
Before changing lanes, check your mirrors. Then use
your turn signal.
Once you are moving on the freeway, make certain you
allow a reasonable following distance. Expect to
move slightly slower at night.
When you want to leave the freeway, move to the
proper lane well in advance. If you miss your exit, do
not, under any circumstances, stop and back up. Drive
on to the next exit.
The exit ramp can be curved, sometimes quite
sharply. The exit speed for cars — but not larger
vehicles — is usually posted. You should go
more slowly.
Reduce your speed according to your speedometer, not
to your sense of motion. After driving for any distance
at higher speeds, you may tend to think you are
going slower than you actually are.Highway Hypnosis
Is there actually such a condition as highway hypnosis?
Or is it just plain falling asleep at the wheel? Call it
highway hypnosis, lack of awareness, or whatever.
When you drive the vehicle for a long distance, there is
something about an easy stretch of road with the
same scenery, along with the hum of the tires on the
road, the drone of the engine, and the rush of the wind
against the vehicle that can make you sleepy. Do
not let it happen to you! If it does, your vehicle can leave
the road in less than a second, and you could crash
and be injured.
What can you do about highway hypnosis? First, be
aware that it can happen.
Then here are some tips:
•Make sure your vehicle is well ventilated, with a
comfortably cool interior.
•Keep your eyes moving. Scan the road ahead and
to the sides. Check your mirrors and your
instruments frequently.
•If you get sleepy, pull off the road into a rest,
service, or parking area and take a nap, get some
exercise, or both. For safety, treat drowsiness
on the highway as an emergency.
4-23

Remember, unless you have ABS, if you brake so hard
that your wheels stop rolling, you will just slide. Brake
so your wheels always keep rolling and you can
still steer.
•Whatever your braking system, allow greater
following distance on any slippery road.
•Watch for slippery spots. The road might be fine
until you hit a spot that is covered with ice. On
an otherwise clear road, ice patches may appear in
shaded areas where the sun cannot reach, such
as around clumps of trees, behind buildings,
or under bridges. Sometimes the surface of a curve
or an overpass may remain icy when the
surrounding roads are clear. If you see a patch of
ice ahead of you, brake before you are on it. Try not
to brake while you are actually on the ice, and
avoid sudden steering maneuvers.
If You Are Caught in a Blizzard
If you are stopped by heavy snow, you could be in a
serious situation. You should probably stay with
your vehicle unless you know for sure that you are near
help and you can hike through the snow. Here are
some things to do to summon help and keep yourself
and your passengers safe:
•Turn on your hazard flashers.
•Tie a red cloth to your mirror arm to alert police that
you have been stopped by the snow.
•Put on extra clothing or wrap a blanket around you.
If you do not have blankets or extra clothing, make
body insulators from newspapers, burlap bags,
rags, floor mats — anything you can wrap around
yourself or tuck under your clothing to keep warm.
You can run the engine to keep warm, but be careful.
4-28

Circuit Breaker Usage
16 Air Bag System
17 Exterior/Interior Lamps
18 Parking Brake
19 Accessory Power
20 Ignition 4
21 Sidemarker Lamps
22 Turn Signal/Backup Lamps
23 Transmission
24 Hydraulics/Air Brake
A Spare
B Spare
Fuse Usage
HTD/MIRR Heated Mirrors
Blank Not Used
RT TRN TRLR Trailer Right Turn Signal
Blank Not Used
LT TRN TRLR Trailer Left Turn Signal
Blank Not Used
BRK Brake Warning Lamp
RT PRK Right-hand Parking Lamps
Blank Not Used
Blank Not Used
Fuse Usage
Blank Not Used
LT PARK Left-hand Parking Lamps
Blank Not Used
RT REAR
TRN/STOPRight Rear Turn Signal/Stoplamp
LT REAR
TRN/STOPLeft Rear Turn Signal/Stoplamp
RADIO Radio
Blank Not Used
Blank Not Used
Blank Not Used
PWR WNDW Power Windows
Relay Usage
ECU/PTO*Engine Control Unit/Power Take-Off
Diesel 7.8 DURAMAX
®
BRK LAMPC4/C5 Brake Lamps,
C6/C7/C8 Tractor/Trailer Wiring
DRL Daytime Running Lamps
IGN-4 Ignition
CHMSL Center High Mounted Stop Lamp
MRK LTS Sidemarker and Clearance Lamps
5-91

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.
Exhaust System Check
Be alert for any changes in the sound of the exhaust
system or any smell of fumes. These are signs the
system may be leaking. Have it checked and/or repaired
at once. Refer toEngine Exhaust on page 2-43and
Running the Engine While Parked on page 2-44.
Windshield Wipers and Washers Check
Check operation and condition of the wiper blades.
Check the flow of the washer spray.
Defroster Check
Move the control to the defrost symbol and the fan to HI
or the high symbol. Then check the airflow from the
ducts at the inside base of the windshield.
Mirrors and Sun Visors Check
Check that friction joints hold mirrors and sun visors
in place.
Seat Adjuster Check
When adjusting a manual seat, be sure seat adjusters
latch by attempting to move the seat after latching.
Lamps Check
Check panel lighting, warning lights, indicator lights, and
interior lamps. On the outside, check: license plate
lamps, sidemarker lamps, reflectors or lights on outside
mirrors, headlamps, parking lamps, identification and
clearance lamps, taillamps, brake lamps, turn signals,
backup lamps, and hazard warning flashers. Have
headlamp aim checked at once if beams seem
improperly aimed.
Glass, Mirrors, Lamps and/or
Re ectors Condition Check
Look for broken, scratched, dirty, or damaged glass,
mirrors, lamps, or reflectors that could reduce the view
or visibility or cause injury. Replace, clean or repair
promptly.
6-30

M
Maintenance, Normal Replacement Parts..........5-100
Maintenance Schedule
At Each Fuel Fill.........................................6-27
At Least Once a Year..................................6-31
At Least Twice a Year..................................6-28
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.............6-27
Part C - Recommended Fluids and
Lubricants...............................................6-32
Part D - Maintenance Record........................6-34
Scheduled Maintenance................................. 6-5
Scheduled Maintenance Supplements............... 6-5
Using.......................................................... 6-4
Your Vehicle and the Environment................... 6-2
Malfunction Indicator Light................................3-36
Manual Seats................................................... 1-2
Manual Transmission
Fluid..........................................................5-35
Operation...................................................2-29
Manual Windows.............................................. 2-8
Marker Lamps................................................3-16
Mirrors
Manual Rearview Mirror................................2-45
Outside Convex Mirrors................................2-46
Outside Heated Mirrors................................2-46Mirrors (cont.)
Outside Manual Mirrors................................2-45
Outside Power Mirrors..................................2-45
MyGMLink.com................................................ 7-3
N
New Vehicle Break-In......................................2-11
Noise Control System, Tampering......................5-64
Normal Maintenance Replacement Parts...........5-100
O
Odometer......................................................3-26
Odometer, Trip...............................................3-26
Off-Road Recovery..........................................4-13
Oil
Change Engine Oil Light...............................3-38
Engine...............................................5-22, 5-26
Low Oil Level Light......................................3-38
Pressure Gage............................................3-37
Oil, Engine Oil Life System..............5-29, 5-31, 5-32
Older Children, Restraints................................1-27
Online Owner Center........................................ 7-3
Other Service Items
Air Conditioning System...............................5-70
Automatic Ether Injection System...................5-68
Front Wheel Bearings with Oil-Filled Hubs.......5-69
Fuel Filter...................................................5-66
9

Other Service Items (cont.)
Primary Fuel Filter and Water Separator.........5-67
Secondary Fuel Filter and Water Separator/
Heater....................................................5-68
Other Warning Devices...................................... 3-6
Outlet Adjustment............................................3-23
Outside
Convex Mirrors............................................2-46
Heated Mirrors............................................2-46
Manual Mirrors............................................2-45
Power Mirrors.............................................2-45
Overspeed Warning Light.................................3-39
Owners, Canadian............................................... ii
P
Parking.........................................................2-38
Air Brake....................................................2-40
Hydraulic Brakes.........................................2-38
Over Things That Burn.................................2-43
Propshaft Brake Burnish Procedure................2-39
Part A - Scheduled Maintenance Services............ 6-4
Part B - Owner Checks and Services................6-27
Part C - Recommended Fluids and Lubricants....6-32
Part D - Maintenance Record...........................6-34
Passing.........................................................4-13Power
Accessory Outlets........................................3-19
Door Locks.................................................. 2-7
Electrical System.........................................5-89
Reduced Engine Light..................................3-41
Steering Fluid.............................................5-45
Windows...................................................... 2-9
Propshaft Brake Burnish Procedure...................2-39
Q
Questions and Answers About Safety Belts.........1-13
R
Radios..........................................................3-44
AM-FM Radio.............................................3-45
Care of Your Cassette Tape Player................3-58
Care of Your CD Player...............................3-59
Care of Your CDs........................................3-59
Radio with Cassette.....................................3-48
Radio with CD............................................3-53
Setting the Time..........................................3-45
Theft-Deterrent............................................3-57
Understanding Reception..............................3-57
Range Inhibit Warning Indicator........................3-31
10

Reading Lamps..............................................3-17
Rear Axle......................................................5-60
Differential Lock Control................................. 4-9
Shift Motor.................................................5-62
Two-Speed Electric Shift Control....................2-26
Rear Heating System......................................3-24
Rear Seat Operation......................................... 1-8
Rear Seat Passengers, Safety Belts..................1-24
Rearview Mirrors.............................................2-45
Reclining Seatbacks.......................................... 1-4
Reduced Engine Power Light............................3-41
Remote Keyless Entry System............................ 2-3
Remote Keyless Entry System, Operation............ 2-4
Reporting Safety Defects
Canadian Government................................... 7-7
General Motors............................................. 7-8
United States Government.............................. 7-7
Restraint System Check
Checking the Restraint Systems....................1-60
Replacing Restraint System Parts
After a Crash..........................................1-60
Right Front Passenger Position, Safety Belts......1-22
Roadside
Assistance Program....................................... 7-5
Rocking Your Vehicle to Get it Out....................4-30
Running Out of Fuel........................................5-15
Running the Engine While Parked.....................2-44S
Safety Belt
Reminder Light............................................3-27
Reminder Tone............................................3-27
Safety Belts
Care of......................................................5-82
Center Passenger Position............................1-22
Driver Position............................................1-14
How to Wear Safety Belts Properly................1-14
Questions and Answers About Safety Belts.....1-13
Rear Seat Passengers.................................1-24
Right Front Passenger Position......................1-22
Safety Belt Extender....................................1-26
Safety Belt Use During Pregnancy.................1-22
Safety Belts Are for Everyone......................... 1-9
Shoulder Belt Height Adjuster........................1-21
Safety Warnings and Symbols.............................. iii
Scheduled Maintenance..................................... 6-5
Scheduled Maintenance Supplements.................. 6-5
Seats
Air Suspension Seats.................................... 1-6
Manual........................................................ 1-2
Rear Seat Operation...................................... 1-8
Reclining Seatbacks...................................... 1-4
Split Bench Seat........................................... 1-6
11