light BUICK LUCERNE 2006 Repair Manual

Tire Pressure Light
This light should come on
briey as you start the
engine. It will then come on
only when a at or low
tire pressure condition
exists.
SeeCheck Tire Pressure System on page 5-63for
more information.
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 thelife 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 awhile, 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:Modications made to the engine,
transaxle, exhaust, intake, 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 this light to come on.
Modications 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. SeeAccessories
and Modifications on page 5-3.
3-44

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 does not come on, have it
repaired. This light will also come on during a
malfunction in one of two ways:
Light Flashing— A misre condition has been
detected. A misre increases vehicle emissions
and may damage the emission control system on
your vehicle. Diagnosis and service may be
required.
Light On Steady— An emission control system
malfunction has been detected on your vehicle.
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 ashing and remains on steady,
see “If the Light Is On Steady” following.If the light continues to ash, 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 ashing,
follow the previous steps, and see your dealer for
service as soon as possible.
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. SeeFilling the Tank on page 5-8.
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.
3-45

Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel.
SeeGasoline Octane on page 5-5. 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, misring, 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,
your dealer can check the vehicle. Your dealer has
the proper test equipment and diagnostic tools to x
any mechanical or electrical problems that may
have developed.Emissions Inspection and
Maintenance Programs
Some state/provincial and local governments have or
may begin programs to inspect the emission control
equipment on your vehicle. Failure to pass this
inspection could prevent you from getting a vehicle
registration.
Here are some things you need to know in order to help
your vehicle pass an inspection:
Your vehicle will not pass this inspection if the check
engine light is on or not working properly.
Your vehicle will not pass this inspection if the OBD
(on-board diagnostic) system determines that critical
emission control systems have not been completely
diagnosed by the system. The vehicle would be
considered not ready for inspection. This can happen if
you have recently replaced your battery or if your
battery has run down. The diagnostic system is
designed to evaluate critical emission control systems
during normal driving. This may take several days
of routine driving. If you have done this and your vehicle
still does not pass the inspection for lack of OBD
system readiness, your GM dealer can prepare the
vehicle for inspection.
3-46

Oil Pressure Light
{CAUTION:
Do not keep driving if the oil pressure is low.
If you do, your engine can become so hot that
it catches re. You or others could be burned.
Check your oil as soon as possible and have
your vehicle serviced.
Notice:Lack of proper engine oil maintenance
may damage the engine. The repairs would not be
covered by your warranty. Always follow the
maintenance schedule in this manual for changing
engine oil.This light tells you if there
could be a problem with
your engine oil pressure.
The light goes on when you turn your key to RUN or
START. It goes off once you start your engine. That is a
check to be sure the light works. If it does not come
on, be sure to have it xed so it will be there to warn you
if something goes wrong.
When the light comes on and stays on, it means that oil
is not owing through your engine properly. You could
be low on oil and you might have some other system
problem.
3-47

Security Light
For information
regarding this light,
seePASS-Key
®III+
Operation on page 2-20.
Fog Lamp Light
The fog lamps light will
come on when the fog
lamps are in use.
The light will go out when the fog lamps are turned off.
SeeFog Lamps on page 3-16for more information.
Cruise Control Light
This light comes on
whenever you set your
cruise control.
The light will go out when the cruise control is
turned off. SeeCruise Control on page 3-11for
more information.
Highbeam On Light
This light will come on
when the high-beam
headlamps are in use.
SeeHeadlamp High/Low-Beam Changer on page 3-8.
3-48

Fuel Gage
The fuel gage shows about how much fuel is in your
tank. It works only when the ignition is on. When the
indicator moves to the edge of the low fuel warning
band, the low fuel warning light will come on and
a chime will sound. You still have a little fuel left, but
you need to get more fuel right away.Here are some things that some owners ask about.
None of these show a problem with your fuel gage:
At the service station, the gas pump shuts off before
the gage reads full.
It takes more (or less) fuel to ll up than the gage
indicated. For example, the gage may have
indicated half full, but it took more (or less) than
half the tank’s capacity to ll it.
The gage moves up a little when you turn a corner,
speed up or make a hard stop.
The gage does not go back to empty when you
turn off the ignition.
United States
Canada
3-49

Customization Menu Items
U
(Customization):Press this button to enter the
feature settings menu. This display allows you to
customize the feature settings on your vehicle.
SeeDIC Vehicle Customization on page 3-65for
more information.
DIC Warnings and Messages
Messages are displayed on the DIC to notify the driver
that the status of the vehicle has changed and that
some action may be needed by the driver to correct the
condition. Multiple messages may appear one after
another. Some messages may not require immediate
action, but you can press the set/reset button to
acknowledge that you received the message and clear it
from the DIC display. Pressing any of the DIC buttons
will also acknowledge and clear any messages.
Some messages cannot be cleared from the DIC display
because they are more urgent. These messages
require action before they can be cleared. You should
take any messages that appear on the display seriously
and remember that clearing the messages will only
make the messages disappear, not correct the problem.
The following are the possible messages that can be
displayed and some information about them.
AUTOMATIC LIGHT CONTROL OFF
This message will display when the automatic
headlamps are turned off.
AUTOMATIC LIGHT CONTROL ON
This message will display when the automatic
headlamps are turned on.
CHANGE ENGINE OIL SOON
This message will display when service is required
for the vehicle. See your GM dealer. SeeEngine Oil
on page 5-15andScheduled Maintenance on page 6-4
for more information.
Acknowledging the CHANGE ENGINE OIL SOON
message will not reset the OIL LIFE REMAINING.
That must be done at the OIL LIFE screen under the
vehicle information menu. See “Oil Life” underDIC
Controls and Displays on page 3-50andEngine Oil Life
System on page 5-18.
3-56

CHECK TIRE PRESSURE
This warning message and the tire pressure light on
the instrument panel cluster will appear when the
air pressure in one of the tires is too low or too high.
Check the vehicle’s tire pressure as soon as possible,
and ll or deate the affected tire to the appropriate
level. The correct tire ination pressure should be set to
those shown on the tire-loading information label on
the vehicle. SeeLoading Your Vehicle on page 4-29and
Tire Pressure Light on page 3-44for more information.
This message is reset when it is acknowledged.
However, you must also reset the tire pressure system.
See “Reset Tire Pressure System” underDIC Controls
and Displays on page 3-50for more information.
DRIVER DOOR OPEN
This message will display when the driver’s door is not
closed properly. When this message appears, you should
make sure that the driver’s door is closed completely.
ENGINE HOT A/C (Air Conditioning) OFF
This message will display when the engine coolant
becomes hotter than the normal operating temperature.
To avoid added strain on a hot engine, the air
conditioning compressor is automatically turned off.
When the coolant temperature returns to normal,
the A/C operation will automatically resume. You can
continue to drive your vehicle. If this message continues
to appear, have the system repaired by your GM dealer
as soon as possible to avoid compressor damage.
ENGINE OIL LOW ADD OIL
This message will display when the vehicle’s engine oil
is low. Fill the oil to the proper level as soon as
possible. SeeEngine Compartment Overview on
page 5-12for the engine oil ll location. Also, see
Engine Oil on page 5-15for information on the kind of
oil to use and the proper oil level.
3-57

HEATED WASH (Washer) FLUID
SYSTEM OFF
This message will display when you manually turn off
the heated windshield washer uid system or when the
system automatically turns off. See “Heated Washer
Fluid” underWindshield Washer on page 3-10for more
information.
HEATING WASH (Washer) FLUID
WASH (Washer) WIPES PENDING
This message will display when you turn on the heated
windshield washer uid system. See “Heated Washer
Fluid” underWindshield Washer on page 3-10for more
information.
HOOD OPEN
If your vehicle has the remote start feature, this message
will display when the hood is not closed properly.
When this message appears, you should make sure that
the hood is closed completely. SeeHood Release on
page 5-11.
ICE POSSIBLE DRIVE WITH CARE
This message will display when the outside air
temperature is cold enough to create icy road conditions.
Adjust your driving accordingly.
LEFT REAR DOOR OPEN
This message will display when the driver’s side rear
door is not closed properly. When this message
appears, you should make sure that the passenger’s
door is closed completely.
OIL PRESSURE LOW STOP ENGINE
Notice:If you drive your vehicle while the engine
oil pressure is low, severe engine damage may
occur. If a low oil pressure warning appears on the
instrument panel cluster and/or DIC, stop the
vehicle as soon as possible. Do not drive the vehicle
until the cause of the low oil pressure is corrected.
SeeEngine Oil on page 5-15for more information.
This message will display when the vehicle’s engine oil
pressure is low. The oil pressure light will also appear
on the instrument panel cluster. SeeOil Pressure Light
on page 3-47.
Stop the vehicle immediately, as engine damage can
result from driving a vehicle with low oil pressure.
Have the vehicle serviced by your GM dealer as soon
as possible when this message is displayed.
3-59

SERVICE A/C (Air Conditioning)
SYSTEM
This message will display when the electronic sensors
that control the air conditioning and heating systems are
no longer working. Have the climate control system
serviced by your GM dealer if you notice a drop
in heating and air conditioning efficiency.
SERVICE AIR BAG
This message will display when there is a problem with
the airbag system. Have your vehicle serviced by
your GM dealer immediately. SeeAirbag Readiness
Light on page 3-36for more information.
SERVICE BATTERY CHARGING
SYSTEM
This message will display when there is a problem with
the generator and battery charging systems. Driving
with this problem could drain your battery. Turn off all
unnecessary accessories. Stop and turn off the
vehicle as soon as it is safe to do so. Have the electrical
system checked by your GM dealer immediately.
SERVICE BRAKE ASSIST
This message will display if there is a problem with the
brake system. The brake system warning light and
the anti-lock brake system warning light may also be
displayed on the instrument panel cluster. SeeBrake
System Warning Light on page 3-40andAnti-Lock
Brake System Warning Light on page 3-41for more
information. If this happens, stop as soon as possible
and turn off the vehicle. Restart the vehicle and
check for the message on the DIC display. If the
message is displayed or appears again when you begin
driving, the brake system needs service. See your
GM dealer as soon as possible. SeeBrakes on
page 5-40for more information.
SERVICE BRAKE SYSTEM
This message will display if the ignition is on to inform
the driver that the brake uid level is low. Have the
brake system serviced by your GM dealer as soon as
possible. The brake system warning light will also
appear on the instrument panel cluster when this
message appears on the DIC. SeeBrake System
Warning Light on page 3-40.
3-61