1997 BUICK CENTURY engine

Your brake system may not be working properly
if the brake system warning light is on. Driving
with the brake system warning light on can lead
to an accident.
If the light is still on or if the
anti-lock brake system warning light is flashing
after you’ve pulled
off the road and stopped
carefully, have the vehicle towed for service.
When the ignition is on, the brake system warning light
will also come on when you set your parking brake. The
light will stay
on if your parking brake doesn’t release
fully. If it stays on after your parking brake is
fully
released, it means you have a brake problem.
Anti-Lock Brake System Warning Light
ANTI -
LOCK
With the anti-lock brake
system, this light will come
on when
you start your
engine and it will stay
on
for three seconds.
That’s normal.
If the light flashes when you’re driving, you don’t have
anti-lock brakes and there could be
a problem with your
regular brakes. Pull off the road and stop carefully.
You
may notice that the pedal is harder to push. Or, the pedal
may
go closer to the floor. It may take longer to stop.
Have the vehicle towed for service. (See “Towing Your
Vehicle”
in the Index.)
2-58
ProCarManuals.com

ON:
Your regular brake system may not be working
properly if the anti-lock brake system warning
light is flashing. Driving with the anti-lock brake system warning light flashing can lead
to an
accident. After you’ve pulled off the road and
stopped carefully, have the vehicle towed
for service.
If the anti-lock brake system warning light stays on
longer than normal after you’ve started your engine, turn
the ignition
off. Or, if the light comes on and stays on
when you’re driving, stop as soon as possible and turn
the ignition
off. Then start the engine again to reset the
system. If
the light still stays on, or comes on again
while you’re driving, your Buick needs service, If the
light is
on but not flashing and the regular brake system
warning light isn’t on, you still have brakes, but you
don’t have anti-lock brakes.
The anti-lock brake system warning light should come
on briefly when
you turn the ignition key to RUN. If the
light doesn’t come
on then, have it fixed so it will be
ready to warn you
if there is a problem.
4nti-Lock Brake System Active Light
1
When your anti-lock system
is adjusting brake pressure
to help avoid a braking
skid,
the anti-lock brake system
Slippery road conditions may exist if this light comes
on,
so adjust your driving accordingly. The light will
stay
on for a few seconds after the system stops
adjusting brake pressure.
The anti-lock brake system active light also comes
on
briefly when you turn the ignition key to RUN. If the
light doesn’t come on then, have it fixed
so it will be
there to tell you when the system is active.
2-59
ProCarManuals.com

Engine Coolant Temperature Light Engine Coolant Temperature Gage
h -
TEMP
This light
tells you that your
engine coolant has
overheated or your radiator
cooling fan is not working.
The light should come on
briefly when your ignition
is turned on to show you
that it is working.
TEMPERATURE
You have a gage that shows
the engine coolant
temperature. If the gage
pointer moves into the red
area, your engine is too hot!
If you have been operating your vehicle under normal
driving conditions, you should pull
off the road, stop
your vehicle and turn
off the engine as soon as possible.
In “Problems on the Road,” this manual shows what to
do. See “Engine Overheating” in the Index. That reading means
the same thing as the warning light.
It means that your engine coolant has overheated.
If you
have been operating your vehicle under normal driving
conditions, you should pull
off the road, stop your
vehicle and turn
off the engine as soon as possible.
In “Problems on the Road,” this manual shows what to
do. See “Engine Overheating” in the Index.
2-60
ProCarManuals.com

Low Coolant Warning Light
LOW COOLANT
If this light comes on, your
system
is low on coolant
and the engine may
overheat. See “Engine
Coolant” in the Index and
have your vehicle serviced
as soon as you can. The
light will come on briefly
when your ignition is turned
on to show
you that it is
working properly.
Low Traction Light
LOW TRAC
When your anti-lock system
is adjusting brake pressure
to help avoid a braking skid,
this light will come on.
(Also see “Anti-Lock Brake
System Active Light”
earlier
in this section.)
Slippery road conditions may exist if the low traction
light comes on,
so adjust your driving accordingly. The
light will stay on for a few seconds after the anti-lock
system stops adjusting brake pressure.
The
LOW TRAC light also comes on briefly when you
turn the ignition key to
RUN. If the light doesn’t come
on then, have it fixed
so it will be there to tell you when
the anti-lock brake system is active.
2-61
ProCarManuals.com

Malfunction Indicator Lamp
(Service Engine Soon Light)
Your Buick is equipped
with a computer which
monitors operation
of the
fuel, ignition and emission
SERVICE ENGINE control systems.
SOON
This system is called OBD I1 (On-Board
Diagnostics-Second Generation) and
is intended to
assure that emissions are at acceptable levels for the life
of the vehicle, helping
to produce a cleaner
environment. (In Canada,
OBD I1 is replaced by
Enhanced Diagnostics.) The SERVICE ENGINE
SOON
light comes on and a chime will sound to indicate that
there
is a problem and service is required. Malfunctions
often will be indicated by the system before any
problem is apparent. This may prevent more serious
damage to your vehicle.
This system is also designed to
assist your service technician in correctly diagnosing
any malfunction.
NOTICE:
If you keep driving your vehicle with this light
on, after a while, your emission controls may not
work as well, your fuel economy may not be as
good and your engine may not run as smoothly.
This could lead to costly repairs that may not be
covered by your warranty.
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 is 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.
2-62
ProCarManuals.com

If the Light Is Flashing
The following may prevent more serious damage to
your vehicle:
0 Reducing vehicle speed.
0 Avoiding hard accelerations.
0 Avoiding steep uphill grades.
0 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
“If
the Light Is On Steady” 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 “If the Light
Is On Steady’’ following.
If the light is still flashing,
follow the previous steps, and drive the vehicle to your
dealer
or qualified service center for service.
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. 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.
2-63
ProCarManuals.com

Have you recently changed brands of fuel?
If
so, be sure to fuel your vehicle with quality fuel (see
“Fuel” 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.
Oil Warning Light
If you have a problem with
your oil, this light may stay
on after you start your
engine, or come on when
you are driving.
This indicates that oil is not going through your engine
quickly enough
to keep it lubricated. The engine could
be low on oil or could have some other oil problem.
Have it fixed right away.
The oil light could also come on in the
following situations:
The light will come on briefly when you turn on the
ignition to show
you that it is working properly. (If it
doesn’t come
on with the ignition on, you may have
a problem with the fuse or bulb. Have it fixed
right away.)
Sometimes when the engine is idling at a stop, the
light may blink on and off. This is normal.
ProCarManuals.com

Low Oil Level Light
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.
I NOTICE:
Damage to your engine from neglected oil
problems can be costly and
is not covered by your
warranty.
LOW
OIL
Your engine is equipped with
an oil level monitoring
system. When the ignition
key is turned
on, the LOW
OIL light will come on
briefly.
If the light does not
come on briefly, have it fixed
so it will be ready to warn
you if there’s a problem.
If
the light stays on, stop the vehicle on a level surface
and turn the engine off. Check the oil level using the
engine oil dipstick. (See “Engine Oil” in the Index.) If
the light does not flash, have the low oil level sensor
system repaired
so it will be ready to warn you if there’s
a problem.
The oil level monitoring system only checks oil level
during the brief period between key
on and engine
crank.
It does not monitor engine oil level when the
engine is running. Additionally, an oil level check
is
only performed if the engine has been turned off for a
considerable period of time, allowing the oil normally in
circulation
to drain back into the oil pan.
2-65
ProCarManuals.com