1999 BUICK LESABRE engine

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2-62
CAUTION:
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 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 you try to drive off with the parking
brake set, a chime will also come on until you release
the parking brake. If the light and chime stay on after
your parking brake is fully released, it means you have
a brake problem.
Anti-Lock Brake System Warning Light
With the anti-lock brake
system, the light(s) will
come on when you start
your engine and may stay
on for several seconds.
That's normal.
If the light stays on, turn the ignition to OFF. Or, if the
light comes 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 vehicle needs
service. If the regular brake system warning light isn't
on, you still have brakes, but you don't have anti
-lock
brakes. If the regular brake system warning light is also
on, you don't have anti
-lock brakes and there's a
problem with your regular brakes. See ªBrake System
Warning Lightº earlier in this section.
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.

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2-63 Traction Control System Warning
Light (Option)
This warning light should
come on briefly as you start
the engine. If the warning
light doesn't come on then,
have it fixed so it will be
ready to warn you if there's
a problem.
If it stays on, or comes on when you're driving, there
may be a problem with your traction control system and
your vehicle may need service. When this warning light
is on, the system will not limit wheel spin. Adjust your
driving accordingly.The traction control system warning light may come on
for the following reasons:

If you turn the system off by pressing the button
located to the left of the steering column, the
warning light will come on and stay on. To turn the
system back on, press the button again. The warning
light should go off. (See ªTraction Control Systemº
in the Index for more information.)

If there's a brake system problem that is specifically
related to traction control, the traction control system
will turn off and the warning light will come on. If
your brakes begin to overheat, the traction control
system will turn off and the warning light will come
on until your brakes cool down.

If the traction control system is affected by an
engine
-related problem, the system will turn off and
the warning light will come on.
If the traction control system warning light comes on
and stays on for an extended period of time when the
system is turned on, your vehicle needs service.

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2-64 Engine Coolant Temperature
Warning Light
This light will tell you
that your engine coolant
has overheated or your
radiator cooling fans are
not working.
If you have been operating your vehicle under normal
driving conditions, you should pull off the road, stop
your vehicle and turn the engine off as soon as possible.
See ªEngine Overheatingº in the Index.
Engine Coolant Temperature Gage
(If Equipped)
If your vehicle is equipped
with the gage cluster, you
have a gage that shows the
engine coolant temperature.
If the gage pointer moves
into the red area, your
engine is too hot!
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.
The engine coolant temperature gage indicates the
coolant temperature in degrees Fahrenheit. The
Canadian instrument panels indicate the coolant
temperature in degrees Celsius.
See ªEngine Overheatingº in the Index.

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2-65 Malfunction Indicator Lamp
(Check Engine Light)
Your vehicle is equipped
with a computer which
monitors operation of the
fuel, ignition and emission
control systems.
This system is called OBD II (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. The CHECK ENGINE light comes on 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.
NOTICE:
Modifications made to the engine, transaxle,
exhaust or fuel system of your vehicle or the
replacement of the original tires with other than
those of the same Tire Performance Criteria
(TPC) can affect your vehicle's emission controls
and may cause the CHECK ENGINE light to
come on. Modifications to these systems could
lead to costly repairs not covered by your
warranty. This may also result in a failure to pass
a required Emission Inspection/Maintenance test.

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2-66
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.
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.

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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.
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.
Oil Pressure Light/Gage
Standard Cluster
If your vehicle has the standard instrument panel cluster,
this light will come on if there is a problem with your
engine oil pressure.
Gage Cluster
If your vehicle has the optional gage cluster, you can
read your oil pressure directly from the gage on your
instrument panel. A small light to the left of the gage will
come on if there is a problem with the engine oil pressure.

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2-68
The oil light could come on briefly when you turn your
key to RUN. It goes off once you turn it to START.
That's just a check to be sure the light works. If it
doesn't, be sure to have it fixed so it will be there to
warn you if something goes wrong.
But, 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.
See your dealer for service.
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 (If Equipped)
The CHECK OIL LEVEL
light turns on for three
seconds as a bulb check
each time the ignition key is
turned to RUN. If the light
doesn't turn on, have your
vehicle serviced.
If the engine oil is more than one quart (0.95 L) low and
the engine has been shut off for at least eight minutes,
the CHECK OIL LEVEL light will turn on for about
one minute and will then remain off until the next time
you start the vehicle.
If the CHECK OIL LEVEL light turns 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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2-69 Change Oil Soon Light (If Equipped)
This light is activated
by the Engine Oil Life
Monitor System.
The CHANGE OIL SOON light turns on for three
seconds as a bulb check each time the ignition key is
turned to RUN. It will stay on for 60 seconds once
90 percent of the oil life has been used and each time the
engine is started after that. If the CHANGE OIL SOON
light is on continuously, there is a problem with the
Engine Oil Life Monitor System and service is required.
The Engine Oil Life Monitor determines the condition
of the engine oil and lets you know when the oil should
be changed. See ªEngine Oilº in the Index.
The Engine Oil Life Monitor receives information about
engine speed, coolant temperature and vehicle speed to
determine how much the oil has degraded.
When to change your oil depends on your driving habits
and conditions. The CHANGE OIL SOON light may
turn on as early as 2,000 miles (3 218 km) or less for
harsh circumstances.For additional information, see ªEngine Oil, When to
Changeº in the Index. To reset the Oil Life Monitor, see
ªEngine Oil Life Monitorº in the Index.
Cruise Light
The cruise light comes on
whenever you set your
cruise control. See ªCruise
Controlº in the Index.
Washer Fluid Low Light (If Equipped)
When the vehicle has a low
fluid condition, this light
will come on to remind
you to get more washer
fluid soon.