warning BUICK LACROSSE 2015 Repair Manual

Black plate (20,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
5-20 Instruments and Controls
Electric Parking Brake
Light
MetricEnglish
The parking brake status light
comes on when the brake is
applied. If the light continues
flashing after the parking brake is
released, or while driving, there is a
problem with the electric parking
brake system. A message may also
display on the Driver Information
Center (DIC). See Brake System
Messages on page 5-36.
If the light does not come on,
or remains flashing, see your dealer.
Service Electric Parking
Brake Light
This light should come on briefly
when starting the vehicle. If it does
not come on, have it fixed so it will
be ready to warn if there is a
problem.
If this light stays on, there is a
problem with the Electric Parking
Brake system or another system on
the vehicle that is causing the
parking brake system to work at a
reduced level. The vehicle can still
be driven, but should be taken to a
dealer as soon as possible. See the
information for the Electric Parking
Brake under Parking Brake on
page 9-31. If a message displays in the Driver Information Center (DIC),
see
Brake System Messages on
page 5-36.
Antilock Brake System
(ABS) Warning Light
This light comes on briefly when the
engine is started.
If the light does not come on, have it
fixed so it will be ready to warn if
there is a problem.
If the light comes on while driving,
stop as soon as it is safely possible
and turn off the vehicle. Then start
the engine again to reset the
system. If the ABS light stays on,
or comes on again while driving, the
vehicle needs service. A chime may
also sound when the light comes on
steady.

Black plate (21,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
Instruments and Controls 5-21
If the ABS light is the only light on,
the vehicle has regular brakes, but
the antilock brakes are not
functioning.
If both the ABS and the brake
system warning light are on, the
vehicle's antilock brakes are not
functioning and there is a problem
with the regular brakes. See your
dealer for service.
SeeBrake System Warning Light on
page 5-19 andBrake System
Messages on page 5-36.
Lane Departure Warning
(LDW) Light
This light is green if LDW is on and
ready to operate. This light changes to amber and
flashes to indicate that the lane
marking has been crossed without
using a turn signal in that direction.
See
Lane Departure Warning (LDW)
on page 9-57.
Vehicle Ahead Indicator
If equipped, this indicator will
display green when a vehicle is
detected ahead and amber when
you are following a vehicle ahead
much too closely.
See Forward Collision Alert (FCA)
System on page 9-50.
Traction Off Light
This light comes on briefly while
starting the engine. If it does not,
have the vehicle serviced by your
dealer. If the system is working
normally, the indicator light then
turns off.
The traction off light comes on when
the Traction Control System (TCS)
has been turned off by pressing and
releasing the TCS/StabiliTrak
button.
This light and the StabiliTrak OFF
light come on when StabiliTrak is
turned off.
If the TCS is off, wheel spin is not
limited. Adjust driving accordingly.
See Traction Control/Electronic
Stability Control on page 9-34.

Black plate (22,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
5-22 Instruments and Controls
StabiliTrak®OFF Light
This light comes on briefly while
starting the engine. If it does not,
have the vehicle serviced by your
dealer.
This light comes on when the
StabiliTrak system is turned off.
If StabiliTrak is off, the Traction
Control System (TCS) is also off.
If the StabiliTrak and TCS are off,
the system does not assist in
controlling the vehicle. Turn on the
TCS and the StabiliTrak systems
and the warning light turns off.
SeeTraction Control/Electronic
Stability Control on page 9-34.
Traction Control System
(TCS)/StabiliTrak®Light
This light comes on briefly when the
engine is started.
If the light does not come on, have
the vehicle serviced by your dealer.
If the system is working normally,
the indicator light turns off.
If the light is on and not flashing, the
TCS and potentially the StabiliTrak
system have been disabled. A DIC
message may display. Check the
DIC messages to determine which
feature(s) is no longer functioning
and whether the vehicle requires
service. If the indicator/warning light is on
and flashing, the TCS and/or the
StabiliTrak system is actively
working.
See
Traction Control/Electronic
Stability Control on page 9-34.
Engine Coolant
Temperature Warning
Light
This light comes on briefly while
starting the vehicle.
If it does not, have the vehicle
serviced by your dealer. If the
system is working normally the
indicator light goes off.

Black plate (23,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
Instruments and Controls 5-23
{Caution
The engine coolant temperature
warning light indicates that the
vehicle has overheated. Driving
with this light on can damage the
engine and it may not be covered
by the vehicle warranty. See
Engine Overheating on
page 10-21.
The engine coolant temperature
warning light comes on when the
engine has overheated.
If this happens, pull over and turn
off the engine as soon as possible.
See Engine Overheating on
page 10-21.
Tire Pressure Light
For vehicles with the Tire Pressure
Monitor System (TPMS), this light
comes on briefly when the engine is
started. It provides information
about tire pressures and the TPMS.
When the Light Is On Steady
This indicates that one or more of
the tires are significantly
underinflated.
A Driver Information Center (DIC)
tire pressure message may also
display. See Tire Messages on
page 5-43. Stop as soon as
possible, and inflate the tires to the
pressure value shown on the Tire
and Loading Information label. See
Tire Pressure on page 10-50. When the Light Flashes First and
Then Is On Steady
If the light flashes for about a minute
and then stays on, there may be a
problem with the TPMS. If the
problem is not corrected, the light
will come on at every ignition cycle.
See
Tire Pressure Monitor
Operation on page 10-52.
Engine Oil Pressure Light
{Caution
Lack of proper engine oil
maintenance can damage the
engine. Driving with the engine
oil low can also damage the
engine. The repairs would not be
covered by the vehicle warranty.
Check the oil level as soon as
possible. Add oil if required, but if
the oil level is within the operating
range and the oil pressure is still
low, have the vehicle serviced.
Always follow the maintenance
schedule for changing engine oil.

Black plate (24,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
5-24 Instruments and Controls
This light should come on briefly as
the engine is started. If it does not
come on, have the vehicle serviced
by your dealer.
If the light comes on and stays on, it
means that oil is not flowing through
the engine properly. The vehicle
could be low on oil and might have
some other system problem. See
your dealer.
Low Fuel Warning Light
This light is near the fuel gauge and
comes on briefly when the ignition is
turned on as a check to show it is
working.
It also comes on when the fuel tank
is low on fuel. The light turns off
when fuel is added. If it does not,
have the vehicle serviced.
Security Light
The security light should come on
briefly as the engine is started. If it
does not come on, have the vehicle
serviced by your dealer. If the
system is working normally, the
indicator light turns off.
If the light stays on and the engine
does not start, there could be a
problem with the theft-deterrent
system. SeeImmobilizer Operation
(Key Access) on page 2-16 or
Immobilizer Operation (Keyless
Access) on page 2-17.

Black plate (31,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
Instruments and Controls 5-31
Driver Efficiency Gauge (eAssist
Only):Assists in driving efficiently
and will vary based on driver input.
To maximize efficiency, keep the
leaf in the solid green zone in the
center of the gauge. The gauge
moves down when braking and up
when accelerating. When either is
done aggressively, the vehicle is
being driven less efficiently and the
gauge will move further from the
center
Drive Cycle Summary (eAssist
Only): Displays the distance
traveled and the fuel economy for
that trip.
Top Consumers: Displays the top
four vehicle energy consumers,
along with their total fuel
consumption.
Economy Trend: Displays history
of the Average Fuel Economy from
the last 50 km (30 miles). Each bar
represents about 5 km (3 miles) of
driving. The fuel economy will range
from 0 –15 L/100 km (0 –50 mpg).
During driving the bars will shift to always reflect the most recent
distance on the right side. This
display cannot be reset.
ECO Index:
The bar graph on the
left hand side provides feedback on
the efficiency of current driving
behavior. The graph shows
a percentage value that is based on
current fuel consumption compared
to what is expected from the vehicle
with good and bad driving habits.
Each box represents 10%, with all
boxes filled being 100%. More
economical driving will result in
being in the ECO box.
Instantaneous Fuel Economy is also
shown on right hand side. This
display cannot be reset.
Head-Up Display (HUD)
{Warning
If the HUD image is too bright or
too high in your field of view, it
may take you more time to see
(Continued)
Warning (Continued)
things you need to see when it is
dark outside. Be sure to keep the
HUD image dim and placed low in
your field of view.
If equipped with HUD, some
information concerning the
operation of the vehicle is projected
onto the windshield. The information
is projected through the HUD lens
on the driver side of the instrument
panel and focused out toward the
front of the vehicle.
{Caution
If you try to use the HUD image
as a parking aid, you may
misjudge the distance and
damage your vehicle. Do not use
the HUD image as a parking aid.

Black plate (33,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
Instruments and Controls 5-33
Use the following settings to adjust
the HUD.
«orª(Image Adjustment):
Press the up or down arrows to
center the HUD image. The HUD
image can only be adjusted up and
down, not side to side.
Image Brightness: Turn the
dimming knob clockwise or
counterclockwise to brighten or dim
the display.
The HUD image will automatically
dim and brighten to compensate for
outside lighting. The HUD
brightness control can also be
adjusted as needed.
The HUD image can temporarily
light up depending on the angle and
position of the sunlight on the HUD
display. This is normal.
Polarized sunglasses could make
the HUD image harder to see.
PAGE: Press to select the display
view. Release the PAGE button
when the desired display is shown on the HUD. If vehicle messages
are displayed, pressing PAGE may
clear the message.
OFF:
To turn HUD off, turn the
HUD dimming knob fully
counterclockwise until the HUD
display turns off.
HUD Views
There are four views in the HUD.
Some vehicle information and
vehicle messages or alerts may be
displayed in any view.
Metric
English
Speed View: This display gives the
speedometer reading (in English or
metric units), Adaptive Cruise
Control speed, Lane Departure
Warning, and Vehicle Ahead
indicator. Some information only
appears on vehicles that have these
features, and when they are active.
Metric

Black plate (40,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
5-40 Instruments and Controls
Lamp Messages
AFL (Adaptive Forward
Lighting) LAMPS NEED
SERVICE
This message displays when the
Adaptive Forward Lighting (AFL)
system is disabled and needs
service. See your dealer. See
Adaptive Forward Lighting (AFL) on
page 6-3for more information.
Object Detection System
Messages
AUTOMATIC COLLISION
PREP OFF
This message displays when the
Active Emergency Braking System
has been turned off. See Active
Emergency Braking System on
page 9-53.
AUTOMATIC COLLISION PREP
REDUCED
This message displays when the
Active Emergency Braking System
has been set to the Alert setting.
This setting disables most automatic
braking functions of the Auto
Collision Preparation feature. Some
last-second automatic braking
capability is still provided with the
Alert setting, but braking is less
likely to occur. See Active
Emergency Braking System on
page 9-53.
AUTOMATIC COLLISION
PREPARATION UNAVAILABLE
This message displays when the
Active Emergency Braking System
has been unavailable for some time.
The Active Emergency Braking
System does not need service.
This can occur under the following
conditions:
.The radar is not clean. Keep the
radar sensors free of mud, dirt,
snow, ice, and slush. Clean the entire front and/or rear of the
vehicle. For cleaning
instructions, see
Exterior Care
on page 10-85.
.Heavy rain or snow is interfering
with the radar object detection or
camera performance.
This message may also be
displayed if there is a problem with
the StabiliTrak system.
FORWARD COLLISION
ALERT OFF
This message displays when the
Forward Collision Alert has been
turned off.
FRONT CAMERA BLOCKED
CLEAN WINDSHIELD
This message displays when the
camera is blocked. Cleaning the
outside of the windshield behind the
rearview mirror may correct the
issue. The Lane Departure Warning
system will not operate. Forward
Collision Alert (FCA) may not work
or may not work as well.

Black plate (41,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
Instruments and Controls 5-41
LANE CHANGE ALERT OFF
This message indicates that the
driver has turned the Side Blind
Zone Alert (SBZA) and Lane
Change Alert (LCA) systems off.
LANE DEPARTURE WARNING
UNAVAILABLE
This message displays when
attempting to activate the Lane
Departure Warning (LDW) system
when it is temporarily unavailable.
The LDW system does not need
service.
This message could be due to the
camera being blocked. Cleaning the
outside of the windshield behind the
rearview mirror may correct the
issue.
PARK ASSIST OFF
This message displays when the
Parking Assist system has been
turned off or when there is a
temporary condition causing the
system to be disabled.
REAR CROSS TRAFFIC
ALERT OFF
This message displays when the
Rear Cross Traffic Alert has been
turned off.
SERVICE AUTOMATIC
COLLISION PREP
If this message displays, take the
vehicle to your dealer to repair the
system. Adaptive Cruise Control
(ACC), Forward Collision Alert
(FCA), and/or the Active Emergency
Braking System may not work. Do
not use these systems until the
vehicle has been repaired.
SERVICE FRONT CAMERA
If this message remains on after
continued driving, the vehicle needs
service. Do not use the Lane
Departure Warning (LDW) and
Forward Collision Alert (FCA)
features. Take the vehicle to your
dealer.
SERVICE PARKING ASSIST
This message displays if there is a
problem with the Parking Assist
system. Do not use this system to
help you park. See your dealer for
service.
SERVICE SIDE DETECTION
SYSTEM
If this message remains on after
continued driving, the vehicle needs
service. Side Blind Zone Alert
(SBZA), Lane Change Alert (LCA),
and Rear Cross Traffic Alert (RCTA)
features will not work. Take the
vehicle to your dealer.
SIDE DETECTION SYSTEM
UNAVAILABLE
This message indicates that Side
Blind Zone Alert (SBZA), Lane
Change Alert (LCA), and Rear
Cross Traffic Alert (RCTA) are
disabled either because the sensor
is blocked and cannot detect
vehicles in the blind zone, or the
vehicle is passing through an open
area, such as the desert, where

Black plate (44,1)Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
7707475) - 2015 - CRC - 10/9/14
5-44 Instruments and Controls
The low tire pressure warning light
will also come on. SeeTire
Pressure Light on page 5-23.
If a tire pressure message displays,
inflate the tires until the tire pressure
is equal to the values shown on the
Tire and Loading Information label.
See Tires on page 10-42, Vehicle
Load Limits on page 9-10, and Tire
Pressure on page 10-50.
More than one tire pressure
message can be received at a time.
The DIC also shows the tire
pressure values. See Driver
Information Center (DIC) on
page 5-28.
Transmission Messages
SERVICE TRANSMISSION
This message displays if there is a
problem with the transmission. See
your dealer.
SHIFT TO PARK
This message displays when the
transmission needs to be shifted to
P (Park). This may appear when
attempting to remove the key from
the ignition or from the vehicle if the
vehicle is not in P (Park).
TRANSMISSION HOT —IDLE
ENGINE
This message displays and a chime
sounds if the transmission fluid in
the vehicle gets hot. Driving with the
transmission fluid temperature high
can cause damage to the vehicle.
Stop the vehicle and let it idle to
allow the transmission to cool. This
message clears when the fluid
temperature reaches a safe level.
Vehicle Speed Messages
SPEED LIMIT EXCEEDED
This message is displayed when the
vehicle speed is greater than the
speed warning speed. See "Speed
Warning" under Instrument Cluster
on page 5-8.
SPEED LIMIT SET TO XXX
This message is displayed when the
speed warning is set. See "Speed
Warning" under Instrument Cluster
on page 5-8.
Window Messages
OPEN, THEN CLOSE DRIVER/
PASSENGER WINDOW
This message is displayed when the
window needs to be reprogrammed.
If the vehicle's battery has been
recharged or disconnected, you will
need to program each front window
for the express-up feature to work.
See Power Windows on page 2-20.