2010 GMC TERRAIN Owner's Manual

Driving and Operating 8-41
Hill Start Assist (HSA)
This vehicle has a Hill Start Assist
(HSA) feature, which may be useful
when the vehicle is stopped on a
grade. This feature is designed to
prevent the vehicle from rolling,
either forward or rearward, during
vehicle drive off. After driver
completely stops and holds the
vehicle in a complete standstill on a
grade, HSA will be automatically
activated. During the transition
period between when the driver
releases the brake pedal and starts
to accelerate to drive off on a grade,
HSA holds the braking pressure to
ensure that there is no rolling back.
The brakes will automatically
release when the accelerator pedal
is applied within the two second
window. It will not activate if the
vehicle is in a drive gear and facing
downhill or if the vehicle is facing
uphill and in R (Reverse).
Ride Control Systems
Traction Control
System (TCS)
The vehicle has a Traction Control
System (TCS) that limits wheel spin.
On a front-wheel-drive vehicle, the
system operates if it senses that
one or both of the front wheels are
spinning or beginning to lose
traction. On an All-Wheel-Drive
(AWD) vehicle, the system will
operate if it senses that any of the
wheels are spinning or beginning to
lose traction. When this happens,
the system brakes the spinning
wheel(s) and/or reduces engine
power to limit wheel spin.
The system may be heard or felt
while it is working, but this is
normal.The TCS/StabiliTrak warning light
will flash to indicate that the traction
control system is active.
This warning light comes on if there
is a problem with TCS, and the
system will not limit wheel spin.
Adjust your driving accordingly.
TCS automatically comes on
whenever the vehicle is started.
To limit wheel spin, especially in
slippery road conditions, the system
should always be left on. But, TCS
can be turned off if needed.
Notice:Do not repeatedly brake
or accelerate heavily when TCS is
off. The vehicle's driveline could
be damaged.

8-42 Driving and Operating
The TCS off light comes on and
“Traction Control Off”is displayed
on the Driver Information Center
(DIC) to indicate that the traction
control system has been turned off.
See Ride Control System Messages
on page 4‑33.
On AWD vehicles, when TCS is
turned off, the system may still
make noise. This is normal and
necessary with AWD hardware.
It may be necessary to turn the
system off if the vehicle ever gets
stuck in sand, mud or snow and
rocking the vehicle is required. See
If the Vehicle is Stuck
on page 8‑22for more information. See also
Winter Drivingon page 8‑20for
information on using TCS when
driving in snowy or icy conditions.
Traction control can be turned off by
pressing and releasing the TCS/
StabiliTrak button, on the console,
until the TCS/StabiliTrak light comes
on the instrument panel and
“Traction Control Off” appears in the
DIC. Press the button again 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.
StabiliTrak System
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.

Driving and Operating 8-43
When the stability control system
activates, the Traction Control
System (TCS)/StabiliTrak light will
flash on the instrument panel. This
also occurs when traction control is
activated. A noise may be heard or
vibration may 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, a
“Service StabiliTrak”
message will be displayed on the
Driver Information Center (DIC).
When this message is displayed
and the StabiliTrak light comes on,
the system is not operational.
Driving should be adjusted
accordingly. See Ride Control
System Messages
on page 4‑33.
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 by
pressing and holding the TCS/
StabiliTrak button, on the console,
until the TCS Off and StabiliTrak Off
lights come on the instrument panel
and “StabiliTrak Off” appears in the
DIC. For information on turning TCS
off and on, see “Traction Control
System (TCS)” earlier in this
section.
If cruise control is being used when
StabiliTrak activates, the cruise
control will automatically disengage.
Press the cruise control button to
reengage when road conditions
allow. See Cruise Control
on
page 8‑44for more information.

8-44 Driving and Operating
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).
If the brakes are applied, the cruise
control shuts off.
If the vehicle has the StabiliTrak
®
system and begins to limit wheel
spin while using cruise control, the
cruise control automatically
disengages. SeeStabiliTrak System
on page 8‑42orTraction Control
System (TCS)on page 8‑41. When
road conditions allow you to safely
use it again, the cruise control can
be turned back on.
{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. 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.

Driving and Operating 8-45
5(On/Off):Press to turn the
cruise control system on and off.
\(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): Press the
thumbwheel to set a speed or move
the thumbwheel down to decrease
the speed. To set a speed:
1. Press
5.
2. Get to the speed desired.
3. Press the thumbwheel 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 brakes are applied while the
cruise control is at a set speed, the
cruise control disengages. But it
does not need to be reset.
Once the vehicle reaches about
40 km/h (25 mph) or more, move the
thumbwheel up toward RES/+
briefly. The vehicle returns to the
speed selected previously and stays
there. 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.

8-46 Driving and Operating
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 slows down to the previously
set cruise control speed.
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 go off.
.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.

Driving and Operating 8-47
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.
{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).

8-48 Driving and Operating
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.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.