warning GMC SIERRA 1500 2012 User Guide

Black plate (10,1)GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
2-10 Keys, Doors, and Windows
The rear access door must be
closed before the front door can
close.
To open a rear access door from the
inside, first open the front door.
Then, use the handle located on the
inside of the rear access door
to open.
Tailgate
{WARNING
It is extremely dangerous to ride
on the tailgate, even when the
vehicle is operated at low speeds.
People riding on the tailgate can
easily lose their balance and
fall in response to vehicle
maneuvers. Falling from a moving
vehicle may result in serious
injuries or death. Do not allow
people to ride on the tailgate. Be
sure everyone in your vehicle is
in a seat and using a safety belt
properly.
On vehicles with a lock on the
tailgate, use the key to lock or
unlock the tailgate. Open the tailgate by lifting up
on its handle while pulling the
tailgate down.
To shut the tailgate, firmly push it
upward until it latches.
After closing the tailgate, pull it back
to be sure it latches securely.
Tailgate Removal
The tailgate can be removed to
allow for different loading situations.
Assistance may be needed with the
removal to avoid damage to the
vehicle.
On vehicles with a Rear Vision
Camera, it must be disconnected
before removing the tailgate. See
Rear Vision Camera (RVC) on
page 9‑62
for more information.

Black plate (14,1)GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
2-14 Keys, Doors, and Windows
4. Insert the new key to beprogrammed and turn it to the
ON/RUN position within
five seconds of turning the
ignition to the LOCK/OFF
position in Step 3.
The security light will turn off
once the key has been
programmed.
5. Repeat Steps 1 through 4 if additional keys are to be
programmed.
If you lose or damage your
PASS-Key III+ key, see your dealer
or a locksmith who can service
PASS-Key III+ to have a new
key made.
Do not leave the key or device
that disarms or deactivates the
theft-deterrent system in the vehicle.Exterior Mirrors
Convex Mirrors
{WARNING
A convex mirror can make things,
like other vehicles, look farther
away than they really are. If you
cut too sharply into the right lane,
you could hit a vehicle on the
right. Check the inside mirror or
glance over your shoulder before
changing lanes.
The passenger side mirror is convex
shaped. A convex mirror's surface is
curved so more can be seen from
the driver seat.
Manual Mirrors
If the vehicle has manual mirrors,
they can be adjusted by moving the
mirror up and down or left to right to
see a little of the side of the vehicle,
and have a clear view behind the
vehicle.
Using hood-mounted air deflectors
and add-on convex mirror
attachments could decrease mirror
performance.

Black plate (19,1)GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Keys, Doors, and Windows 2-19
Windows
{WARNING
Leaving children, helpless adults,
or pets in a vehicle with the
windows closed is dangerous.
They can be overcome by the
extreme heat and suffer
permanent injuries or even death
from heat stroke. Never leave a
child, a helpless adult, or a pet
alone in a vehicle, especially with
the windows closed in warm or
hot weather.
The vehicle aerodynamics are
designed to improve fuel economy
performance. This may result in apulsing sound when a window is
partially open. To reduce the sound,
open another window or the sunroof
(if equipped).
Manual Windows
Turn the hand crank on each door
to manually raise or lower the
manual windows.

Black plate (20,1)GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
2-20 Keys, Doors, and Windows
Power Windows
{WARNING
Leaving children in a vehicle with
the keys is dangerous for many
reasons. Children or others could
be badly injured or even killed.
They could operate the power
windows or other controls or even
make the vehicle move. The
windows will function and they
could be seriously injured or killed
if caught in the path of a closing
window. Do not leave keys in a
vehicle with children.
When there are children in the
rear seat use the window lockout
button to prevent unintentional
operation of the windows.
Crew Cab Premium Trim Shown,Others Models Similar
The driver door has a switch
to control all windows. Each
passenger door has a switch to
control that window. The power
windows only work when the
ignition is in ON/RUN or ACC/
ACCESSORY, or when Retained
Accessory Power (RAP) is active.
See Retained Accessory Power
(RAP) on page 9‑29. Push the switch down to lower the
window, and pull up the front of the
switch to raise the window.
Express-down Windows
The express-down feature allow the
driver and front passenger windows
to be lowered without holding the
switch. Push the switch down to the
second detent, then release, to
activate the express-down mode.
The express-down mode can be
canceled at any time by pulling up
on the front of the switch. To open
the window partway, push the switch
down to the first detent until the
window is at the desired position.

Black plate (2,1)GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
3-2 Seats and Restraints
Head Restraints
Front Seats
The front seats have adjustable
head restraints in the outboard
seating positions.
{WARNING
With head restraints that are not
installed and adjusted properly,
there is a greater chance that
occupants will suffer a neck/
spinal injury in a crash. Do not
drive until the head restraints for
all occupants are installed and
adjusted properly.
Adjust the head restraint so that the
top of the restraint is at the same
height as the top of the occupant's
head. This position reduces the
chance of a neck injury in a crash.The height of the head restraint can
be adjusted. Pull the head restraint
up to raise it. Try to move the head
restraint to make sure that it is
locked in place.
To lower the head restraint, press
the button, located on the top of the
seatback, and push the restraint
down. Try to move the head
restraint after the button is released
to make sure that it is locked in
place.
The front seat outboard head
restraints are not designed to be
removed.

Black plate (3,1)GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Seats and Restraints 3-3
Rear Seats
The rear seat has adjustable
headrests in the outboard seating
positions.
The height of the headrest can be
adjusted. Pull the headrest up to
raise it. To lower the headrest, push
down on the headrest.
Rear outboard headrests are not
designed to be removed.
Front Seats
Seat Adjustment
{WARNING
You can lose control of the
vehicle if you try to adjust a driver
seat while the vehicle is moving.
The sudden movement could
startle and confuse you, or make
you push a pedal when you do
not want to. Adjust the driver seat
only when the vehicle is not
moving.
To adjust the seat:
1. Lift the bar under the front edgeof the seat cushion to unlock
the seat.
2. Slide the seat to the desired position and release the bar.
3. Try to move the seat back and forth to be sure the seat is
locked in place.

Black plate (5,1)GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Seats and Restraints 3-5
Power Lumbar
To adjust the power lumbar support,
if equipped:
.On vehicles with two-way
lumbar, press and hold the top
or bottom of the control to
increase or decrease lumbar
support.
.On vehicles with four-way
lumbar, press and hold the front
or rear of the control to increase
or decrease lumbar support.To raise or lower the height of
the support, press and hold the
top or bottom of the control.
Reclining Seatbacks
{WARNING
Sitting in a reclined position when
the vehicle is in motion can be
dangerous. Even when buckled
up, the safety belts cannot do
their job.
The shoulder belt will not be
against your body. Instead, it will
be in front of you. In a crash, you
could go into it, receiving neck or
other injuries.
The lap belt could go up over
your abdomen. The belt forces
would be there, not at your pelvic
bones. This could cause serious
internal injuries.
(Continued)
WARNING (Continued)
For proper protection when the
vehicle is in motion, have the
seatback upright. Then sit well
back in the seat and wear the
safety belt properly.
Do not have a seatback reclined if
the vehicle is moving.

Black plate (6,1)GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
3-6 Seats and Restraints
Manual Reclining Seatbacks
{WARNING
If either seatback is not locked, it
could move forward in a sudden
stop or crash. That could cause
injury to the person sitting there.
Always push and pull on the
seatbacks to be sure they are
locked.
To adjust a manual seatback:
1. Lift the lever.The seatback will automatically
fold forward.
2. To recline, move the seatback rearward to the desired position,
then release the lever to lock the
seatback in place.
3. Push and pull on the seatback to make sure it is locked. To return the seatback to the upright
position:
1. Lift the lever fully without
applying pressure to the
seatback, and the seatback will
return to the upright position.
2. Push and pull on the seatback to make sure it is locked.

Black plate (9,1)GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Seats and Restraints 3-9
Heated and Ventilated
Front Seats
{WARNING
If you cannot feel temperature
change or pain to the skin, the
seat heater may cause burns
even at low temperatures. To
reduce the risk of burns, people
with such a condition should use
care when using the seat heater,
especially for long periods of
time. Do not place anything on
the seat that insulates against
heat, such as a blanket, cushion,
cover, or similar item. This
may cause the seat heater to
overheat. An overheated seat
heater may cause a burn or may
damage the seat.
Heated and Cooled Seat ButtonsShown, Heated Seat Buttons Similar
If available, the buttons are on the
front doors. To operate, the ignition
must be in ON/RUN.
H(Cooled Seat): If available,
press to cool the seat.
I(Heated Seatback): Press
to heat the seatback only.
J(Heated Seat and Seatback):
Press to heat the seat and
seatback. Press the button once for the
highest setting. With each press of
the button, the seat will change to
the next lower setting, and then to
the off setting. The lights indicate
three for the highest setting and one
for the lowest.
The passenger seat may take
longer to heat up.
On vehicles with heated seats,
the heated seats are canceled
10 seconds after the ignition is
turned off.
On vehicles with heated and cooled
seats, the heated and cooled seats
are canceled when the ignition is
turned off.
To use this feature after restarting
the vehicle, press the desired button
again.

Black plate (11,1)GMC Sierra Owner Manual - 2012 - CRC - 11/15/11
Seats and Restraints 3-11
To unfold the seat:
1. Push the seat cushion rearwardwhile pulling the release strap
under the seat cushion. Pull the
seat cushion down until it
latches.
2. Pull up on the seat cushion to make sure it is locked in place.
Make sure the safety belts are
not twisted or caught in the seat
cushion.
{WARNING
A safety belt that is improperly
routed, not properly attached,
or twisted will not provide the
protection needed in a crash. The
person wearing the belt could be
seriously injured. After raising the
rear seatback, always check to be
sure that the safety belts are
properly routed and attached, and
are not twisted.
Rear Seats (All Split
Bench and Hybrid Full
Bench)
Folding Rear Seat
Either side of the rear seat can be
folded for added cargo space.
Notice: Folding a rear seat with
the safety belts still fastened may
cause damage to the seat or the
safety belts. Always unbuckle the
safety belts and return them to
their normal stowed position
before folding a rear seat.
Make sure that nothing is on
the seat.
To fold the seat, slowly pull the seat
cushion up. To return the seat to the normal
seating position, slowly pull the seat
cushion down.
Make sure the safety belts are not
twisted or caught in the seat
cushion.
{WARNING
A safety belt that is improperly
routed, not properly attached,
or twisted will not provide the
protection needed in a crash. The
person wearing the belt could be
seriously injured. After raising the
rear seatback, always check to
be sure that the safety belts are
properly routed and attached, and
are not twisted.