2003 GMC SONOMA four wheel drive

Maintenance Schedule......................................6-2
Introduction...................................................6-2
Your Vehicle and the Environment....................6-2
Maintenance Requirements..............................6-2
How This Section is Organized.........................6-3
Part A: Scheduled Maintenance Services...........6-4
Using Your Maintenance Schedule....................6-4
Selecting the Right Schedule...........................6-5
Short Trip/City Scheduled Maintenance..............6-7
Long Trip/Highway Scheduled Maintenance......6-18
Part B: Owner Checks and Services................6-26
At Each Fuel Fill..........................................6-26
At Least Once a Month.................................6-26
At Least Twice a Year...................................6-26At Least Four Times a Year...........................6-27
At Least Once a Year...................................6-28
Part C: Periodic Maintenance Inspections.........6-31
Steering, Suspension and Front Drive Axle
Boot and Seal Inspection............................6-31
Exhaust System Inspection............................6-31
Fuel System Inspection..................................6-31
Engine Cooling System Inspection...................6-31
Throttle System Inspection.............................6-32
Transfer Case and Front Axle (Four-Wheel
Drive) Inspection.......................................6-32
Brake System Inspection................................6-32
Part D: Recommended Fluids and Lubricants. . . .6-33
Part E: Maintenance Record...........................6-35
Section 6 Maintenance Schedule
6-1
2003 - Sonoma OM

Part A: Scheduled Maintenance
Services
In this part are scheduled maintenance services which
are to be performed at the mileage intervals specified.
Using Your Maintenance Schedule
We at General Motors want to help you keep your
vehicle in good working condition. But we don’t know
exactly how you’ll drive it. You may drive very short
distances only a few times a week. Or you may drive
long distances all the time in very hot, dusty weather.
You may use your vehicle in making deliveries.
Or you may drive it to work, to do errands or in many
other ways.
Because of all the different ways people use their
vehicles, maintenance needs vary. You may need more
frequent checks and replacements. So please read
the following and note how you drive. If you have any
questions on how to keep your vehicle in good condition,
see your dealer.This part tells you the maintenance services you should
have done and when to schedule them.
When you go to your dealer for your service needs,
you’ll know that GM-trained and supported service
people will perform the work using genuine GM parts.
The properfluids and lubricants to use are listed in Part
D. Make sure whoever services your vehicle uses these.
All parts should be replaced and all necessary repairs
done before you or anyone else drives the vehicle.
These schedules are for vehicles that:
•carry passengers and cargo within recommended
limits. You willfind these limits on your vehicle’s
Certification/Tire label. SeeLoading Your Vehicle
on page 4-46.
•are driven on reasonable road surfaces within legal
driving limits.
•are driven off-road in the recommended manner.
SeeOff-Road Driving with Your Four-Wheel-Drive
Vehicle on page 4-13.
•use the recommended fuel. SeeGasoline Octane
on page 5-4.
6-4
2003 - Sonoma OM

Throttle System Inspection
Inspect the throttle system for interference or binding,
and for damaged or missing parts. Replace parts
as needed. Replace any components that have high
effort or excessive wear. Do not lubricate accelerator
and cruise control cables.
Transfer Case and Front Axle
(Four-Wheel Drive) Inspection
Every 12 months or at engine oil change intervals,
check front axle and transfer case and add lubricant
when necessary. Auid loss could indicate a problem;
check and have it repaired, if needed. Check vent
hose at transfer case for kinks and proper installation.
More frequent lubrication may be required on
off-road use.
Brake System Inspection
Inspect the complete system. Inspect brake lines and
hoses for proper hook-up, binding, leaks, cracks,
chang, etc. Inspect disc brake pads for wear and rotors
for surface condition. Also inspect drum brake linings
for wear and cracks. Inspect other brake parts, including
drums, wheel cylinders, calipers, parking brake, etc.
Check parking brake adjustment. You may need to have
your brakes inspected more often if your driving
habits or conditions result in frequent braking.
6-32
2003 - Sonoma OM

Flat Tire........................................................5-67
Flat Tire, Changing.........................................5-68
Fluid
Automatic Transmission................................5-20
Manual Transmission....................................5-23
Power Steering...........................................5-37
Windshield Washer......................................5-38
FM ...............................................................3-67
Fog Lamps ....................................................3-13
Following Distance..........................................4-57
Four-Wheel Drive....................................2-29, 5-48
Front Axle......................................................5-49
Front Map Lamps...........................................3-14
Front Storage Area.........................................2-49
Fuel............................................................... 5-4
Additives...................................................... 5-5
California Fuel.............................................. 5-5
Filling a Portable Fuel Container..................... 5-8
Filling Your Tank........................................... 5-6
Fuels in Foreign Countries.............................. 5-6
Gage .........................................................3-35
Gasoline Octane........................................... 5-4
Gasoline Specifications.................................. 5-5
Low Warning Light.......................................3-35
System Inspection
.......................................6-31
Fuses
Fuses and Circuit Breakers
...........................5-89
Windshield Wiper
.........................................5-88G
Gage
Check Gages Warning Light..........................3-34
Engine Coolant Temperature.........................3-29
Fuel..........................................................3-35
Oil Pressure...............................................3-32
Speedometer..............................................3-23
Tachometer.................................................3-23
Voltmeter Gage...........................................3-26
Garment Hooks..............................................2-50
Gasoline
Octane........................................................ 5-4
Specifications............................................... 5-5
Getting Familiar with Off-Road Driving................4-16
Glass Surfaces...............................................5-81
Glove Box.....................................................2-41
GM Mobility Program for Persons with
Disabilities.................................................... 7-5
H
Hazard Warning Flashers................................... 3-3
Head Restraints............................................... 1-7
Headlamp High/Low-Beam Changer.................... 3-6
Headlamps....................................................5-50
Bulb Replacement.......................................5-50
Electrical System.........................................5-88
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2003 - Sonoma OM

Headlamps (cont.)
Halogen Bulbs............................................5-50
One-Piece Front Turn Signal Lamps...............5-52
Two-Piece Front Turn Signal Lamps...............5-53
Heated Seats................................................... 1-5
Heating.........................................................3-18
Highway Hypnosis...........................................4-34
Hill and Mountain Roads..................................4-34
Hitches..........................................................4-56
Hood
Checking Things Under.................................. 5-8
Release....................................................... 5-9
Horn ............................................................... 3-4
How to Add Coolant to the Coolant
Recovery Tank............................................5-32
How to Add Coolant to the Radiator..................5-34
How to Add Fluid....................................5-22, 5-24
How to Check................................5-20, 5-23, 5-59
How to Check and Add Fluid
............................5-25
How to Check Lubricant
..........................5-47, 5-49
How to Check Power Steering Fluid
..................5-37
How to Inspect the Engine Air Cleaner/Filter
.......5-19
How to Use This Manual
...................................... ii
How to Wear Safety Belts Properly
...................1-15
Hydraulic Clutch
.............................................5-24
Hydraulic Clutch System Check
........................6-27
Hydroplaning
..................................................4-30I
If No Steam Is Coming From Your Engine..........5-29
If Steam Is Coming From Your Engine...............5-28
If the Light Is Flashing.....................................3-30
If the Light Is On Steady.................................3-31
If You Are Stuck in Sand, Mud, Ice or Snow.......4-40
If You Do Decide To Pull A Trailer.....................4-52
If You’re Caught in a Blizzard...........................4-38
Ignition Positions.............................................2-20
Ignition Transmission Lock Check......................6-29
Infants and Young Children, Restraints...............1-32
Inflation–Tire Pressure...................................5-58
Inspection
Brake System.............................................6-32
Engine Cooling System................................6-31
Exhaust System..........................................6-31
Fuel System...............................................6-31
Part C - Periodic Maintenance.......................6-31
Steering, Suspension and Front Drive
Axle Boot and Seal..................................6-31
Throttle System...........................................6-32
Transfer Case and Front Axle
(Four-Wheel Drive)...................................6-32
Installing a Garage Door Opener.......................2-43
Instrument Panel
Cluster.......................................................3-21
Overview..................................................... 3-2
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2003 - Sonoma OM

Instrument Panel Brightness.............................3-14
Instrument Panel Fuse Block............................5-89
Interior Lamps................................................3-14
Interior Plastic Components..............................5-81
J
Jump Seat.....................................................1-10
Jump Starting.................................................5-43
K
Key Lock Cylinders Service..............................6-28
Key Release Button........................................2-21
Keyless Entry System....................................... 2-4
Keys............................................................... 2-3
L
Lamps
Exterior......................................................3-10
Interior.......................................................3-14
Lamps On Reminder.......................................3-12
Lap Belt................................................1-23, 1-25
Lap-Shoulder Belt...........................................1-16LATCH System
Child Restraints
...........................................1-44
Securing a Child Restraint Designed for the
LATCH System
........................................1-46
Latches, Seatback
............................................ 1-8
Leather
.........................................................5-81
Leaving Your Vehicle
.......................................2-11
Leaving Your Vehicle With the Engine Running
. . . 2-34
Light
Air Bag Off
.................................................3-24
Air Bag Readiness
.......................................3-24
Anti-Lock Brake System Warning
...................3-28
Brake System Warning
.................................3-27
Charging System
.........................................3-26
Check Gages Warning
.................................3-34
Low Fuel Warning
.......................................3-35
Malfunction Indicator
....................................3-29
Safety Belt Reminder
...................................3-23
Security
.....................................................3-33
Service Four-Wheel-Drive Warning Light
.........3-34
Up-Shift
.....................................................3-27
Loading Your Vehicle
.......................................4-46
Loading Your Vehicle for Off-Road Driving
..........4-14
Locking Rear Axle
............................................ 4-7
Lockout Protection
..........................................2-11
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2003 - Sonoma OM

Locks
Door ........................................................... 2-8
Leaving Your Vehicle....................................2-11
Lockout Protection.......................................2-11
Power Door .................................................. 2-9
Programmable Automatic Door Locks............... 2-9
Rear Door Security Locks.............................2-11
Long Trip/Highway Definition.............................. 6-6
Long Trip/Highway Intervals............................... 6-6
Long Trip/Highway Scheduled Maintenance........6-18
Loss of Control...............................................4-12
Low Fuel Warning Light...................................3-35
Luggage Carrier..............................................2-50
Lumbar
Manual Controls............................................ 1-4
Power Controls............................................. 1-5
M
Maintenance, Normal Replacement Parts............5-96
Maintenance Schedule
At Each Fuel Fill.........................................6-26
At Least Four Times a Year..........................6-27
At Least Once a Month................................6-26
At Least Once a Year..................................6-28
At Least Twice a Year..................................6-26Maintenance Schedule (cont.)
Brake System Inspection..............................6-32
Engine Cooling System Inspection.................6-31
Exhaust System Inspection...........................6-31
Fuel System Inspection................................6-31
How This Section is Organized....................... 6-3
Introduction.................................................. 6-2
Long Trip/Highway Scheduled Maintenance.....6-18
Maintenance Requirements............................. 6-2
Part A - Scheduled Maintenance Services......... 6-4
Part B - Owner Checks and Services.............6-26
Part C - Periodic Maintenance Inspections......6-31
PartD-Recommended Fluids and
Lubricants...............................................6-33
PartE-Maintenance Record........................6-35
Selecting the Right Schedule
.......................... 6-5
Short Trip/City Scheduled Maintenance
............. 6-7
Steering, Suspension and Front Drive
Axle Boot and Seal Inspection
...................6-31
Throttle System Inspection
............................6-32
Transfer Case and Front Axle
(Four-Wheel Drive) Inspection
....................6-32
Using Your
................................................... 6-4
Your Vehicle and the Environment
................... 6-2
Maintenance When Trailer Towing
.....................4-60
Making Turns
.................................................4-58
9
2003 - Sonoma OM

Seat
Head Restraints............................................ 1-7
Seatback Latches............................................. 1-8
Seats
Heated Seats............................................... 1-5
Jump Seat..................................................1-10
Manual........................................................ 1-3
Manual Lumbar............................................. 1-4
Memory .....................................................2-54
Power Lumbar .............................................. 1-5
Power Seats
................................................. 1-4
Rear Seat Operation
...................................... 1-9
Reclining Seatbacks
...................................... 1-6
Seatback Latches
.......................................... 1-8
Securing a Child Restraint
Center Seat Position
....................................1-49
Designed for the LATCH System
...................1-46
Rear Outside Seat Position
...........................1-46
Right Front Seat Position
..............................1-49
Security Light
.................................................3-33
Selecting the Right Schedule, Maintenance
.......... 6-5
Service
........................................................... 5-3
Adding Equipment to the Outside of
Your Vehicle
.............................................. 5-4
Doing Your Own Work
................................... 5-3
Engine Soon Light
.......................................3-29
Four-Wheel-Drive Warning Light
.....................3-34
Publications Ordering Information
..................... 7-9Service Bulletins.............................................7-10
Service Engine Soon Light in the United States
or Check Engine Light in Canada..................3-29
Service Manuals............................................... 7-9
Servicing Your Air Bag-Equipped
Vehicle.......................................................1-63
Setting Preset PTYs........................................3-61
Setting Preset Stations............3-38, 3-41, 3-48, 3-58
Setting the Time
Radios with Radio Data
Systems (RDS)........................................3-37
Radios without Radio Data
Systems (RDS)........................................3-36
Setting the Tone
(Bass/Treble)......................3-38, 3-41, 3-49, 3-58
Sheet Metal Damage.......................................5-85
Shift Speeds..................................................2-29
Shifting Into Park (P).......................................2-33
Shifting Out of Park (P)...................................2-35
Short Trip/City Definition.................................... 6-5
Short Trip/City Intervals..................................... 6-5
Short Trip/City Scheduled Maintenance................ 6-7
Skidding........................................................4-12
Sliding Rear Windows.....................................2-16
Some Other Rainy Weather Tips.......................4-30
Spare Tire Check............................................6-27
Special Fabric Cleaning Problems.....................5-80
Specifications, Capacities.................................5-94
Speedometer..................................................3-23
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2003 - Sonoma OM