Page 242 of 454
ACC does not work below 25 mph
(40 km/h). It cannot bring your
vehicle to a complete stop.
ACC will not sound a beeper or
display a message on the multi-
inf ormation display to warn you of
vehicles going slower than 13 mph
(20 km/h) or vehicles that are
parked. In these cases, it is up to
you to maintain a safe distance by
using the brake pedal.
ACC may not recognize
motorcycles or other small
vehicles ahead of your vehicle.ACC may react to vehicles beside
you or even building beside you by
momentarily applying the brakes
or sounding a beeper under
conditions such as a sudden curve
or narrowing of the road, an
abrupt movement of the steering
wheel, or if you are in an unusual
position within your lane.
A daptive Cruise Control (A CC)
Limitations
Features
241
Page 244 of 454
When the speed is set, it is shown
along with a vehicle icon and
distance bars on the multi-
inf ormation display.
Refertopage forhowtosetand
change the set distance between
your vehicle and the vehicle ahead of
you.If you cancel ACC by pressing the
CANCEL button or by tapping the
brake pedal, the previously set
cruising speed is shown on the multi-
inf ormation display. To store this
speed as your new cruising speed,
press and release the RES/ACCEL
button.
If you change the speed unit
measurement f rom the f actory
def ault setting, the initial speed unit
measurement is shown under the
current unit.
To change the speed unit
measurement f rom mph to km/h,
see page . 246
89
A daptive Cruise Control (A CC)
Features
243
SET VEHICLE
SPEED
U.S.
CANADA CANADACANADA
U.S.
U.S.
PREVIOUSLY SET SPEED
SET VEHICLE
DISTANCE
INITIAL SPEED
UNIT
Page 246 of 454

CONT INUED
The set speed can be decreased
using the DECEL/SET button or the
brake pedal.
To decrease the set speed with the
DECEL/SET button, do this:
Press and hold the DECEL/SET
button. Release the button when you
reach the speed you want.
To slow down in small amounts, tap
the DECEL/SET button repeatedly.Each time you do this, your vehicle
slows down about 1 mph (1 km/h).
When the system detects a vehicle
ahead of you, a beeper sounds once
and a solid-line vehicle icon appears
on the multi-information display.
The set cruising speed will be shown
on the multi-information display.
On a steep downhill, the vehicle
speed may exceed the set cruising
speed.
To decrease the set speed with the
brake pedal, do this:
Tap the brake pedal. When the
vehicle slows down to the speed you
want, press the DECEL/SET button.
The set speed will be shown on the
multi-inf ormation display. If you use
the brake pedal to decrease speed,
andthenpresstheRES/ACCEL
button, your vehicle will return to the
previously set speed.
A daptive Cruise Control (A CC)
Decreasing the Set Speed
Detecting a Vehicle A head of You
Features
245
SET/DECEL BUTTONU.S.
CANADA
Page 248 of 454
Press the ACC button. The ACC
indicator in the instrument panel
goes off. Tap the brake pedal. Push the CANCEL button on the
steering wheel.If you cancel ACC by pressing the
ACC button, the previously set
cruising speed is erased f rom
memory.
The distance you select is also
shown on the multi-inf ormation
display.
ACC is canceled whenever you do
any of these actions:When you push the CANCEL button
or tap the brake pedal to cancel ACC,
the set cruising speed stays in
memory. When you turn on ACC
again, the speed is shown on the
multi-inf ormation display. To return
to that speed, accelerate to over 25
mph (40 km/h), then press the RES/
ACCEL button.
A daptive Cruise Control (A CC)
Canceling the A CC
Features
247
LONG
RANGE
MIDDLE
RANGE
SHORT
RANGE CANCEL BUTTON
U.S.
CANADA
U.S. CANADA
U.S.
CANADA
Page 251 of 454
MessageMessage
Description Description
ACC detects a vehicle ahead of you.
You will hear a beep when the vehicle
moves out of the ACC radar sensor’s
range.
ACC does not detect a vehicle ahead
of you.
You will hear a beep when ACC
detects a vehicle ahead of you.
ACC has automatically cancelled
because its radar sensor in the f ront
grill is dirty.
You will hear three beeps. ACC has automatically cancelled
because of bad weather or other
conditions.
You will hear three beeps.
Apply the brakes immediately.
Your vehicle is too close to the vehicle
ahead of it.
You will hear a continuous beep.
ACC needs to be checked.
Have your vehicle checked by a
dealer.
A daptive Cruise Control (A CC)
250
U.S.
U.S.
CANADA
CANADA
Page 278 of 454

OnStar uses the global positioning
system (GPS) to locate your vehicle
f or f unctions such as route guidance
and roadside assistance. GPS is
af f ected by structures that can
obstruct the signal, such as tunnels,
parking structures, and tall buildings.
It may not be possible f or OnStar to
pinpoint your location if you are in or
near such structures.
OnStar uses cellular technology to
communicate with your vehicle.
Cellular coverage varies by location,
which may af f ect the ability to
establish a connection, or the quality
of the connection.
Onstar has antennas in the rear
window (on each side of the high-
mount brake light) and on the roof
near the high-mount brake light. To
avoid reception problems, do not
cover the window antennas with
metal stickers, and do not cover theroof antenna with cargo or bicycles
on a roof rack.
When you turn of f your vehicle’s
ignition, OnStar goes into low-power
mode. Af ter 48 hours, it switches to
sleep mode to conserve your vehicle’s
battery power. Features such as
remote door unlocking and
misplaced vehicle assistance will not
work af ter your vehicle has been
parked f or more than 48 hours.
OnStar
is a registered trademark of
the OnStar Corporation.
As required by the FCC: This device
complies with Part 15 of the FCC rules.Operation is subject to the f ollowing twoconditions: (1) This device may notcause harmf ul interf erence, and (2) thisdevice must accept any interf erencereceived, including interf erence thatmay cause undesired operation.
Changes or modif ications not expresslyapproved by the party responsible f orcompliance could void the user’sauthority to operate the equipment.
This device complies with IndustryCanada Standard RSS-210. Operation issubject to the f ollowing two conditions:(1) this device may not causeinterf erence, and (2) this device mustaccept any interf erence that may causeundesired operation of the device.System Limitations
OnStar
Features
277
Page 297 of 454

Help assure your vehicle’s f uture
reliability and perf ormance by paying
extra attention to how you drive
during the f irst 600 miles (1,000 km).
During this period:Avoid full-throttle starts and rapid
acceleration.
Avoidhardbrakingforthefirst
200 miles (300 km).
Do not change the oil until the
scheduled maintenance time.
You should also f ollow these
recommendations with an
overhauled or exchanged engine, or
when the brakes are replaced. Do not tow a trailer. We recommend quality gasolines
containing detergent additives that
help prevent f uel system and engine
deposits.
In addition, in order to maintain good
perf ormance, f uel economy, and
emissions control, we strongly
recommend, in areas where it is
available, the use of gasoline that
does NOT contain manganese-based
f uel additives such as MMT.
Use of gasoline with these additives
may adversely af f ect perf ormance,
and cause the malfunction indicator
lamp on your instrument panel to
come on. If this happens, contact
your authorized dealer f or service.
Your vehicle is designed to operate
on premium unleaded gasoline with a
pump octane of 91 or higher. If this
octane grade is unavailable, regular
unleaded gasoline with a pump
octane of 87 or higher may be used
temporarily. The use of regular
unleaded gasoline can cause metallic
knocking noises in the engine and
will result in decreased engine
perf ormance. The long-term use of
regular-grade gasoline can lead to
engine damage.
Break-in Period
Fuel Recommendation
Break-in Period, Fuel Recommendation
296
Page 300 of 454

Park the vehicle, and set the
parking brake. Pull the hood
release lever located under the
lower lef t corner of the dashboard.
The hood will pop up slightly.
Turn the engine of f , and check or
retighten the f uel cap until it clicks at
least once. The MIL goes out af ter
several days of normal driving once
the cap is tightened or replaced. If it
does not go out, have your dealer
inspect the vehicle. For more
inf ormation, see page .
The TIGHTEN FUEL CAP message,
displayed after you turn the ignition
switch to the ON (II) position or
start the engine, should go of f af ter
tightening the f uel cap, turning the
ignition switch of f and on, then
driving over 12 mph (US) or 20
km/h (Canada) for at least 10
minutes. Due to dif f erent driving
conditions,itmaytakeafewdrive
trips to make the message go of f .
The TIGHTEN FUEL CAP message
displayed while driving should go of f
af ter tightening the f uel cap, turning
the ignition switch of f and on, then
driving over 30 mph (US) or 48
km/h (Canada) for at least 45
seconds. Due to dif f erent driving
conditions,itmaytakeafewdrive
trips to make the message go of f . If the system still detects a loose or
missing f uel cap, the malf unction
indicator lamp (MIL) comes on. If a
loose or missing f uel cap was not the
cause of the TIGHTEN FUEL CAP
message coming on, the MIL will
also come on. When the MIL comes
on, the message goes of f .
1.
410
CONT INUED
Opening and Closing the Hood
Service Station Procedures
Bef ore Driving
299
HOOD RELEASE LEVER