ignition BUICK LUCERNE 2007 Service Manual

Rear Window Defogger
The rear window defogger uses a warming grid to
remove fog from the rear window.
<(Rear Window Defogger):Press this button
to turn the rear window defogger on or off. An
indicator light below the button will come on to
let you know that the rear window defogger is
activated. Be sure to clear as much snow from
the rear window as possible.
The rear window defogger will only work when the
ignition is in run. The rear window defogger will stay
on for about 20 minutes after the button is pressed
if you are traveling at slower vehicle speeds. At
higher vehicle speeds, the rear defogger may stay
on continuously. If turned on again, the defogger
will only run for about 10 minutes before turning off.
The defogger can be turned off by pressing
the button again, by turning the ignition to
ACCESSORY or RUN, or by turning off the engine.If your vehicle has heated outside rearview mirrors,
the mirrors will heat to help clear fog or frost from
the surface of the mirror when the rear window
defogger is on. SeeOutside Automatic Dimming
Heated Mirror on page 135for more information.
Notice:Do not use anything sharp on the
inside of the rear window. If you do, you could
cut or damage the warming grid, and the repairs
would not be covered by your warranty. Do not
attach a temporary vehicle license, tape, a decal
or anything similar to the defogger grid.
185

0(Defrost):Use this mode to remove fog or
frost from the windshield more quickly. Turning the
control to this mode directs most of the air to the
windshield and the side window outlets. In this
mode, the system will automatically turn off
recirculation and run the air-conditioning
compressor, unless the outside temperature is at or
below freezing. Recirculation cannot be selected
while in the defrost mode. Do not drive the vehicle
until all the windows are clear.
Rear Window Defogger
The rear window defogger uses a warming grid to
remove fog or frost from the rear window.
<(Rear Defogger):Press this button to turn
the rear window defogger on or off. An indicator
light below the button will come on to let you know
that the rear window defogger is activated. Be
sure to clear as much snow from the rear window
as possible.The rear window defogger will only work when the
ignition is in RUN. The rear window defogger will
stay on for about 20 minutes after the button is
pressed if you are traveling at slower vehicle
speeds. At higher vehicle speeds the rear window
defogger may stay on continuously. If turned
on again, the defogger will only run for about
10 minutes before turning off. The defogger can be
turned off by pressing the button again, by turning
the ignition to ACCESSORY or RUN, or by turning
off the engine.
The heated outside rearview mirrors will heat to
help clear fog or frost from the surface of the mirror
when the rear window defogger is on. SeeOutside
Automatic Dimming Heated Mirror on page 135for
more information.
Notice:Do not use a razor blade or sharp
object to clear the inside rear window. Do not
adhere anything to the defogger grid lines
in the rear glass. These actions may damage
the rear defogger. Repairs would not be
covered by your warranty.
191

If the airbag readiness light stays on after you
start the vehicle or comes on when you are driving,
your airbag system may not work properly.
Have your vehicle serviced right away.
{CAUTION:
If the airbag readiness light stays on after
you start your vehicle, it means the airbag
system may not be working properly. The
airbags in your vehicle may not inate in
a crash, or they could even inate without
a crash. To help avoid injury to yourself
or others, have your vehicle serviced right
away if the airbag readiness light stays on
after you start your vehicle.
The airbag readiness light should ash for a few
seconds when you turn the ignition key to RUN.
If the light does not come on then, have it xed so
it will be ready to warn you if there is a problem.
If there is a problem with the airbag system in your
vehicle, the Service airbag message will appear
on the DIC display. SeeDIC Warnings and
Messages on page 221for more information.
Passenger Airbag Status Indicator
Your vehicle has the passenger sensing system.
Your overhead console has a passenger airbag
status indicator.
When the ignition key is turned to RUN or START,
the passenger airbag status indicator will light ON
and OFF, or the symbol for on and off, for several
seconds as a system check. Then, after several
more seconds, the status indicator will light either
ON or OFF, or either the on or off symbol to let you
know the status of the right front passenger’s frontal
airbag and seat-mounted side impact airbag.
If the word ON or the on symbol is lit on the
passenger airbag status indicator, it means that
the right front passenger’s frontal airbag and
seat-mounted side impact airbag are enabled
(may inate).
United StatesCanada
198

Brake System Warning Light
Your vehicle’s hydraulic brake system is divided
into two parts. If one part is not working, the other
part can still work and stop you. For good braking,
though, you need both parts working well.
If the warning light comes on, there is a brake
problem. Have your brake system inspected
right away.
This light should come on briey when you turn the
ignition key to RUN. If it does not come on then,
have it xed so it will be ready to warn you if there’s
a problem.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
does not release fully. If it stays on after your
parking brake is fully released, it means you
have a brake problem.
If the light comes on while you are driving, 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 oor. It may take longer to stop. If the light is
still on, have the vehicle towed for service. See
Towing Your Vehicle on page 313.
{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 have pulled
off the road and stopped carefully, have
the vehicle towed for service.United StatesCanada
201

Anti-Lock Brake System
Warning Light
With the anti-lock brake
system, the light(s) will
come on when your
engine is started 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. SeeBrake System Warning
Light on page 201.
The anti-lock brake system warning light will come
on briey when you turn the ignition key to RUN.This is normal. If the light doesn’t come on then,
have it xed so it will be ready to warn you if there
is a problem.Traction Control System (TCS)
Warning Light
This warning light
should come on briey
when the engine is
started.
If the warning light does not come on then, have it
xed so it will be ready to warn you if there is a
problem. If it stays on, or comes on when you are
driving a SERVICE TRACTION CONTROL
message will appear in the Driver Information
Center (DIC). This indicates that there may be a
problem with your traction control system and your
vehicle may need service. When this warning light
is on and the SERVICE TRACTION CONTROL
message appears on the DIC, the system will not
limit wheel spin. Adjust your driving accordingly.
202

Tire Pressure Light
This light comes on
briey when you turn
the ignition to RUN.
It will also come on when one or more of your
tires are signicantly underinated.If your vehicle has a Driver Information Center
(DIC), a CHECK TIRE PRESSURE message will
accompany the light. SeeDIC Warnings and
Messages on page 221for more information.
Stop and check your tires as soon as it is safe to do
so. If underinated, inate to the proper pressure.
SeeTires on page 385for more information.
This light will ash for about 60 seconds and then
stay on if a problem is detected with the Tire
Pressure Monitor system.
SeeTire Pressure Monitor System on page 393
for more information.
205

Malfunction Indicator Lamp
Check Engine Light
Your vehicle has 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 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 325.
206

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 possibleIf 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 330.
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.
207

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 StatesCanada
211

Driver Information Center (DIC)
Your vehicle has a Driver Information Center (DIC).
All messages will appear in the DIC display
located below the speedometer in the instrument
panel cluster. The DIC buttons are located on
the instrument panel, to the left of the instrument
panel cluster.
The DIC comes on when the ignition is on. After a
short delay, the DIC will display the information
that was last displayed before the engine was
turned off.
The DIC displays trip, fuel, and vehicle system
information, and warning messages if a system
problem is detected. The bottom line of the
DIC shows the shift lever position indicator.
SeeAutomatic Transaxle Operation on page 119
for more information.If your vehicle’s DIC has these features, the
compass direction and the outside air temperature
may also display on the DIC when viewing the
trip and fuel information. The compass direction
appears on the top right corner of the DIC display.
The outside air temperature automatically
appears in the bottom right corner of the DIC
display. If there is a problem with the system that
controls the temperature display, the numbers
will be replaced with dashes. If this occurs, have
the vehicle serviced by your dealer.
The DIC also allows some features to be
customized. SeeDIC Vehicle Customization on
page 231for more information.
DIC Controls and Displays
The DIC has different displays which can be
accessed by pressing the DIC buttons located on
the instrument panel, to the left of the instrument
panel cluster.
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