1999 CHEVROLET SILVERADO ECU

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5-31 Storing a Flat or Spare Tire and Tools
CAUTION:
Storing a jack, a tire or other equipment in the
passenger compartment of the vehicle could
cause injury. In a sudden stop or collision, loose
equipment could strike someone. Store all these
in the proper place.
Store the flat tire where the spare tire was stored.
Store the tire under the rear of the vehicle in the spare
tire carrier. To store the tire:
1. Put the tire on the ground at the rear of the
vehicle with the valve stem pointed downward and
to the rear.
2. Tilt the retainer downward and through the wheel
opening. Make sure that the retainer is fully seated
across the underside of the wheel.
3. Attach the wheel wrench and extensions together.
Insert the hoist end through the hole in the rear
bumper and into the hoist shaft.
4. Raise the tire part of the way upward. When the tire
is almost in the stored position, adjust the tire so that
the valve stem is toward the rear of the vehicle.
5. Raise the tire fully against the underside of the
vehicle. Continue turning the wrench until there are
two ªclicksº or ªratchets.º The spare tire hoist
cannot be over
-tightened.
6. Grasp and push against the tire to be sure it is stored
securely and does not move.
7. Replace the jack, tools and spare tire lock.

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5-32
A. Hoist Assembly
B. Wheel Wrench
C. Extensions
D. Hoist Shaft
E. Valve Stem, Pointed Down
F. Flat or Spare Tire
G. Retainer
H. Hoist Cable
Return the bottle jack, wheel blocks, wheel wrench and
jack extensions to their location behind the passenger's
seat. Secure the items in the vehicle as shown.A. Wing Nut
B. Wheel Blocks
C. Wheel Wrench and Extensions Retainer
D. Gloves
E. Wheel Wrench and Extensions
F. Storage Bag
G. Bottle Jack Holder
H. Bottle Jack
I. Wheel Block Retainer

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6-53 Tire Chains
NOTICE:
If your vehicle has P265/75R16 or LT265/75R16
size tires, don't use tire chains. They can
damage your vehicle because there's not
enough clearance.
Use another type of traction device only if its
manufacturer recommends it for use on your
vehicle and tire size combination and road
conditions. Follow that manufacturer's
instructions. To help avoid damage to your
vehicle, drive slowly, readjust or remove the
device if it's contacting your vehicle, and don't
spin your wheels.
If you do find traction devices that will fit, install
them on the rear tires.
NOTICE: (Continued)
NOTICE: (Continued)
If you have a tire size other than P265/75R16 or
LT265/75R16, use tire chains only where legal
and only when you must. Use chains that are the
proper size for your tires. Install them on the
tires of the rear axle.
Don't use chains on the tires of the front axle.
Tighten them as tightly as possible with the ends
securely fastened. Drive slowly and follow the
chain manufacturer's instructions. If you can
hear the chains contacting your vehicle, stop
and retighten them. If the contact continues,
slow down until it stops. Driving too fast or
spinning the wheels with chains on will damage
your vehicle.

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9-2
Before Leaving on a Long Trip 4-37 . . . . . . . . . . . . . . . . . . . .
Better Business Bureau Mediation 8-3 . . . . . . . . . . . . . . . . . . .
Blizzard, Driving In 4-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake
Adjustment 6
-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 6-34, 7-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Master Cylinder 6-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking 2-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pedal Travel 6-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing System Parts 6-37 . . . . . . . . . . . . . . . . . . . . . . . .
System Warning Light 2-74 . . . . . . . . . . . . . . . . . . . . . . . . .
Trailer 4-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Shift Interlock Check 7-21 . . . . . . . . . . . . . . .
Wear 6-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brakes, Anti-Lock 4-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking 4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking in Emergencies 4-9 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Break-In, New Vehicle 2-13 . . . . . . . . . . . . . . . . . . . . . . . . . .
BTSI Check 7-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb Replacement 6-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Camper Type Mirror 2-59 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Camper Wiring Harness 4-52 . . . . . . . . . . . . . . . . . . . . . . . . . .
Canadian Roadside Assistance 8-7 . . . . . . . . . . . . . . . . . . . . . .
Capacities and Specifications 6-74 . . . . . . . . . . . . . . . . . . . . . .
Carbon Monoxide 2-39, 2-40, 4-43 . . . . . . . . . . . . . . . . . . . .
Care of Your Cassette Tape Player 3-27 . . . . . . . . . . . . . . . . . .
Cargo
Lamp 2
-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lamp Bulb Replacement 6-41 . . . . . . . . . . . . . . . . . . . . . . .
Lamp On Message 2-87 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cassette Deck Service 7-18 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cassette Tape Player 3-11, 3-13 . . . . . . . . . . . . . . . . . . . . . . . Cassette Tape Player Care 3
-27 . . . . . . . . . . . . . . . . . . . . . . . .
Cassette/Compact Disc Storage 2-63, 2-64 . . . . . . . . . . . . . . .
Cellular Telephone 2-65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Center High-Mounted Stoplamp Bulb Replacement 6-41 . . . .
Center Overhead Console 2-60 . . . . . . . . . . . . . . . . . . . . . . . .
Center Passenger Position 1-36 . . . . . . . . . . . . . . . . . . . . . . . .
Certification Label 4-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Certification/Tire Label 4-46 . . . . . . . . . . . . . . . . . . . . . . . . . .
Chains, Safety 4-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chains, Tire 6-53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Change Engine Oil Message 2-86 . . . . . . . . . . . . . . . . . . . . . .
Changing a Flat Tire 5-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Coolant Temp Message 2-84 . . . . . . . . . . . . . . . . . . . . .
Check Eng Oil Level Message 2-85, 6-12 . . . . . . . . . . . . . . . .
Check Eng Oil Pressure Message 2-85 . . . . . . . . . . . . . . . . . .
Checking Transmission Fluid 6-22 . . . . . . . . . . . . . . . . . . . . .
Checking Your Restraint Systems 1-66 . . . . . . . . . . . . . . . . . .
Chemical Paint Spotting 6-61 . . . . . . . . . . . . . . . . . . . . . . . . . .
Child Restraints 1-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Securing in a Rear Outside Seat Position 1-54 . . . . . . . . . . .
Securing in the Center Seat Position 1-56 . . . . . . . . . . . . . .
Securing in the Right Front Seat Position 1-58 . . . . . . . . . .
Top Strap 1-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Where to Put 1-50, 1-51 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chrome Wheels, Cleaning 6-59 . . . . . . . . . . . . . . . . . . . . . . . .
Cigarette Lighter 2-64 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Breakers and Fuses 6-65 . . . . . . . . . . . . . . . . . . . . . . .
Cleaner, Air 6-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning
Aluminum Wheels 6
-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exterior Lamps/Lenses 6-58 . . . . . . . . . . . . . . . . . . . . . . . .
Fabric 6-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glass Surfaces 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-7
Maintenance, Normal Replacement Parts 6-77 . . . . . . . . . . .
Maintenance Record 7-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Schedule 7-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Owner Checks and Services 7-18 . . . . . . . . . . . . . . . . . . . . .
Periodic Maintenance Inspections 7-23 . . . . . . . . . . . . . . . .
Recommended Fluids and Lubricants 7-25 . . . . . . . . . . . . .
Scheduled Maintenance Services 7-4 . . . . . . . . . . . . . . . . . .
Maintenance Services 7-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance, Underbody 6-61 . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance When Trailer Towing 4-64 . . . . . . . . . . . . . . . . .
Malfunction Indicator Lamp 2-77 . . . . . . . . . . . . . . . . . . . . . .
Manual Front Seat 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Mirror 2-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Selectable Ride 2-41 . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Transmission
Check 7
-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 6-22, 7-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shifting 2-24, 2-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting Your Engine 2-16 . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Windows 2-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Seat 1-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Message Center 2-82 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Messages
Battery 2
-82 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cargo Lamp On 2-87 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Change Engine Oil 2-86 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Coolant Temp 2-84 . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Eng Oil Level 2-85 . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Eng Oil Pressure 2-85 . . . . . . . . . . . . . . . . . . . . . . . .
Engine Overheated 2-85 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Coolant 2-84 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Fuel 2-87 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low Washer Fluid 2
-87 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reduced Engine Power 2-85 . . . . . . . . . . . . . . . . . . . . . . . .
Security 2-86 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service 4WD 2-86 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trans Fluid Hot 2-82 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Methanol 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mirrors 2-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Camper Type 2-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convex Outside 2-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrochromic Day/Night Rearview 2-56 . . . . . . . . . . . . . .
Heated Outside Rearview 2-59, 3-6 . . . . . . . . . . . . . . . . . . .
Inside Day/Night Rearview 2-56 . . . . . . . . . . . . . . . . . . . . .
Manual 2-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Remote Control 2-59 . . . . . . . . . . . . . . . . . . . . . . . . .
MMT 6-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Reference vi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mountain Roads 4
-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
New Vehicle Break-In 2-13 . . . . . . . . . . . . . . . . . . . . . . . . . .
Night Vision 4-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Normal Maintenance, Normal Replacement Parts 6-77 . . . . . .
Odometer 2-69 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Odometer, Trip 2-69 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Off-Road Driving 4-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Off-Road Recovery 4-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil, Engine 6-12, 7-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Filter 6-77 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Life Monitor 6-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OnStar
System 2-65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Opener, Garage Door 2-61 . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-9
Reserve Capacity, Front Axle 4-49 . . . . . . . . . . . . . . . . . . . . .
Reserve Capacity, Total Vehicle 4-49 . . . . . . . . . . . . . . . . . . . .
Restraints
Checking 1
-66 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Child 1-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Head 1-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing Parts After a Crash 1-66 . . . . . . . . . . . . . . . . . . .
System Check 7-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Retained Accessory Power 2-16 . . . . . . . . . . . . . . . . . . . . . . . .
Right Front Passenger Position 1-25 . . . . . . . . . . . . . . . . . . . .
Roadside Assistance 8-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Roadside Assistance, Canadian 8-7 . . . . . . . . . . . . . . . . . . . . .
Rocking Your Vehicle 5-33 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Roof, Auxiliary Mounted Lamp Switch 2-54 . . . . . . . . . . . . .
Rotation, Tires 6-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Belt Extender 1-66 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Belts 1-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adults 1-17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Care 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Center Passenger Position 1-36 . . . . . . . . . . . . . . . . . . . . . .
Children 1-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver Position 1-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Extender 1-66 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Wear Properly 1-17 . . . . . . . . . . . . . . . . . . . . . . . . .
Incorrect Usage 1-20, 1-64, 1-65 . . . . . . . . . . . . . . . . . . . .
Lap Belt 1-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Larger Children 1-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Passenger Position 1-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Questions and Answers 1-16 . . . . . . . . . . . . . . . . . . . . . . . .
Rear Comfort Guides 1-41 . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Seat Outside Passenger Positions 1-38 . . . . . . . . . . . .
Rear Seat Passengers 1-37 . . . . . . . . . . . . . . . . . . . . . . . . . .
Reminder Light 1-12, 2-70 . . . . . . . . . . . . . . . . . . . . . . . . . Replacing After a Crash 1
-66 . . . . . . . . . . . . . . . . . . . . . . . .
Right Front Passenger Position 1-25 . . . . . . . . . . . . . . . . . .
Smaller Children and Babies 1-43 . . . . . . . . . . . . . . . . . . . .
Use During Pregnancy 1-24 . . . . . . . . . . . . . . . . . . . . . . . . .
Why They Work 1-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Chains 4-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Defects, Reporting 8-10 . . . . . . . . . . . . . . . . . . . . . . . .
Safety Warnings and Symbols iii. . . . . . . . . . . . . . . . . . . . . . .
Scheduled Maintenance Services 7
-4 . . . . . . . . . . . . . . . . . . . .
Seatback, Latches 1-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seatbacks, Reclining 1-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seats
Easy Entry 1
-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heated Front 1-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Front 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory 1-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power 1-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Lumbar Control 1-3 . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear 1-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Restraint Systems 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seat Controls 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Securing a Child Restraint 1-54, 1-56, 1-58 . . . . . . . . . . . .
Security Message 2-86 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service 6-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulletins, Ordering 8-11, 8-12 . . . . . . . . . . . . . . . . . . . . . . .
Engine Soon Light 2-77 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manuals, Ordering 8-11, 8-12 . . . . . . . . . . . . . . . . . . . . . . .
Parts Identification Label 6-63 . . . . . . . . . . . . . . . . . . . . . . .
Publications, Ordering 8-11, 8-12 . . . . . . . . . . . . . . . . . . . .
Work, Doing Your Own 6-2 . . . . . . . . . . . . . . . . . . . . . . . . .
Service 4WD Message 2-86 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service and Appearance Care 6-1 . . . . . . . . . . . . . . . . . . . . . .
Service and Owner Publications 8-11, 8-12 . . . . . . . . . . . . . .
Service Publications 8-11, 8-12 . . . . . . . . . . . . . . . . . . . . . . . .