Footnotes
† = The U.S. Environmental Protection Agency or the
California Air Resources Board has determined that the
failure to perform this maintenance item will not nullify
the emission warranty or limit recall liability prior to
the completion of the vehicle’s useful life. We, however,
urge that all recommended maintenance services be
performed at the indicated intervals and the
maintenance be recorded.
(1)= If your vehicle has an Allison Transmission
®, your
GM owner manual is supplemented by an Allison
Transmission
®Operator’s Manual. Always refer to these
manuals for related maintenance services.
(2)= An Emission Control Service.
(3)= A Noise Emission Control Device.
(4)= Applies to vehicles sold in the United States and is
recommended for vehicles sold in Canada.(5)= Check fluid level in brake master cylinder, power
steering pump, axle, transmission, and hydraulic
spring parking brake pump (if equipped). A low fluid
level in the brake master cylinder can indicate
worn brake linings and should be checked accordingly.
(6)= Inspect brake lines and hoses for proper
hook-up, binding, leaks, cracks, chafing, etc. Inspect
disc brake pads for wear and rotors for surface
condition. Inspect caliper assemblies. Check brake
pedal for excessive free play or travel (or every
6 months, whichever occurs first) and have serviced if
needed. Check brakes more often if driving habits
and conditions result in frequent braking.
(7)= This vehicle has the Engine Oil Life System. This
system will show you when to change the engine oil
and filter — usually between 3,000 miles (5 000 km) and
12,000 miles (20 000 km) since your last oil change.
Under severe conditions, the indicator may come
on before 3,000 miles (5 000 km). Never drive your
7.8L diesel engine vehicle more than 12,000 miles
(20 000 km), or 12 months, or 600 engine hours, without
an oil and filter change.
6-22
Starter Switch Check
{CAUTION:
When you are doing this inspection, the
vehicle could move suddenly. If the vehicle
moves, you or others could be injured.
1. Before you start, be sure you have enough room
around the vehicle.
2. Firmly apply both the parking brake and the regular
brakes.
Do not use the accelerator pedal, and be ready to
turn off the engine immediately if it starts.
3. On automatic transmission vehicles, try to start the
engine in each gear. The starter should work only
in PARK (P), if equipped, or NEUTRAL (N). If
the starter works in any other position, your vehicle
needs service. On manual transmission vehicles,
the starter should work only when the clutch pedal is
all the way down.
Automatic Transmission Shift
Indicator Check
Check that the indicator points to the gear chosen.
Steering Check
Be alert for any changes in steering action, abnormal
front tire wear or steering wheel position. An inspection
or service is needed when the steering wheel is
harder to turn or has too much free play, or if there are
strange sounds when turning or parking.
Brake System Check
Be alert to illumination of the low air warning lamp or for
the tone alarm, or changes in braking action, such as
repeated pulling to one side, unusual sounds when
braking or increased brake pedal travel. Make sure air
brake system reservoirs are drained daily with full
system air pressure, and check system for leaks. Any of
these conditions could indicate the need for brake
system inspection and/or service.
Engine Cooling System Service
Inspect the hoses and have them replaced if they are
cracked, swollen, or deteriorated. Inspect all pipes,
fittings, and clamps; replace as needed. Clean
the outside of the radiator and air conditioning
condenser. To help ensure proper operation, a pressure
test of the cooling system and pressure cap is
recommended at least once a year.
6-30
Customer Assistance Information (cont.)
Reporting Safety Defects to the
United States Government.........................7-10
Roadside Assistance Program......................... 7-5
Service Publications Ordering Information........7-11
D
Daytime Running Lamps..................................3-15
Daytime Running Lamps Indicator Light.............3-43
Defensive Driving............................................. 4-2
Diesel Engine
Engine Alarm and Automatic Shutdown...........2-20
Exhaust Brake............................................2-27
Exhaust Restrictor.......................................2-22
Fuel............................................................ 5-7
High Idle System.........................................2-21
Starting......................................................2-15
Differential Lock Control, Rear Axle...................4-11
Differential Lock Indicator Light.........................3-42
Doing Your Own Service Work........................... 5-4
Dome Lamps .................................................3-16
Door
Locks.......................................................... 2-6
Power Door Locks......................................... 2-7Driver
Position, Safety Belt.....................................1-15
Driving
At Night.....................................................4-18
City ...........................................................4-23
Defensive..................................................... 4-2
Drunken....................................................... 4-3
Freeway.....................................................4-24
Hill and Mountain Roads..............................4-26
In Rain and on Wet Roads...........................4-20
Rocking Your Vehicle to Get it Out.................4-32
Tow Hooks.................................................4-33
Winter........................................................4-27
Dual Tire Operation.........................................5-76
E
Electrical System
Add-On Equipment......................................5-92
Fuses and Circuit Breakers...........................5-93
Fusible Links..............................................5-93
Headlamp Wiring.........................................5-93
Instrument Panel Fuse Block.........................5-94
Power Windows and Other Power Options......5-93
Underhood Fuse Block.................................5-96
Windshield Wiper Fuses...............................5-93
4
Engine
Air Cleaner/Filter.........................................5-35
Alarm and Automatic Shutdown.....................2-20
Battery.......................................................5-58
Change Engine Oil Light...............................3-40
Check and Service Engine Soon Light............3-38
Checks Before Operating..............................2-24
Coolant..............................................5-38, 5-40
Coolant Heater............................................2-26
Coolant Temperature Gage...........................3-36
Diesel Engine Exhaust Brake........................2-27
Exhaust.....................................................2-45
Exhaust Restrictor.......................................2-22
Fan Breakage............................................... 5-5
Fan Noise..................................................5-47
High Idle System.........................................2-21
Oil .....................................................5-24, 5-28
Oil Life System...........................5-31, 5-33, 5-34
Overheating................................................5-40
Overspeed Warning Light..............................3-40
Reduced Power Light...................................3-42
Shutdown Warning Light...............................3-40
Speed Limiter.............................................3-28
Starter Over-Crank Protection........................2-12
Starting Your Diesel.....................................2-15
Starting Your Gasoline..................................2-13Entry Lighting.................................................3-17
Event Data Recorders (EDR)............................. 7-6
Exhaust Brake Indicator Light...........................3-41
Exhaust Restrictor...........................................2-22
Extender, Safety Belt.......................................1-28
Exterior Lamps...............................................3-14
F
Filter
Engine Air Cleaner......................................5-35
Filter Minder Gage..........................................3-46
Finish Damage...............................................5-89
Fixed Mast Antenna........................................3-67
Flashers, Hazard Warning.................................. 3-6
Flat Tire........................................................5-82
Fluid
Automatic Transmission................................5-36
Manual Transmission....................................5-37
Power Steering...........................................5-47
Windshield Washer......................................5-48
Four-Wheel Drive....................................2-35, 5-65
Front Axle......................................................5-66
Front Wheel Bearings with Oil-Filled Hubs..........5-73
5
L
Lamps
Dome ........................................................3-16
Exterior......................................................3-14
Marker.......................................................3-16
Reading.....................................................3-17
LATCH System
Child Restraints...........................................1-41
Light
Airbag Off..................................................3-30
Airbag Readiness........................................3-29
Anti-Lock Brake System Warning...................3-35
Brake System Warning.................................3-33
Change Engine Oil......................................3-40
Charging System.........................................3-31
Check Gages Warning.................................3-44
Daytime Running Lamps Indicator..................3-43
Differential Lock Indicator..............................3-42
Engine Overspeed Warning...........................3-40
Engine Shutdown Warning............................3-40
Exhaust Brake Indicator................................3-41
Highbeam On.............................................3-43
Low Coolant Warning...................................3-37
Low Oil Level.............................................3-39
Low Washer Fluid Warning...........................3-44
Malfunction Indicator....................................3-38Light (cont.)
Range Inhibit Warning Indicator.....................3-33
Reduced Engine Power................................3-42
Safety Belt Reminder...................................3-28
Safety Belt Reminder Tone...........................3-28
Service Transmission Warning.......................3-32
Trailer Anti-Lock Brake System Warning..........3-36
Wait to Start Indicator..................................3-37
Water in Fuel Warning.................................3-46
Lighting
Entry.........................................................3-17
Loading Your Vehicle.......................................4-34
Locks
Door ........................................................... 2-6
Power Door.................................................. 2-7
Loss of Control...............................................4-17
Low Coolant Warning Light..............................3-37
Low Washer Fluid Warning Light.......................3-44
M
Maintenance, Normal Replacement Parts..........5-104
Maintenance Schedule
At Each Fuel Fill.........................................6-28
At Least Once a Year..................................6-32
At Least Twice a Year..................................6-29
8
Maintenance Schedule (cont.)
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.............6-28
PartC-Recommended Fluids and
Lubricants...............................................6-33
PartD-Maintenance Record........................6-35
Scheduled Maintenance................................. 6-5
Scheduled Maintenance Supplements............... 6-4
Using.......................................................... 6-4
Your Vehicle and the Environment................... 6-2
Malfunction Indicator Light................................3-38
Manual Transmission
Fluid..........................................................5-37
Operation...................................................2-31
Manual Windows.............................................. 2-9
Marker Lamps................................................3-16
Mirrors
Manual Rearview Mirror................................2-47
Outside Convex Mirrors................................2-48
Outside Heated Mirrors................................2-48
Outside Manual Mirrors................................2-47
Outside Power Mirrors..................................2-47N
New Vehicle Break-In......................................2-11
Noise Control System, Tampering......................5-67
Normal Maintenance Replacement Parts...........5-104
O
Odometer......................................................3-27
Odometer, Trip...............................................3-27
Off-Road Recovery..........................................4-15
Oil
Change Engine Oil Light...............................3-40
Engine...............................................5-24, 5-28
Low Oil Level Light......................................3-39
Pressure Gage............................................3-38
Oil, Engine Oil Life System..............5-31, 5-33, 5-34
Older Children, Restraints................................1-28
Other Service Items
Air Conditioning System...............................5-74
Automatic Ether Injection System...................5-72
Front Wheel Bearings with Oil-Filled Hubs.......5-73
Fuel Filter...................................................5-70
Primary Fuel Filter and Water Separator.........5-71
Secondary Fuel Filter and Water
Separator/Heater......................................5-71
9