2010 BUICK LACROSSE Owner's Manual

Driving and Operating 8-35
Notice:Do not repeatedly brake
or accelerate heavily when TCS is
off. The vehicle's driveline could
be damaged.
The TCS off light comes on to
indicate that the traction control
system has been turned off.
When TCS is switched off on AWD
vehicles, the system may still make
noise. This is normal and necessary
with the AWD hardware on the
vehicle.
It might be necessary to turn the
system off if the vehicle gets stuck
in sand, mud or snow and rocking
the vehicle is required. See If the
Vehicle is Stuck
on page 8‑11for
more information. See also WinterDriving
on page 8‑9for
information on using TCS when
driving in snowy or icy conditions.
To turn the system off, pressg
located on the console to the right of
the shifter.
Press and release
gand the traction
control system turns off and the
traction control system warning light
comes on. Press
gagain to turn the
system back on. For information on
turning StabiliTrak off and on, see
StabiliTrak System following in this
section.
Adding non-GM accessories can
affect the vehicle's performance.
See Accessories and Modifications
on page 9‑3for more information.
Electronic Stability
Control (ESC)
The vehicle has a vehicle stability
enhancement system called
StabiliTrak. It is an advanced
computer controlled system that
assists with directional control of the
vehicle in difficult driving conditions.
StabiliTrak activates when the
computer senses a difference
between the intended path and the
direction the vehicle is actually
traveling. StabiliTrak selectively
applies braking pressure at any one
of the vehicle's brakes to help steer
the vehicle in the intended direction.
When the stability control system
activates, the Traction Control
System (TCS)/StabiliTrak light
flashes on the instrument panel.

8-36 Driving and Operating
This also occurs when traction
control is activated. A noise might
be heard or vibration might be felt in
the brake pedal. This is normal.
Continue to steer the vehicle in the
intended direction.
If there is a problem detected with
StabiliTrak, the TCS/StabiliTrak light
comes on and the system is not
operational. SeeElectronic Stability
Control (ESC)/Traction Control
System (TCS) Indicator/Warning
Light
on page 4‑22. Driving should
be adjusted accordingly.
StabiliTrak comes on automatically
whenever the vehicle is started. To
assist with directional control of the
vehicle, the system should always
be left on.
StabiliTrak can be turned off if
needed by pressing and holding
g
until the StabiliTrak Off light comes
on the instrument panel. For
information on turning TCS off and
on, see Traction Control System
(TCS) in this section.
If cruise control is being used when
StabiliTrak activates, the cruise
control automatically disengages.
Press the cruise control button to
reengage when road conditions
allow. See Cruise Control
on
page 8‑37for more information.
Selective Ride Control
The vehicle may have a ride control
system called Selective Ride
Control. The system provides the
following performance benefits:
.Reduced Impact Harshness
.Improved Road Isolation
.Improved High-Speed Stability
.Improved Handling Response
.Better Control of Body Ride
Motions
To switch from TOUR to SPORT
mode, move the shift lever to
the left while the transmission is
in D (Drive).

Driving and Operating 8-37
TOUR:Use for normal city and
highway driving. This setting
provides a smooth, soft ride.
SPORT: Use where road conditions
or personal preference demand
more control. This setting provides
more “feel”, or response to road
conditions through increased
steering effort and suspension
tuning.
The setting can be changed at any
time. Based on road conditions,
steering wheel angle and the
vehicle speed, the system
automatically adjusts to provide the
best handling while providing a
smooth ride. The Tour and Sport
modes will feel similar on a
smooth road.Cruise Control
With cruise control, the vehicle can
maintain a speed of about 40 km/h
(25 mph) or more without keeping
your foot on the accelerator. Cruise
control does not work at speeds
below 40 km/h (25 mph).
On vehicles with the Traction
Control System (TCS) or Electronic
Stability Control (ESC), the system
may begin to limit wheel spin while
you are using cruise control. If this
happens, the cruise control will
automatically disengage. See
Traction Control System (TCS)
on
page 8‑34or Electronic Stability
Control (ESC) on page 8‑35.
{WARNING
Cruise control can be dangerous
where you cannot drive safely at
a steady speed. So, do not use
the cruise control on winding
roads or in heavy traffic.
Cruise control can be dangerous
on slippery roads. On such roads,
fast changes in tire traction can
cause excessive wheel slip, and
you could lose control. Do not use
cruise control on slippery roads.

8-38 Driving and Operating
Setting Cruise Control
{WARNING
If you leave your cruise control on
when you are not using cruise,
you might hit a button and go into
cruise when you do not want to.
You could be startled and even
lose control. Keep the cruise
control switch off until you want to
use cruise control.
The cruise control buttons are
located on the steering wheel.
5(On/Off):Press to turn the
cruise control system on and off. An
indicator light will turn on or off in
the instrument panel cluster.
\(Cancel): Press to cancel cruise
control without erasing the set
speed from memory.
RES/+ (Resume/Accel): Move the
thumbwheel up to resume a set
speed or to accelerate to a higher
speed.
SET/− (Set/Coast): Move the
thumbwheel down to set a speed or
to decrease the speed.
To set a speed:
1. Press
5to turn cruise control
on. The indicator light in the
instrument panel cluster
comes on.
2. Get to the speed desired.

Driving and Operating 8-39
3. Move the thumbwheel downtoward SET/− and release it.
The desired set speed briefly
appears in the instrument panel
cluster.
4. Take your foot off the accelerator pedal.
When the brakes are applied, the
cruise control shuts off.
Resuming a Set Speed
If the cruise control is set at a
desired speed and then the brakes
are applied, the cruise control is
disengaged. To return to the
previously set speed, move the
thumbwheel up toward RES/+
briefly when the vehicle has
reached a speed of about 40 km/h
(25 mph) or more.
This accelerates the vehicle to the
previously selected speed. Increasing Speed While Using
Cruise Control
There are two ways to go to a
higher speed.
.Disengage the cruise control,
but do not turn it off.
.If the cruise control system is
already engaged, move the
thumbwheel up toward RES/+
and hold it until the vehicle
accelerates to the desired
speed, and then release it. To
increase the speed in small
amounts, move the thumbwheel
up toward RES/+ briefly and
then release it. Each time this is
done, the vehicle goes about
1.6 km/h (1 mph) faster.
Reducing Speed While Using
Cruise Control
If the cruise control system is
already engaged,
.Move the thumbwheel toward
SET/−
and hold until the desired
lower speed is reached, then
release it.
.To slow down in very small
amounts, move the thumbwheel
toward SET/− briefly. Each time
this is done, the vehicle goes
about 1.6 km/h (1 mph) slower.
Passing Another Vehicle While
Using Cruise Control
Use the accelerator pedal to
increase the vehicle's speed. When
you take your foot off the pedal, the
vehicle will slow down to the
previously set cruise control speed.

8-40 Driving and Operating
Using Cruise Control on Hills
How well the cruise control works
on hills depends upon the vehicle's
speed, load, and the steepness of
the hills. When going up steep hills,
you might have to step on the
accelerator pedal to maintain the
vehicle's speed. When going
downhill, you might have to brake or
shift to a lower gear to maintain the
vehicle's speed. When the brakes
are applied the cruise control
shuts off.Ending Cruise Control
There are three ways to disengage
the cruise control:
.Step lightly on the brake pedal
or clutch; when cruise control
disengages, the indicator light
will not be lit.
.Press\.
.Press5to turn the cruise
control system off completely.
The cruise control cannot be
resumed.
Erasing Speed Memory
The cruise control set speed
memory is erased when the cruise
control or the ignition is turned off.
Object Detection
Systems
Ultrasonic Parking Assist
For vehicles with the Ultrasonic
Rear Parking Assist (URPA) system,
it assists the driver with parking and
avoiding objects while in
R (Reverse). URPA operates at
speeds less than 8 km/h (5 mph),
and the sensors on the rear bumper
detect objects up to 2.5 m (8 ft.)
behind the vehicle, and at least
20 cm (8 in.) off the ground.

Driving and Operating 8-41
{WARNING
The Ultrasonic Rear Parking
Assist (URPA) system does not
replace driver vision. It cannot
detect:
.objects that are below the
bumper, underneath the
vehicle, or if they are too
close or far from the vehicle
.children, pedestrians,
bicyclists, or pets.
If you do not use proper care
before and while backing; vehicle
damage, injury, or death could
occur. Even with URPA, always
check behind the vehicle before
backing up. While backing, be
sure to look for objects and check
the vehicle's mirrors. The display is located in the
headliner.
URPA uses three color-coded lights
to provide distance and system
information.
How the System Works
URPA comes on automatically and
the display briefly illuminates to
indicate the system is working when
the shift lever is moved into
R (Reverse). If the vehicle is traveling faster then
8 km/h (5 mph) in reverse, the red
light on the rear display flashes.
Objects must be at least 20 cm
(8 in.) off the ground, below liftgate
level, and within 2.5 m (8 ft.) from
the rear bumper to be detected. The
distance may be less during warmer
or humid weather.
A single beep sounds the first time
an object is detected between 0.6 m
(23 in.) and 2.5 m (8 ft.) away.
Beeping occurs continuously when
the vehicle is 0.6 m (23 in.) or closer
to an object.

8-42 Driving and Operating
The following describes how the URPA display lights appear as the vehicle
gets closer to a detected object:Description Metric Englishamber light 2.5 m 8 ft.
amber/amber lights 1.0 m 40 in.
amber/amber/red lights and continuous beeping for five seconds 0.6 m 23 in.
amber/amber/red lights flashing and continuous beeping for five seconds 0.3 m 1 ft.
PARK ASSIST OFF displays on the
Driver Information Center (DIC) to
indicate that URPA is off, see Driver
Information Center (DIC)
on
page 4‑25for more information.
Turning the System On and Off
The URPA system can be turned on
and off using the park assist button
located next to the shift lever.
The park assist button lights up
when the system is on and turns off
when it has been disabled.
URPA defaults to the on setting
each time the vehicle is started.
When the System Does Not
Seem to Work Properly
If the URPA system does not
activate due to a temporary
condition, the message PARK
ASSIST OFF displays on the DIC
and a red light is shown on the rear
URPA display when the shift lever is
moved into R (Reverse). This can
occur under the following
conditions:
.The ultrasonic sensors are not
clean. Keep the vehicle's rear
bumper free of mud, dirt, snow,
ice and slush. For cleaning
instructions, see Exterior Care
on page 9‑82.
.A trailer was attached to the
vehicle, or an object was
hanging out of the trunk during
the last drive cycle, a red light
may come on in the rear display.
Once the attached object is
removed, URPA will return to
normal operation.