2007 BUICK TERRAZA brakes

Automatic Transaxle Operation
Maximum engine speed is limited when you are in
PARK (P) or NEUTRAL (N), to protect driveline
components from improper operation.
There are several different positions for your shift
lever.
PARK (P):This gear position locks your front
wheels. It is the best position to use when you start
your engine because your vehicle cannot move
easily.
Make sure the shift lever is fully in PARK (P)
before starting the engine. Your vehicle has an
automatic transaxle shift lock control system. You
must fully apply your regular brakes rst and
then press the shift lever button before you can
shift from PARK (P) when the ignition key is
in RUN. If you cannot shift out of PARK (P), easepressure on the shift lever and push the shift lever
all the way info PARK (P) as you maintain
brake application. Then press the shift lever button
and move the shift lever into another gear. See
Shifting Out of Park (P) on page 139.
{CAUTION:
It is dangerous to get out of your vehicle
if the shift lever is not fully in PARK (P)
with the parking brake rmly set. Your
vehicle can roll.
Do not leave your vehicle when the engine
is running unless you have to. If you have
left the engine running, the vehicle can
move suddenly. You or others could be
injured. To be sure your vehicle will not
move, even when you are on fairly level
ground, always set your parking brake
and move the shift lever to PARK (P). See
Shifting Into Park (P) on page 138.Ifyou
are pulling a trailer, seeTowing a Trailer
on page 386.
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DRIVE (D):This position is for normal driving. It
provides the best fuel economy for your vehicle. If
you need more power for passing, and you are:
Going less than 35 mph (55 km/h), push
your accelerator pedal about halfway down.
Going about 35 mph (55 km/h) or more, push
the accelerator all the way down.
The vehicle will shift down to the next gear
and have more power.
Downshifting the transaxle in slippery road
conditions could result in skidding, see Skidding
underLoss of Control on page 362
Notice:If your vehicle seems to start up
rather slowly or not shift gears when you go
faster, and you continue to drive your vehicle
that way, you could damage the transaxle.
Have your vehicle serviced right away. You can
drive in SECOND (2) when you are driving
less than 35 mph (55 km/h) and DRIVE (D) for
higher speeds until then.
Warm-Up Shift
Your vehicle has a computer controlled transaxle
designed to warm up the engine faster when
the outside temperature is 35°F (2°C) or colder.
You may notice that the transaxle will shift at
a higher vehicle speed until the engine is warmed
up. This is a normal condition designed to
provide heat to the passenger compartment and
defrost the windows more quickly. SeeClimate
Control System on page 193andDual Climate
Control System on page 197for more information.
THIRD (3):This position is also used for normal
driving. It reduces vehicle speed more than
DRIVE (D) without using your brakes. You might
choose THIRD (3) instead of DRIVE (D) when
driving on hilly, winding roads, when towing
a trailer, so there is less shifting between gears
and when going down a steep hill.
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SECOND (2):This position reduces vehicle speed
more than DRIVE (D) without using your brakes.
You can use SECOND (2) on hills. It can help
control your speed as you go down steep mountain
roads, but then you would also want to use your
brakes off and on.
Notice:Driving in SECOND (2) for more than
25 miles (40 km) or at speeds over 55 mph
(90 km/h) may damage the transaxle. Also,
shifting into SECOND (2) at speeds above
65 mph (105 km/h) can cause damage. Drive in
THIRD (3) or DRIVE (D) instead of SECOND (2).
Notice:If your vehicle seems to start up rather
slowly, or if it seems not to shift gears as you
go faster, something may be wrong with a
transaxle system sensor. If you drive very far
that way, your vehicle can be damaged. So, if
this happens, have your vehicle serviced right
away. Until then, you can use SECOND (2) when
you are driving less than 35 mph (55 km/h) and
THIRD (3) for higher speeds.FIRST (1):This position reduces vehicle speed
even more than SECOND (2) without using your
brakes. You can use it on very steep hills, or in
deep snow or mud. If the shift lever is put in
FIRST (1) while the vehicle is moving forward, the
transaxle will not shift into rst gear until the vehicle
is going slowly enough.
Notice:Spinning the tires or holding the
vehicle in one place on a hill using only the
accelerator pedal may damage the transaxle. If
you are stuck, do not spin the tires. When
stopping on a hill, use the brakes, or parking
brake to hold the vehicle in place.
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Torque Lock
If you are parking on a hill and you do not shift
your vehicle into PARK (P) properly, the weight of
the vehicle may put too much force on the
parking pawl in the transaxle. You may nd it
difficult to pull the shift lever out of PARK (P). This
is called torque lock. To prevent torque lock,
set the parking brake and then shift into PARK (P)
properly before you leave the driver’s seat. To
nd out how, seeShifting Into Park (P) on
page 138.When you are ready to drive, move the shift lever
out of PARK (P) before you release the parking
brake.
If torque lock does occur, you may need to have
another vehicle push yours a little uphill to
take some of the pressure from the parking pawl
in the transaxle, so you can pull the shift lever
out of PARK (P).
Shifting Out of Park (P)
Your vehicle has an automatic transaxle shift lock
control system which locks the shift lever in
PARK (P) when the ignition is in the LOCK position.
In addition, you must fully apply your regular brakes
before you can shift from PARK (P) when the
ignition is in RUN. SeeAutomatic Transaxle
Operation on page 133.
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Cruise control allows a speed of approximately
25 mph (40 km/h) or more to be maintained
without keeping your foot on the accelerator. This
is helpful on long trips. Cruise control does not
work at speeds below about 25 mph (40 km/h).
When the brakes are applied, the cruise control
shuts off.
If the vehicle is in cruise control and the Traction
Control System (TCS) begins to limit wheel
spin, the cruise control will automatically
disengage. SeeTraction Control System (TCS)
on page 353. When road conditions allow,
the cruise control can be used again.Setting Cruise Control
{CAUTION:
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.
1. Push the button at the end of the cruise
control lever to turn the cruise control on.
2. Accelerate to the desired speed.
3. Push down on the cruise control lever and
release it. This will set the speed in cruise
control.
4. Remove your foot from the accelerator pedal.
This symbol will appear
on the instrument panel
cluster when the
cruise control is set.
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This symbol will disappear when the brakes are
applied or the cruise control is cancelled. It will
reappear when the set cruise speed is resumed.
Resuming a Set Speed
If the cruise control is set at a desired speed and
then the brakes are applied, the cruise control shuts
off. But the cruise control does not need to be reset.
Once the vehicle is traveling approximately
25 mph (40 km/h) or more, the cruise control
lever can be pushed upward toward the plus
(resume/accelerate) position to return to the
preset cruise speed.
The vehicle will return to and stay at the preset
cruise speed. If the cruise control lever is pushed
up and held toward the plus (resume/accelerate)
position, the vehicle speed will increase until the
lever is released or the brakes are applied.
Do not continue to hold the lever in the plus
(resume/accelerate) position, unless a faster
speed is desired.
Increasing Speed While Using
Cruise Control
There are two ways to go to a higher speed:
Use the accelerator pedal to get to the higher
speed. Push up on the cruise control lever
toward the plus (resume/accelerate) position,
then release the lever and take your foot
off the accelerator pedal. The vehicle will now
cruise at the higher speed.
Push up and hold the cruise control lever
toward the plus (resume/accelerate) position
until the vehicle reaches the desired speed.
Then release the cruise control lever. To
increase the vehicle’s speed in very small
amounts, push up briey on the cruise control
lever and release it. Each time this is done,
the vehicle will speed up approximately
one mph (1.6 km/h).
The acceleration feature will only work after the
cruise control speed has been set by pushing the
cruise control lever down to the set position.
179

Reducing Speed While Using
Cruise Control
There are two ways to reduce the vehicle’s speed
while using cruise control:
Push the cruise control lever downward toward
the minus (set/coast/decelerate) position until
a lower speed is reached, then release it.
To slow down in very small amounts, push
the cruise control lever downward toward the
minus (set/coast/decelerate) position briey.
Each time this is done, the vehicle will slow
down approximately one mph (1.6 km/h).
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 cruise control
speed set earlier.
Using Cruise Control on Hills
How well the cruise control will work on hills
depends upon the vehicle’s speed, its load, and
the steepness of the hills. When going up steep
hills, the accelerator pedal might have to be
used in order to maintain the vehicle’s speed.When going downhill, the brakes might have to be
applied, or the transaxle might have to be shifted
to a lower gear to keep the vehicle’s speed down.
Doing either of these things will take the vehicle out
of cruise. It may be better not to use the cruise
control if the brakes constantly have to be applied,
or the vehicle continuously needs to be shifted to
a lower gear.
Cancelling Cruise Control
To cancel a cruise control session, pull the cruise
control lever forward, or step lightly on the
brake pedal.
Doing either of these things will only end the
current cruise control session, but the set speed
will be retained in memory.
Push the button at the end of the cruise control
lever to turn the system off.
Erasing Speed Memory
When the cruise control or the ignition is turned
off, the cruise control set speed memory is erased.
180

How the System Works
Unless disabled, the URPA will turn on
automatically when the shift lever is moved into
REVERSE (R). When the system turns on, the
three lights on the display will illuminate for one and
a half seconds to let you know that the system is
working. If your vehicle is moving in REVERSE (R)
at a speed greater than 3 mph (5 km/h), the red
light will ash to remind you that the system does
not work at speed greater than 3 mph (5 km/h).
If an object is detected at a REVERSE (R) speed
of less than 3 mph (5 km/h), one of the following
will occur:
Description English Metric
amber light 5 ft 1.5 m
amber/amber lights 40 in 1.0 m
amber/amber/red lights &
continuous chime20 in 0.5 m
amber/amber/
red lights ashing &
continuous chime1 ft 0.3 m
A chime will sound the rst time an object
is detected between 20 inches (0.5 m) and
5 feet (1.5 m) away.URPA cannot detect objects that are above liftgate
level. In order for the rear sensors to recognize
an object, it must be within detection range behind
the vehicle.
When the System Does Not Seem to
Work Properly
The light may ash red when the vehicle is in
REVERSE (R) if the ultrasonic sensors are
not kept clean. So be sure to keep your rear
bumper free of mud, dirt, snow, ice and slush.
Other conditions that may affect system
performance include things like the vibrations from
a jackhammer or the compression of air brakes
on a very large truck. If after cleaning the
rear bumper and then driving forward at least
15 mph (25 km/h), the display continues to ash
red, see your dealer.
If a trailer was attached to your vehicle, or a
bicycle or an object was on the back of, or hanging
out of your liftgate during your last drive cycle,
the light may also ash red. The light will continue
to ash whenever in REVERSE (R) until your
vehicle is driven forward at least 15 mph (25 km/h)
without any obstructions behind the vehicle.
190