Page 7 of 374

Front Seats......................................................1-2
Manual Seats................................................1-2
Reclining Seatbacks........................................1-4
Split Bench Seat (80/20 Split)..........................1-6
Air Suspension Seats......................................1-6
Rear Seats.......................................................1-8
Rear Seat Operation.......................................1-8
Safety Belts.....................................................1-9
Safety Belts: They Are for Everyone.................1-9
Questions and Answers About Safety Belts......1-13
How to Wear Safety Belts Properly.................1-14
Driver Position..............................................1-14
Shoulder Belt Height Adjustment.....................1-21
Safety Belt Use During Pregnancy..................1-22
Right Front Passenger Position.......................1-22
Center Passenger Position.............................1-22
Rear Seat Passengers..................................1-24
Safety Belt Extender.....................................1-26
Child Restraints.............................................1-27
Older Children..............................................1-27
Infants and Young Children............................1-30
Child Restraint Systems.................................1-33
Where to Put the Restraint
(Regular Cab Models)................................1-36Where to Put the Restraint
(Crew Cab Models)....................................1-38
Top Strap....................................................1-39
Securing a Child Restraint in a Rear Outside
Seat Position (Crew Cab Models)................1-40
Securing a Child Restraint in the Center
Rear Seat Position (Crew Cab) or Center
Front Position...........................................1-42
Securing a Child Restraint in the Right Front
Seat Position............................................1-44
Airbag System...............................................1-48
Where Are the Airbags?................................1-52
When Should an Airbag Inflate?.....................1-53
What Makes an Airbag Inflate?.......................1-54
How Does an Airbag Restrain?.......................1-54
What Will You See After an Airbag Inflates?.....1-54
Airbag Off Switch..........................................1-56
Servicing Your Airbag-Equipped Vehicle...........1-59
Adding Equipment to Your Airbag-Equipped
Vehicle....................................................1-59
Restraint System Check..................................1-60
Checking the Restraint Systems......................1-60
Replacing Restraint System Parts
After a Crash............................................1-60
Section 1 Seats and Restraint Systems
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{CAUTION:
If the seatback is not locked, it could move
forward in a sudden stop or crash. That could
cause injury to the person sitting there. Always
press rearward on the seatback to be sure it
is locked.
Lumbar Adjustments
The lumbar adjustment
knob is located on the
seatback, on the inboard
side of the driver’s seat and
on the outboard side of the
passenger’s seat.
For more support to your lower back, turn the lumbar
adjustment knob clockwise. To decrease the amount of
lumbar support, turn the knob counterclockwise.
Seatback Adjustment
The seatback adjustment
knob is located on the
inboard side of the
driver’s and passenger’s
seat cushions.
To tilt the seatback rearward, turn the knob
counterclockwise. Turn the knob clockwise to tilt the
seat forward.
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Fore-and-Aft Adjustment
The fore-and-aft
adjustment lever is
located underneath the
seat, in the front.
To slide the seat forward or rearward, move the lever
toward the driver’s door. The seat will lock in at 1/2 inch
(1.5 cm) increments.
{CAUTION:
If the seatback is not locked, it could move
forward in a sudden stop or crash. That could
cause injury to the person sitting there. Always
press rearward on the seatback to be sure it
is locked.
Reclining Seatbacks
If your vehicle has non-suspension bucket seats, you
can recline the seatbacks. The lever is located on
the outboard side of the seat cushion.
To recline the seatback, lift the lever and use your body
to move the seatback. Release the lever to lock the
seatback where you want it. Lean forward and pull up on
the lever to return the seatback to an upright position.
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Page 12 of 374
Split Bench Seat (80/20 Split)
If your vehicle has a split bench seat, your seat is
not adjustable.
There is a storage area underneath the seat cushion.
SeeStorage Areas on page 2-47.
Air Suspension Seats
Your vehicle may have a low-back or high-back air
suspension seat. There are two ways you can adjust
the seat.
Height Adjustment
The suspension seat
height adjustment lever
is located on the front
inboard side of the seat.
To adjust the height of the air suspension seat, pull the
lever up to inflate. Push the lever down to deflate.
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The seat cushion can also be raised or lowered.
The seat cushion height
adjustment handle is
located underneath the
front of the seat.
To adjust the height of the cushion, lift the handle up and
pull it forward. You can choose between two settings.Chugger-Snubber Lock-Out Feature
If your vehicle has this
feature, the handle is
located on the outboard
side of the driver’s
and passenger’s seats.
Move the handle down to reduce any backslap
experienced while in tractor/trailer operation or while
operating a dump truck application.
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Page 32 of 374

Each position next to the windows has a shoulder belt
height adjuster. SeeShoulder Belt Height Adjustment on
page 1-21.
{CAUTION:
You can be seriously hurt if your shoulder belt
is too loose. In a crash, you would move
forward too much, which could increase injury.
The shoulder belt should t against your body.
To unlatch the belt, just push the button on the buckle.
Safety Belt Extender
If the vehicle’s safety belt will fasten around you,
you should use it.
But if a safety belt is not long enough, your dealer will
order you an extender. It is free. When you go in to
order it, take the heaviest coat you will wear, so
the extender will be long enough for you. To help avoid
personal injury, do not let someone else use it, and
use it only for the seat it is made to fit. The extender has
been designed for adults. Never use it for securing
child seats. To wear it, just attach it to the regular safety
belt. For more information, see the instruction sheet
that comes with the extender.
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Page 137 of 374

The rear window defogger will turn off several minutes
after the button is pressed. The defogger can also
be turned off by pressing the button again or by turning
off the engine.
Notice:Do not use anything sharp on the inside of
the rear window. If you do, you could cut or
damage the warming grid, and the repairs would not
be covered by your warranty. Do not attach a
temporary vehicle license, tape, a decal or anything
similar to the defogger grid.
Outlet Adjustment
Your vehicle has air outlets on the instrument panel that
allow you to adjust the direction and amount of airflow
inside the vehicle.
Move the lever on the outlet up or down to direct the
airflow. Increase or reduce the amount of airflow
by opening and closing the louvers. The outlets can be
moved side-to-side to direct the airflow.
Operation Tips
•
Keep the hood and front air inlets free of ice, snow,
or any other obstruction (such as leaves). The
heater and defroster will work far better, reducing
the chance of fogging the inside of your windows.
•Keep the air path under the front seats clear
of objects. This helps air to circulate throughout your
vehicle.
•Adding outside equipment to the front of your
vehicle, such as hood-air deflectors, may affect the
performance of the heating and air conditioning
system. Check with your dealer before adding
equipment to the outside of your vehicle.
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Page 263 of 374

Electric Air Compressor
Your vehicle may have an electric air compressor. This
compressor is used to run options that require
pressurized air, such as air horn, air seat, 7.8L engine
exhaust restrictor, or 7.8L engine exhaust brake.
The air compressor is used when vehicles are not
equipped with an air brake system.
The air supply for this
system must be
maintained by releasing
the drain valve to eject any
moisture that may have
built up in the system.
It is recommended that this system be drained on a
weekly basis.
Clutch Pedal Free Travel
If you have a V8 engine and a manual transmission,
your clutch will need adjustment when pedal free travel
gets down to about 1/4 inch (32 mm), as measured
at the clutch pedal pad. You should have 1 1/2 to
2 inches (38 to 51 mm) of clutch pedal free travel.
If your clutch ever needs service, be sure to use only
GM clutch replacement parts.
Chassis Lubrication
Your Maintenance Schedule provides all of the required
chassis lubrication intervals and identifies proper
lubricants to use. Be sure to see your Maintenance
Schedule before performing any chassis lubrication
service. To determine location of chassis lubrication
items, use the following charts.
5-51