1999 CHEVROLET CORVETTE ECU

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3-27 Theft-Deterrent Feature
THEFTLOCK
is designed to discourage theft of your
radio. It works by using a secret code to disable all radio
functions whenever battery power is removed.
The THEFTLOCK feature for the radio may be used or
ignored. If ignored, the system plays normally and the
radio is not protected by the feature. If THEFTLOCK is
activated, your radio will not operate if stolen.
When THEFTLOCK is activated, the radio will display
LOC to indicate a locked condition anytime battery
power has been interrupted. If your battery loses power
for any reason, you must unlock the radio with the secret
code before it will operate.
Activating the Theft
-Deterrent Feature
The instructions which follow explain how to enter your
secret code to activate the THEFTLOCK system. It is
recommended that you read through all nine steps
before starting the procedure.
NOTE: If you allow more than 15 seconds to elapse
between any steps, the radio automatically reverts to
time and you must start the procedure over at Step 4.1. Write down any three or four
-digit number from
000 to 1999 and keep it in a safe place separate from
the vehicle.
2. Turn the ignition to ACC or ON.
3. Turn the radio off.
4. Press the 1 and 4 buttons together. Hold them down
until
--- shows on the display. Next you will use the
secret code number which you have written down.
5. Press MN and 000 will appear on the display.
6. Press MN again to make the last two digits agree
with your code.
7. Press HR to make the first one or two digits agree
with your code.
8. Press AM
-FM after you have confirmed that the
code matches the secret code you have written down.
The display will show REP to let you know that you
need to repeat Steps 5 through 7 to confirm your
secret code.
9. Press AM
-FM and this time the display will show
SEC to let you know that your radio is secure. The
LED indicator by the volume control will begin
flashing when the ignition is turned off.

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3-28
Unlocking the Theft-Deterrent Feature After a
Power Loss
Enter your secret code as follows; pause no more than
15 seconds between steps:
1. Turn the ignition on. LOC will appear on the display.
2. Press MN and 000 will appear on the display.
3. Press MN again to make the last two digits agree
with your code.
4. Press HR to make the first one or two digits agree
with your code.
5. Press AM
-FM after you have confirmed that the
code matches the secret code you have written down.
The display will show SEC, indicating the radio is
now operable and secure.
If you enter the wrong code eight times, INOP will
appear on the display. You will have to wait an hour
with the ignition on before you can try again. When you
try again, you will only have three chances to enter the
correct code before INOP appears.
If you lose or forget your code, contact your dealer.
Disabling the Theft
-Deterrent Feature
Enter your secret code as follows; pause no more than
15 seconds between steps:1. Turn the ignition to ACC or ON.
2. Turn the radio off.
3. Press the 1 and 4 buttons together. Hold them down
until SEC shows on the display.
4. Press MN and 000 will appear on the display.
5. Press MN again to make the last two digits agree
with your code.
6. Press HR to make the first one or two digits agree
with your code.
7. Press AM
-FM after you have confirmed that the
code matches the secret code you have written down.
The display will show
---, indicating that the radio is
no longer secured.
If the code entered is incorrect, SEC will appear on the
display. The radio will remain secured until the correct
code is entered.
When battery power is removed and later applied to a
secured radio, the radio won't turn on and LOC will
appear on the display.
To unlock a secured radio, see ªUnlocking the
Theft
-Deterrent Feature After a Power Lossº earlier in
this section.

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4-26
Winter Driving
Here are some tips for winter driving:

Have your vehicle in good shape for winter.

You may want to put winter emergency supplies in
your vehicle.
Include an ice scraper, a small brush or broom, a supply
of windshield washer fluid, a rag, some winter outer
clothing, a small shovel, a flashlight, a red cloth and a
couple of reflective warning triangles. And, if you will
be driving under severe conditions, include a small bag
of sand, a piece of old carpet or a couple of burlap bags
to help provide traction. Be sure you properly secure
these items in your vehicle.

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4-32
CAUTION:
Do not load your vehicle any heavier than the
GVWR, or either the maximum front or rear
GAWR. If you do, parts on your vehicle can
break, and it can change the way your vehicle
handles. These could cause you to lose control
and crash. Also, overloading can shorten the life
of your vehicle.
NOTICE:
Your warranty does not cover parts or
components that fail because of overloading.
If you put things inside your vehicle -- like suitcases,
tools, packages or anything else
-- they will go as fast as
the vehicle goes. If you have to stop or turn quickly, or
if there is a crash, they'll keep going.
CAUTION:
Things you put inside your vehicle can strike and
injure people in a sudden stop or turn, or in
a crash.

Put things in the rear area of your vehicle.
Try to spread the weight evenly.

Never stack heavier things, like suitcases,
inside the vehicle so that some of them are
above the tops of the seats.

Don't leave an unsecured child restraint in
your vehicle.

When you carry something inside the
vehicle, secure it whenever you can.
Towing A Trailer
Your Corvette is neither designed nor intended to tow
a trailer.

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5-8
Towing Your Vehicle
CAUTION:
To help avoid serious personal injury to you
or others:

Never let passengers ride in a vehicle that is
being towed.

Never tow faster than safe or posted speeds.

Never tow with damaged parts not
fully secured.

Never get under your vehicle after it has
been lifted by the tow truck.

Always secure the vehicle on each side with
separate safety chains when towing it.

Use only the correct hooks.
NOTICE:
Use the proper towing equipment to avoid
damage to the bumper, fascia or fog lamp areas
of the vehicle.
With current trends in automotive styles and design, it is
essential that the correct towing equipment is used to
tow a vehicle. Your vehicle can be towed with wheel
-lift
or car
-carrier equipment.
Consult your dealer or a professional towing service if
you need to have your vehicle towed. See ªRoadside
Assistanceº in the Index.
Engine Overheating
You will find an engine coolant temperature gage on the
instrument cluster and a COOLANT OVER TEMP
message on the Driver Information Center (DIC).
Overheated Engine Protection
Operating Mode
Should an overheated engine condition exist and the
messages COOLANT OVER TEMP and REDUCED
ENGINE POWER are displayed, along with the Check
Engine light, an overheat protection mode which
alternates firing groups of cylinders helps prevent
engine damage. In this mode, you will notice a loss in
power and engine performance. This operating mode
allows your vehicle to be driven to a safe place in an
emergency; you may drive up to 50 miles (80 km).

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6-58 Cleaning the Top of the Instrument Panel
Use only mild soap and water to clean the top surfaces
of the instrument panel. Sprays containing silicones or
waxes may cause annoying reflections in the windshield
and even make it difficult to see through the windshield
under certain conditions.
Cleaning Interior Plastic Components
Use only a mild soap and water solution on a soft c
loth or sponge. Commercial cleaners may affect the
surface finish.
Cleaning Soft-Touch Paint Surfaces
Use only mild soap and water to clean the Soft-Touch
paint surfaces.
Cleaning the Security Shade and
Convenience Net
Wash with warm water and mild detergent, rinse with
cold water and tumble dry on low. Do not use
chlorine bleach.
Care of Safety Belts
Keep belts clean and dry.
CAUTION:
Do not bleach or dye safety belts. If you do, it
may severely weaken them. In a crash, they
might not be able to provide adequate protection.
Clean safety belts only with mild soap and
lukewarm water.
Cleaning Glass Surfaces
Glass should be cleaned often. GM Glass Cleaner or a
liquid household glass cleaner will remove normal
tobacco smoke and dust films on interior glass. (See
ªAppearance Care and Materialsº in the Index.)
Don't use abrasive cleaners on glass, because they may
cause scratches. Avoid placing decals on the inside rear
window, since they may have to be scraped off later. If
abrasive cleaners are used on the inside of the rear
window, an electric defogger element may be damaged.
Any temporary license should not be attached across the
defogger grid.

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9-2
Back-Up Lamp Bulb Replacement 6-38 . . . . . . . . . . . . . . . .
Battery 6-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jump Starting 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement, Remote Function Actuation (RFA)
System 2
-12, 2-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warnings 5-3, 5-4, 5-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BBB 8-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Belt, Engine Accessory 6-77 . . . . . . . . . . . . . . . . . . . . . . . . . .
Blizzard 4-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake
Adjustment 6
-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking Fluid 6-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 6-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Master Cylinder 6-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking 2-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pedal Travel 6-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing System Parts 6-32 . . . . . . . . . . . . . . . . . . . . . . . .
System Warning Light 2-79 . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Shift Interlock (BTSI) 2-28, 2-37 . . . . . . . . .
Transmission Shift Interlock Check 7-15 . . . . . . . . . . . . . . .
Wear 6-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What to Add 6-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brakes, Anti-Lock 4-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking 4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking in Emergencies 4-12 . . . . . . . . . . . . . . . . . . . . . . . . . .
Break-In, New Vehicle 2-20 . . . . . . . . . . . . . . . . . . . . . . . . . .
BTSI 2-28, 2-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BTSI Check 7-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb Replacement 6-33, 6-74 . . . . . . . . . . . . . . . . . . . . . . . . .
Canada, Ordering Service and Owner Publications 8-11 . . .
Canadian Roadside Assistance 8-7 . . . . . . . . . . . . . . . . . . . . . .
Capacities and Specifications 6-74 . . . . . . . . . . . . . . . . . . . . . . Carbon Monoxide 2
-16, 2-38, 4-30 . . . . . . . . . . . . . . . . . . . .
Care of Your Cassette Tape Player 3-30 . . . . . . . . . . . . . . . . . .
Cassette
Deck Service 7
-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tape Player 3-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CD Adapter Kits 3-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Center Console Storage 2-56 . . . . . . . . . . . . . . . . . . . . . . . . . .
Certification Label 4-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chains, Tire 6-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Gages Light 2-86 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking Your Restraint Systems 1-39 . . . . . . . . . . . . . . . . . .
Chemical Paint Spotting 6-63 . . . . . . . . . . . . . . . . . . . . . . . . . .
Child Restraints 1-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Add-on 1-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Securing in the Passenger Seat Position 1-33 . . . . . . . . . . .
Top Strap 1-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Where to Put 1-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cigarette Lighter 2-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Breakers and Fuses 6-68 . . . . . . . . . . . . . . . . . . . . . . .
Cleaner, Air 6-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning
Aluminum Wheels 6
-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coated Moldings 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convenience Net 6-58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convertible Top 6-61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exterior Lamps/Lenses 6-60 . . . . . . . . . . . . . . . . . . . . . . . .
Fabric 6-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glass Surfaces 6-58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inside of Your Vehicle 6-56 . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument Panel 6-58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior Plastic Components 6-58 . . . . . . . . . . . . . . . . . . . . .
Leather 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outside of Your Vehicle 6-60 . . . . . . . . . . . . . . . . . . . . . . . .
Removable Roof Panel 6-60 . . . . . . . . . . . . . . . . . . . . . . . . .

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9-3
Security Shade 6-58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Soft-Touch Paint Surfaces 6-58 . . . . . . . . . . . . . . . . . . . . . .
Tires 6-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vinyl 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weatherstrips 6-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wheels 6-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield and Wiper Blades 6-59 . . . . . . . . . . . . . . . . . . .
Cleaning, Wiper Blades 6-59 . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning Your Convertible Top 6-61 . . . . . . . . . . . . . . . . . . . .
Climate Control, Automatic Electronic Dual 3-4 . . . . . . . . . . .
Clock, Setting the 3-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clutch, Hydraulic 6-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comfort Controls 3-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compact Disc
Adapter Kits 3
-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changer, Trunk-Mounted 3-23 . . . . . . . . . . . . . . . . . . . . . .
Player 3-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Care 3-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Competitive Driving 4-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Console, Center Storage 2-56 . . . . . . . . . . . . . . . . . . . . . . . . . .
Control of a Vehicle 4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convenience 2-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Net 2-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Net, Cleaning 6-58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convertible Top 2-68 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning 6-61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lowering 2-69 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Raising 2-72 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convex Outside Mirror 2-56 . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant 5-11, 5-13, 6-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Surge Tank 5-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Surge Tank Pressure Cap 6-22 . . . . . . . . . . . . . . . . . . . . . . .
Coolant Heater, Engine 2-25 . . . . . . . . . . . . . . . . . . . . . . . . . . Cooling System 5
-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Corvette Assembly Plant vii. . . . . . . . . . . . . . . . . . . . . . . . . . .
Courtesy Lamps 2
-53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Courtesy Transportation 8-8 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise Control 2-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customer Assistance
For Text Telephone Users 8
-4 . . . . . . . . . . . . . . . . . . . . . . .
Information 8-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offices 8-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customer Satisfaction Procedure 8-2 . . . . . . . . . . . . . . . . . . . .
Daytime Running Lamps 2-51 . . . . . . . . . . . . . . . . . . . . . . . .
Dead Battery 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defects, Reporting Safety 8-10, 8-11 . . . . . . . . . . . . . . . . . . .
Defensive Driving 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defogger, Rear Window 3-11 . . . . . . . . . . . . . . . . . . . . . . . . .
Defogging 3-3, 3-7, 3-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defrosting 3-3, 3-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DIC Warnings and Messages 2-102 . . . . . . . . . . . . . . . . . . . . .
Dimensions, Vehicle 6-76 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door Locks 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Downshifting 2-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver Information Center (DIC) 2-92 . . . . . . . . . . . . . . . . . . .
Driver Information Center (DIC) Controls and Displays 2-93
Fuel 2-93 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gages 2-94 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Options 2-97 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trip 2-95 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver Information Center (DIC) Messages
ABS Active 2
-102 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Act Hndling Warming Up 2-102, 4-10 . . . . . . . . . . . . . . . .
Active Handling 2-108 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake Before Shift 2-112 . . . . . . . . . . . . . . . . . . . . . . . . . . .