uid level; add if needed. SeeAutomatic Transmission Fluid on page 5-21. A ¯uid loss
may indicate a problem. Check the system and repair
if needed.
6-12

Charging System Light....................................3-38
CHECK WASHER FLUID.................................3-61
Checking Brake Fluid......................................5-39
Checking Coolant............................................5-25
Checking Engine Oil........................................5-15
Checking Things Under the Hood......................5-10
Checking Your Restraint Systems......................1-60
Check...........................................................3-42
Engine Light...............................................3-42
Gages Warning Light...................................3-48
Chemical Paint Spotting...................................5-86
Child Restraints..............................................1-36
Child Restraint Systems...............................1-36
Infants and Young Children...........................1-32
Lower Anchorages and Top Tethers for
Children (LATCH System)..........................1-42
Older Children.............................................1-30
Securing a Child Restraint Designed for
the LATCH System...................................1-44
Securing a Child Restraint in a Rear
Outside Seat Position...............................1-45
Securing a Child Restraint in the Center
Seat Position...........................................1-48
Securing a Child Restraint in the Right
Front Seat Position...................................1-48
Top Strap Anchor Location............................1-41
Top Strap...................................................1-40
Where to Put the Restraint...........................1-39
Chime Level Adjustment.................................3-107
Cigarette Lighter.............................................3-20Cleaning Aluminum Wheels..............................5-85
Cleaning Exterior Lamps/Lenses.......................5-84
Cleaning Fabric/Carpet....................................5-80
Cleaning Glass Surfaces..................................5-82
Cleaning Interior Plastic Components.................5-82
Cleaning Leather............................................5-82
Cleaning the Top of the
Instrument Panel.........................................5-82
Cleaning the Windshield, Backglass and
Wiper Blades..............................................5-85
Cleaning Tires................................................5-85
Cleaning Vinyl................................................5-82
Cleaning........................................................5-80
Inside of Your Vehicle..................................5-80
Outside of Your Vehicle................................5-83
Underbody Maintenance...............................5-86
Video Screen............................................3-107
Weatherstrips..............................................5-83
Climate Control System...................................3-33
Climate Controls Personalization....................3-33
Dual Automatic............................................3-24
Dual..........................................................3-21
Rear..........................................................3-29
Steering Wheel Controls...............................3-33
Compact Disc Messages.................3-70, 3-80, 3-92
Compass Calibration.......................................2-35
Compass Operation.........................................2-35
Compass Variance..........................................2-36
Content Theft-Deferrent....................................2-17
Control of a Vehicle.......................................... 4-5
3

Convenience Net............................................2-49
Coolant.........................................................3-41
Engine Temperature Gage............................3-41
Heater, Engine............................................2-22
Cooling System..............................................5-29
Cruise Control Light........................................3-47
Cruise Control................................................3-12
Current and Past Model Order Forms................7-11
Customer Assistance Information........................ 7-7
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....7-10
Reporting Safety Defects to the Canadian
Government.............................................. 7-9
Reporting Safety Defects to the United
States Government.................................... 7-9
Roadside Assistance Program......................... 7-5
Service Publications Ordering Information........7-10
D
Daytime Running Lamps (DRL).........................3-16
Defensive Driving............................................. 4-2
Defogging and Defrosting.........................3-22, 3-27Delayed Locking............................................... 2-9
Dinghy Towing................................................4-46
Doing Your Own Service Work........................... 5-3
Dome Lamp Override......................................3-18
Dome Lamps.................................................3-19
Door............................................................... 2-9
Delayed Locking........................................... 2-9
Locks.......................................................... 2-8
Power Door Locks......................................... 2-9
Programmable Automatic Door Locks.............2-10
Rear Door Security Locks.............................2-12
DRIVER DOOR AJAR.....................................3-62
Driver Information Center (DIC).........................3-50
DIC Operation and Displays..........................3-51
DIC Warnings and Messages........................3-60
Driver............................................................1-14
Position, Safety Belt.....................................1-14
Driving Across an Incline..................................4-24
Driving Downhill..............................................4-23
Driving in Mud, Sand, Snow or Ice....................4-26
Driving in Water..............................................4-27
Driving On Grades..........................................4-58
Driving on Off-Road Hills.................................4-19
Driving on Snow or Ice....................................4-40
Driving Through Deep Standing Water...............4-31
Driving Through Flowing Water.........................4-32
Driving Uphill..................................................4-20
Driving with a Trailer.......................................4-56
Driving..........................................................4-28
At Night.....................................................4-28
4

Inspection......................................................6-17
Brake System.............................................6-17
Engine Cooling System................................6-17
Exhaust System..........................................6-16
Fuel System...............................................6-16
Part C - Periodic Maintenance.......................6-16
Steering, Suspension and Front Drive Axle
Boot and Seal.........................................6-16
Transfer Case and Front Axle
(Four-Wheel Drive)...................................6-17
Instrument Panel Brightness.............................3-17
Instrument Panel.............................................3-35
Cluster.......................................................3-35
Overview..................................................... 3-4
Interior Lamps................................................3-17
J
Jump Starting.................................................5-42
K
Key Lock Cylinders Service..............................6-13
Keyless Entry System....................................... 2-5
Keys............................................................... 2-3
L
Lamps On Reminder.......................................3-16
Lamps...........................................................3-15
Exterior......................................................3-15
Interior.......................................................3-17
Lap-Shoulder Belt...................................1-15, 1-24
LATCH System...............................................1-42
Child Restraints...........................................1-42
Securing a Child Restraint Designed for
the LATCH System...................................1-44
Leaving Your Vehicle With the Engine
Running.....................................................2-30
Leaving Your Vehicle.......................................2-12
LEFT REAR DOOR AJAR................................3-62
Liftgate Release..............................................2-13
Liftgate/Liftglass..............................................2-13
Liftglass/Liftgate..............................................2-13
Lighted Visor Vanity Mirror...............................2-16
Light.............................................................3-37
Air Bag Readiness.......................................3-37
Anti-Lock Brake System Warning...................3-41
Brake System Warning.................................3-39
Change Engine Oil......................................3-46
Charging System.........................................3-38
Check Gages Warning.................................3-48
Cruise Control.............................................3-47
Gate Ajar...................................................3-49
Low Fuel Warning.......................................3-50
Malfunction Indicator....................................3-42
8

Light (cont.)
Reduced Engine Power................................3-47
Safety Belt Reminder...................................3-37
Security.....................................................3-46
Service Four-Wheel-Drive Warning Light.........3-48
Loading Your Vehicle for Off-Road Driving..........4-16
Loading Your Vehicle.......................................4-47
Locking Rear Axle...........................................4-10
Lockout Protection..........................................2-12
Locks............................................................. 2-9
Delayed Locking........................................... 2-9
Door........................................................... 2-8
Leaving Your Vehicle....................................2-12
Lockout Protection.......................................2-12
Power Door.................................................. 2-9
Programmable Automatic Door Locks.............2-10
Rear Door Security Locks.............................2-12
Loss of Control...............................................4-14
Low Fuel Warning Light...................................3-50
Luggage Carrier..............................................2-48
Lumbar........................................................... 1-2
Power Controls............................................. 1-2
M
Maintenance, Normal Replacement Parts..........5-104
Maintenance Schedule.....................................6-11
At Each Fuel Fill.........................................6-11
At Least Once a Month................................6-11Maintenance Schedule (cont.)
At Least Once a Year..................................6-13
At Least Twice a Year..................................6-12
Brake System Inspection..............................6-17
Engine Cooling System Inspection.................6-17
Exhaust System Inspection...........................6-16
Fuel System Inspection................................6-16
How This Section is Organized....................... 6-3
Introduction.................................................. 6-2
Maintenance Requirements............................. 6-2
Part A - Scheduled Maintenance Services......... 6-4
Part B - Owner Checks and Services.............6-11
Part C - Periodic MaintenanceInspections......6-16
Part D - Recommended Fluids and
Lubricants...............................................6-18
Part E - Maintenance Record........................6-20
Scheduled Maintenance................................. 6-5
Steering, Suspension and Front Drive Axle
Boot and Seal Inspection..........................6-16
Transfer Case and Front Axle (Four-Wheel
Drive) Inspection......................................6-17
Using Your................................................... 6-4
Your Vehicle and the Environment................... 6-2
Maintenance When Trailer Towing.....................4-59
Making Turns.................................................4-57
Malfunction Indicator Light................................3-42
Matching Transmitter(s) to Your Vehicle............... 2-6
Memory Seat.................................................2-51
9

Radios (cont.)
Rear Seat Audio........................................3-103
Setting the Time..........................................3-63
Theft-Deterrent..........................................3-104
Understanding Reception............................3-105
RainsenseŸ Wipers........................................3-10
RDS Messages..............................3-68, 3-75, 3-86
Reading Lamps..............................................3-19
REAR ACCESS OPEN....................................3-61
Rear Axle......................................................5-48
Locking......................................................4-10
Rear Climate Control System............................3-29
Rear Compartment Storage Panel/Cover............2-46
Rear Door Security Locks................................2-12
Rear Floor Storage Lid....................................2-49
Rear Safety Belt Comfort Guides......................1-26
Rear Seat Audio (RSA)..................................3-103
Rear Seat Entertainment System.......................3-92
Rear Seat Operation......................................... 1-6
Rear Seat Passenger Positions.........................1-23
Rear Seat Passengers, Safety Belts..................1-23
Rear Seats (Envoy XL)..................................... 1-7
Rear Underseat Fuse Block..............................5-97
Rear Window Defogger............................3-23, 3-27
Rearview Mirror, Automatic Dimming with
OnStar
žand Compass.................................2-35
Reclining Seatbacks, Power............................... 1-4
Recreational Vehicle Towing.............................4-45
Reduced Engine Power Light............................3-47Remote Control..............................................3-97
Remote Keyless Entry System, Operation............ 2-6
Remote Keyless Entry System............................ 2-5
Removing the Flat Tire and Installing the
Spare Tire..................................................5-72
Removing the Spare Tire and Tools...................5-66
Replacement Bulbs.........................................5-52
Replacing Brake System Parts..........................5-41
Replacing Restraint System Parts
After a Crash..............................................1-61
Reporting Safety Defects................................... 7-9
Canadian Government................................... 7-9
General Motors...........................................7-10
United States Government.............................. 7-9
Reprogramming a Single HomeLink
žButton.......2-43
Resetting Defaults...........................................2-44
Restraint System Check...................................6-12
Checking Your Restraint Systems...................1-60
Replacing Restraint System Parts
After a Crash..........................................1-61
Restraint Systems...........................................1-60
Checking....................................................1-60
Replacing Parts...........................................1-61
Retained Accessory Power (RAP)......................2-20
RFA # BATTERY LOW....................................3-62
Right Front Passenger Position, Safety Belts......1-22
RIGHT REAR DOOR AJAR..............................3-62
Roadside......................................................... 7-5
Assistance Program....................................... 7-5
12

Rocking Your Vehicle To Get It Out...................4-44
Running Your Engine While You Are Parked.......2-33
S
Safety Belt.....................................................3-37
Reminder Light............................................3-37
Safety Belts...................................................5-83
Care of......................................................5-83
Driver Position............................................1-14
How to Wear Safety Belts Properly................1-14
Questions and Answers About Safety Belts.....1-13
Rear Safety Belt Comfort Guides for Children
and Small Adults......................................1-26
Rear Seat Passengers.................................1-23
Right Front Passenger Position......................1-22
Safety Belt Extender....................................1-29
Safety Belt Use During Pregnancy.................1-22
Safety Belts Are for Everyone......................... 1-9
Safety Chains.................................................4-55
Safety Warnings and Symbols.............................. iii
Scanning the Terrain.......................................4-18
Scheduled Maintenance..................................... 6-5
Seat............................................................... 1-5
Head Restraints............................................ 1-5
Seats.............................................................. 1-3
Heated Seats............................................... 1-3
Memory.....................................................2-51
Power Lumbar.............................................. 1-2Seats (cont.)
Power Reclining Seatbacks............................. 1-4
Power Seats................................................. 1-2
Rear Seat Operation...................................... 1-6
Securing a Child Restraint................................1-48
Center Seat Position....................................1-48
Designed for the LATCH System...................1-44
Rear Outside Seat Position...........................1-45
Right Front Seat Position..............................1-48
Security Light.................................................3-46
Select...........................................................3-59
SERVICE AIR BAG.........................................3-60
SERVICE BRAKE SYSTEM.............................3-61
Service Bulletins.............................................7-11
Service Engine Soon Light in the United States
or Check Engine Light in Canada..................3-42
Service Manuals.............................................7-10
Service........................................................... 5-3
Adding Equipment to the Outside of Your
Vehicle..................................................... 5-4
Doing Your Own Work................................... 5-3
Engine Soon Light.......................................3-42
Four-Wheel-Drive Warning Light.....................3-48
Publications Ordering Information...................7-10
Setting Preset PTYs........................................3-85
Setting Preset Stations....................3-65, 3-72, 3-82
Setting the Time.............................................3-63
Setting the Tone (Bass/Treble)..........3-66, 3-73, 3-83
Sheet Metal Damage.......................................5-85
Shifting Into Park (P).......................................2-29
13