1999 BUICK RIVIERA Owner's Manual

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This light should come on, as a check to show you it is
working, when the ignition is on and the engine is not
running. If the light doesn't come on, have it repaired.
This light will also come on during a malfunction in one
of two ways:

Light Flashing
-- A misfire condition has been
detected. A misfire increases vehicle emissions and
may damage the emission control system on your
vehicle. Dealer or qualified service center diagnosis
and service may be required.

Light On Steady
-- An emission control system
malfunction has been detected on your vehicle.
Dealer or qualified service center diagnosis and
service may be required.If the Light Is Flashing
The following may prevent more serious damage to
your vehicle:

Reducing vehicle speed.

Avoiding hard accelerations.

Avoiding steep uphill grades.

If you are towing a trailer, reduce the amount of
cargo being hauled as soon as it is possible.
If the light stops flashing and remains on steady, see ªIf
the Light Is On Steadyº following.
If the light continues to flash, when it is safe to do so,
stop the vehicle. Find a safe place to park your vehicle.
Turn the key off, wait at least 10 seconds and restart the
engine. If the light remains on steady, see ªIf the Light
Is On Steadyº following. If the light is still flashing,
follow the previous steps, and drive the vehicle to your
dealer or qualified service center for service.

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If the Light Is On Steady
You may be able to correct the emission system
malfunction by considering the following:
Did you recently put fuel into your vehicle?
If so, reinstall the fuel cap, making sure to fully install
the cap. See ªFilling Your Tankº in the Index. The
diagnostic system can determine if the fuel cap has been
left off or improperly installed. A loose or missing fuel
cap will allow fuel to evaporate into the atmosphere. A
few driving trips with the cap properly installed should
turn the light off.
Did you just drive through a deep puddle of water?
If so, your electrical system may be wet. The condition
will usually be corrected when the electrical system
dries out. A few driving trips should turn the light off.
Are you low on fuel?
As your engine starts to run out of fuel, your engine may
not run as efficiently as designed since small amounts of
air are sucked into the fuel line causing a misfire. The
system can detect this. Adding fuel should correct this
condition. Make sure to install the fuel cap properly. See
ªFilling Your Tankº in the Index. It will take a few
driving trips to turn the light off.Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel (see
ªFuelº in the Index). Poor fuel quality will cause your
engine not to run as efficiently as designed. You may
notice this as stalling after start
-up, stalling when you
put the vehicle into gear, misfiring, hesitation on
acceleration or stumbling on acceleration. (These
conditions may go away once the engine is warmed up.)
This will be detected by the system and cause the light
to turn on.
If you experience one or more of these conditions,
change the fuel brand you use. It will require at least one
full tank of the proper fuel to turn the light off.
If none of the above steps have made the light turn off,
have your dealer or qualified service center check the
vehicle. Your dealer has the proper test equipment and
diagnostic tools to fix any mechanical or electrical
problems that may have developed.

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2-77 Oil Pressure Light
This light tells you if there
could be a problem with
your engine oil pressure.
When this light comes on and stays on, it means oil isn't
going through your engine properly. You could be low
on oil, or you might have some other oil problem.
CAUTION:
Don't keep driving if the oil pressure is low. If
you do, your engine can become so hot that it
catches fire. You or others could be burned.
Check your oil as soon as possible and have your
vehicle serviced.
NOTICE:
Damage to your engine from neglected oil
problems can be costly and is not covered by
your warranty.
Check Oil Level Light
The CHECK OIL LEVEL
light is lit for two to four
seconds as a bulb check
each time the ignition key is
turned to RUN.
If the light doesn't come on, have your vehicle serviced.
If the engine oil is more than 1 qt. (0.95 L) low, this
light will turn on for about one minute and then will
remain off until the next time you start the vehicle only
if the vehicle has been shut off for at least eight minutes.
If the CHECK OIL LEVEL light comes back on, the
engine oil should be checked at the dipstick then
brought up to the proper level if necessary. See ªEngine
Oilº in the Index.

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2-78 Brake To Shift Light
This light will come on to
remind you that you must
press the brake pedal to
shift out of PARK (P).
Cruise Light
The CRUISE light comes
on when you set your cruise
control. See ªCruise
Controlº in the Index.
Door Ajar Light
When the ignition is on, this
light will stay on until both
doors are closed and
completely latched.
Fuel Gage
The fuel gage shows
about how much fuel is
in your tank.

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It works only when the ignition is on. When the
indicator nears Empty (E) you still have a little fuel left.
There is a reserve of about 1.5 gallons (5.6 L) in the fuel
tank. You need to get more fuel right away.
Here are some concerns some owners have had about
the fuel gage. All these situations are normal and do not
indicate anything wrong with the fuel gage.

At the gas station, the gas pump shuts off before the
gage reads Full (F).

It takes more (or less) gas to fill up than the gage
indicated. For example, the gage may have indicated
half full, but it took more (or less) than half of the
tank's capacity to fill it.

The gage moves a little when you turn a corner,
speed up or stop your vehicle.

When you turn the engine off, the gage doesn't go all
the way back to Empty (E).Low Fuel Light
A light near the Empty (E)
mark on the fuel gage
comes on when your vehicle
is low on fuel. You have
less than 3 gallons (11.7 L)
remaining in your fuel tank.

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-NOTES

3-
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Section 3 Comfort Controls and Audio Systems
In this section, you'll find out how to operate the comfort control and audio systems offered with your vehicle. Be
sure to read about the particular systems supplied with your vehicle.
3
-2 Comfort Controls
3
-2 Dual Automatic ComforTemp Climate Control
3
-5 Air Conditioning
3
-5 Heating
3
-6 Defogging and Defrosting
3
-6 Rear Window Defogger
3
-7 Passenger Zone Comfort Control
3
-7 Ventilation System
3
-9 Steering Wheel Controls for Climate
Control (Option)
3
-9 Audio Systems
3
-9 Setting the Clock3
-10 AM-FM Stereo with Cassette Tape
and Compact Disc Player with Automatic
Tone Control
3
-15 Theft-Deterrent Feature
3
-17 Audio Steering Wheel Controls (Option)
3
-18 Understanding Radio Reception
3
-18 Tips About Your Audio System
3
-19 Care of Your Cassette Tape Player
3
-20 Care of Your Compact Discs
3
-20 Care of Your Compact Disc Player
3
-20 Power Antenna Mast Care

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Comfort Controls
This section describes how to operate your climate
control system. Your climate control system uses
ozone
-friendly R-134a refrigerant.
Dual Automatic ComforTemp
Climate Control
Your vehicle has the Dual Automatic ComforTemp
Climate Control system. The following information tells
you how it works.
You will hear a beep each time a button is pushed and a
small light on the button will indicate which buttons are
active. The lights are on all buttons except TEMP, FAN
and AIR FLOW. The display will show fan speed,
comfort level setting and airflow direction for a few
seconds whenever AUTO is selected, and then it will
display the outside temperature. The outside temperature
reading is most accurate when the vehicle is moving.
During stops, the display shows the previous
temperature for best accuracy and system control.
If the display is flashing after the climate control system
is started, there is a problem with the system and you
should see your dealer for service.
Sun and temperature sensors automatically adjust the air
temperature, the airflow direction and the fan speed to
maintain your comfort setting. The system may supply
cooler air to the side toward the sun. Be careful not to
put anything over the sensors on top of the dash.