GMC Sierra 1999 User manual

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The 1999 GMC Sierra Owner’s Manual
1-1 Seats and Restraint Systems
This section tells you how to use your seats and safety belts properly. It also explains the air bag system.
2-1 Features and Controls
This section explains how to start and operate your vehicle.
3-1 Comfort Controls and Audio Systems
This section tells you how to adjust the ventilation and comfort controls and how to operate your audio system.
4-1 Your Driving and the Road
Here you’ll find helpful information and tips about the road and how to drive under different conditions.
5-1 Problems on the Road
This section tells you what to do if you have a problem while driving, such as a flat tire or overheated engine, etc.
6-1 Service and Appearance Care
Here the manual tells you how to keep your vehicle running properly and looking good.
7-1 Maintenance Schedule
This section tells you when to perform vehicle maintenance and what fluids and lubricants to use.
8-1 Customer Assistance Information
This section tells you how to contact GMC for assistance and how to get service and owner publications.
It also gives you information on “Reporting Safety Defects” on page 8-10.
9-1 Index
Here’s an alphabetical listing of almost every subject in this manual. You can use it to quickly find
something you want to read.

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GENERAL MOTORS, GM, the GM Emblem, GMC,
the GMC Emblem and the name SIERRA are registered
trademarks of General Motors Corporation.
This manual includes the latest information at the time
it was printed. We reserve the right to make changes
in the product after that time without further notice.
For vehicles first sold in Canada, substitute the name
“General Motors of Canada Limited” for GMC
whenever it appears in this manual.
Please keep this manual in your vehicle, so it will be
there if you ever need it when you’re on the road. If you
sell the vehicle, please leave this manual in it so the new
owner can use it.
We support voluntary
technician certification.
For Canadian Owners Who Prefer a
French Language Manual:
Aux propriétaires canadiens: Vous pouvez vous
procurer un exemplaire de ce guide en français chez
votre concessionaire ou au:
DGN Marketing Services Ltd.
1577 Meyerside Dr.
Mississauga, Ontario L5T 1B9
Litho in U.S.A.
E
Copyright General Motors Corporation 1998
X9915 B First Edition All Rights Reserved

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How to Use this Manual
Many people read their owner’s manual from beginning
to end when they first receive their new vehicle. If you
do this, it will help you learn about the features and
controls for your vehicle. In this manual, you’ll find
that pictures and words work together to explain
things quickly.
Index
A good place to look for what you need is the Index in
back of the manual. It’s an alphabetical list of what’s in
the manual, and the page number where you’ll find it.
Safety Warnings and Symbols
You will find a number of safety cautions in this book.
We use a box and the word CAUTION to tell you
about things that could hurt you if you were to ignore
the warning.
CAUTION:
These mean there is something that could hurt
you or other people.
In the caution area, we tell you what the hazard is. Then
we tell you what to do to help avoid or reduce the
hazard. Please read these cautions. If you don’t, you or
others could be hurt.

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You will also find a circle
with a slash through it in
this book. This safety
symbol means “Don’t,”
“Don’t do this” or “Don’t
let this happen.”
Vehicle Damage Warnings
Also, in this book you will find these notices:
NOTICE:
These mean there is something that could
damage your vehicle.
In the notice area, we tell you about something that can
damage your vehicle. Many times, this damage would
not be covered by your warranty, and it could be costly.
But the notice will tell you what to do to help avoid
the damage.
When you read other manuals, you might see
CAUTION and NOTICE warnings in different colors or
in different words.
You’ll also see warning labels on your vehicle. They use
the same words, CAUTION or NOTICE.

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For example,
these symbols
are used on an
original battery:
CAUTION
POSSIBLE
INJURY
PROTECT
EYES BY
SHIELDING
CAUSTIC
BATTERY
ACID COULD
CAUSE
BURNS
AVOID
SPARKS OR
FLAMES
SPARK OR
FLAME
COULD
EXPLODE
BATTERY
These symbols
are important
for you and
your passengers
whenever your
vehicle is
driven:
DOOR LOCK
UNLOCK
FASTEN
SEAT
BELTS
POWER
WINDOW
AIR BAG
These symbols
have to do with
your lamps:
MASTER
LIGHTING
SWITCH
TURN
SIGNALS
PARKING
LAMPS
HAZARD
WARNING
FLASHER
DAYTIME
RUNNING
LAMPS
FOG LAMPS
These symbols
are on some of
your controls:
WINDSHIELD
WIPER
WINDSHIELD
WASHER
WINDSHIELD
DEFROSTER
REAR
WINDOW
DEFOGGER
VENTILATING
FAN
These symbols
are used on
warning and
indicator lights:
ENGINE
COOLANT
TEMP
BATTERY
CHARGING
SYSTEM
BRAKE
COOLANT
ENGINE OIL
PRESSURE
ANTI-LOCK
BRAKES
Here are some
other symbols
you may see:
FUSE
LIGHTER
HORN
SPEAKER
FUEL
Vehicle Symbols
These are some of the symbols you may find on your vehicle.

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Model Reference
This manual covers these models:
Regular Cab Pickup
Extended Cab Pickup
Chassis Cab

1-
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1-1
Section 1 Seats and Restraint Systems
Here you’ll find information about the seats in your vehicle and how to use your safety belts properly. You can also
learn about some things you should not do with air bags and safety belts.
1-2 Seats and Seat Controls
1-12 Safety Belts: They’re for Everyone
1-16 Here Are Questions Many People Ask
About Safety Belts -- and the Answers
1-17 How to Wear Safety Belts Properly
1-18 Driver Position
1-24 Safety Belt Use During Pregnancy
1-25 Right Front Passenger Position
1-25 Air Bag System
1-36 Center Passenger Position
1-37 Rear Seat Passengers
1-41 Rear Safety Belt Comfort Guides for
Children and Small Adults
1-43 Children
1-46 Child Restraints
1-63 Larger Children
1-66 Safety Belt Extender
1-66 Checking Your Restraint Systems
1-66 Replacing Restraint System Parts
After a Crash

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1-2
Seats and Seat Controls
This section tells you about the seats -- how to adjust
them, and fold them up and down. It also tells you about
reclining front seatbacks and head restraints.
Manual Front Seat
CAUTION:
You can lose control of the vehicle if you try to
adjust a manual driver’s seat while the vehicle is
moving. The sudden movement could startle and
confuse you, or make you push a pedal when you
don’t want to. Adjust the driver’s seat only when
the vehicle is not moving.
If your vehicle has a manual bucket or split bench seat,
you can adjust it with this lever located at the front of
the seat.
Lift the lever at the front of the seat to unlock it. Using
your body, slide the seat to where you want it. Then,
release the lever and try to move the seat with your body
in order to make sure the seat is locked into place.

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1-3
Cushion Tilt (If Equipped)
If your vehicle has this feature, you can raise or lower
the front of the driver’s or passenger’s seat with this
lever located at the inside edge of the seat. To raise or
lower the front of the seat, move the lever up or down in
a continuous motion until the cushion reaches the
desired height.
Manual Lumbar Control (If Equipped)
If your vehicle has a lumbar
adjustment, you can
increase or decrease lumbar
support in an area of the
lower seatback.
To increase support, turn the knob towards the front of
the vehicle.
To decrease support, turn the knob towards the rear of
the vehicle.

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1-4
Power Seat(s) (If Equipped)
Horizontal Control: If your vehicle has a power seat,
you can adjust it with this control located at the outside
edge of the seat.
Raise the front of the seat cushion by raising the forward
edge of the button. Lower the front of the seat cushion
by lowering the forward edge of the button. Move the
seat forward by moving the whole button toward the
front of the vehicle.
Raise the rear of the seat cushion by raising the rear
edge of the button. Lower the rear of the seat cushion by
lowering the rear edge of the button. Move the seat
rearward by moving the whole button toward the rear of
the vehicle.
Moving the whole button up or down raises or lowers
the entire seat cushion.
Vertical Control: If your vehicle has the power
reclining seats, you can use this button to adjust the
angle of the seatback. Move the reclining front seatback
rearward by moving the button toward the rear of the
vehicle. Move the seatback forward by moving the
button toward the front of the vehicle. See “Reclining
Seatbacks” in the Index for further information.