warning GMC YUKON 2010 Repair Manual

Liftgate/Liftglass
{WARNING:
It can be dangerous to drive with the liftglass or
liftgate open because carbon monoxide (CO) gas
can come into your vehicle. You cannot see or
smell CO. It can cause unconsciousness and
even death.
If you must drive with the liftglass or liftgate open,
or if electrical wiring or other cable connections
must pass through the seal between the body and
the liftglass or liftgate:
.Make sure all other windows are shut.
.Turn the fan on your heating or cooling
system to its highest speed with the
recirculation mode off. That will force outside
air into your vehicle. SeeClimate Control
System
on page 4‑18or Dual Automatic
Climate Control System on page 4‑20.
(Continued)
WARNING: (Continued)
.If you have air outlets on or under the
instrument panel, open them all the way.
.If your vehicle has a power liftgate, disable the
power liftgate function.
See Engine Exhaust on page 3‑52.
If your vehicle has a power liftgate, see Power Liftgate
on page 3‑15.
To unlock the liftgate, use the power door lock switch or
press the door unlock button on the Remote Keyless
Entry (RKE) transmitter twice. See Remote Keyless
Entry (RKE) System Operation
on page 3‑5.
3-13

Power Liftgate
Power Liftgate Operation
{WARNING:
Exhaust gases can enter the vehicle if it is driven
with the liftgate, trunk/hatch open, or with any
objects that pass through the seal between the
body and the trunk/hatch or liftgate. Engine
exhaust contains Carbon Monoxide (CO) which
cannot be seen or smelled. It can cause
unconsciousness and even death.
If the vehicle must be driven with the liftgate,
or trunk/hatch open:
.Close all of the windows.
.Fully open the air outlets on or under the
instrument panel.(Continued)
WARNING: (Continued)
.Adjust the Climate Control system to a setting
that brings in only outside air and set the fan
speed to the highest setting. See Climate
Control System in the Index.
.If the vehicle is equipped with a power liftgate,
disable the power liftgate function.
For more information about carbon monoxide, see
Engine Exhaust on page 3‑52.
On vehicles with a power liftgate the button is located
on the overhead console.
The vehicle must be in P (Park) to use the power
liftgate feature.
&: Press the top of the button to open or close the
power liftgate.
3-15

OFF:Press the bottom of the button for manual
operation of the power liftgate.
The taillamps will flash and a chime will sound when the
power liftgate is moving.
{WARNING:
You or others could be injured if caught in the
path of the power liftgate. Make sure there is no
one in the way of the liftgate as it is opening and
closing.
Notice: If you open the liftgate without checking for
overhead obstructions such as a garage door, you
could damage the liftgate or the liftgate glass.
Always check to make sure the area above and
behind the liftgate is clear before opening it. The power liftgate can be power opened and closed in
the following ways:
.Press and hold the power liftgate button on the
Remote Keyless Entry (RKE) transmitter until the
liftgate starts moving.
Remote Keyless Entry (RKE)
System Operation
on page 3‑5for more
information.
.Pressing the liftgate button on the overhead
console.
.Pressing the touchpad switch on the outside
liftgate handle.
Pressing the buttons, or touchpad switch a second time
while the liftgate is moving reverses the direction.
l: The liftgate can also be closed by pressing the
power liftgate button next to the liftgate latch.
Press the button a second time during liftgate operation
to reverse that operation.
3-16

The power liftgate may be temporarily disabled under
extreme temperatures, or under low battery conditions.
If this occurs, the liftgate can still be operated manually.
If you shift the transmission out of P (Park) while the
power function is in progress, the liftgate power function
will continue to completion. If you shift the transmission
out of P (Park) and accelerate before the power liftgate
latches closed, the liftgate may reverse to the open
position. Cargo could fall out of the vehicle. Always
make sure the power liftgate is closed and latched
before you drive away.
If you power open the liftgate and the liftgate support
struts have lost pressure, the lights will flash and a
chime will sound. The liftgate will stay open temporarily,
then slowly close. See your dealer for service before
using the liftgate.Obstacle Detection Features
If the liftgate encounters an obstacle during a power
open or close cycle, a warning chime will sound and
the liftgate will automatically reverse direction to the full
closed or open position. After removing the obstruction,
the power liftgate operation can be used again. If the
liftgate encounters multiple obstacles on the same
power cycle, the power function will deactivate, and
you must manually open or close the liftgate. The
REAR ACCESS OPEN warning message in the Driver
Information Center (DIC) will indicate that the liftgate is
open. After removing the obstructions, manually open
the liftgate to the full open position or close the liftgate
to the fully closed and latched position. The liftgate will
now resume normal power operation.
Your vehicle has pinch sensors located on the side
edges of the liftgate. If an object is caught between
the liftgate and the body and presses against this
sensor, the liftgate will reverse direction and open fully.
The liftgate will remain open until it is activated again or
closed manually. Do not force the liftgate open or closed
during a power cycle.
3-17

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.
3-19

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.
The power window
switches are located on
the driver door.
In addition, each door has a switch for its own window.
The front power window switch operates with two
positions for both up and down movement and the rear
power window switch operates with one position for up
and two positions for down movement. Press the switch
to the first position to lower the window to the desired
level. Pull the switch up to raise the window.
The vehicle has Retained Accessory Power (RAP) that
allows you to use the power windows once the ignition
has been turned off. For more information, see Retained
Accessory Power (RAP) on page 3‑29.
3-20

Express-Down/Up Windows
Windows with the express feature allow the windows to
be raised and lowered all the way without holding the
switch.
Press or pull the switch fully and release it to activate
the express feature.
The express mode can be canceled at any time by
briefly pressing or pulling the switch.
Express Window Anti-Pinch Feature
If any object is in the path of the window when the
express‐up is active, the window will stop at the
obstruction and auto‐reverse to a preset factory
position. Weather conditions such as severe icing
may also cause the window to auto‐reverse.
The window will return to normal operation once
the obstruction or condition is removed.
Express Window Anti‐Pinch Override
{WARNING:
If express override is activated, the window will
not reverse automatically. You or others could
be injured and the window could be damaged.
Before you use express override, make sure
that all people and obstructions are clear of the
window path.
In an emergency, the anti‐pinch feature can be
overridden in a supervised mode. Hold the window
switch all the way up to the second position.
The window will rise for as long as the switch is
held. Once the switch is released, the express
mode is re‐activated.
In this mode, the window can still close on an object in
its path. Use care when using the override mode.
3-21

B (ACC/ACCESSORY):This position lets things like
the radio and the windshield wipers operate while the
engine is off. Use this position if the vehicle must be
pushed or towed.
C (ON/RUN): This position can be used to operate the
electrical accessories and to display some instrument
panel cluster warning and indicator lights. The switch
stays in this position when the engine is running.
The transmission is also unlocked in this position
on automatic transmission vehicles.
If you leave the key in the ACC/ACCESSORY or
ON/RUN position with the engine off, the battery could
be drained. You may not be able to start the vehicle if
the battery is allowed to drain for an extended period
of time.
D (START): This is the position that starts the engine.
When the engine starts, release the key. The ignition
switch returns to ON/RUN for driving.
A warning tone will sound when the driver door is
opened, the ignition is in ACC/ACCESSORY or
LOCK/OFF and the key is in the ignition.Retained Accessory Power (RAP)
The following vehicle accessories can be used for up to
10 minutes after the engine is turned off:
.Audio System
.Power Windows
.OnStar®System (if equipped)
.Sunroof (if equipped)
These features work when the key is in ON/RUN
or ACC/ACCESSORY. Once the key is turned from
ON/RUN to LOCK/OFF, the windows and sunroof
continue to work up to 10 minutes until any door
is opened. The radio continues to work for up to
10 minutes or until the driver door is opened.
Starting the Engine
If the vehicle is a Two-mode Hybrid, see the Two-mode
Hybrid manual for more information.
Move the shift lever to P (Park) or N (Neutral).
The engine will not start in any other position. To restart
the engine when the vehicle is are already moving,
use N (Neutral) only.
Notice: Do not try to shift to P (Park) if the
vehicle is moving. If you do, you could damage
the transmission. Shift to P (Park) only when the
vehicle is stopped.
3-29

To Use the Engine Coolant Heater
1. Turn off the engine.
2. Open the hood and unwrap the electrical cord.The cord is secured to the Engine Compartment
Fuse Block with a clip. Carefully remove the wire
tie which secures the electrical cord. Do not cut the
electrical cord.
3. Plug the cord into a normal, grounded 110-volt AC outlet.{WARNING:
Plugging the cord into an ungrounded outlet could
cause an electrical shock. Also, the wrong kind of
extension cord could overheat and cause a fire.
You could be seriously injured. Plug the cord into
a properly grounded three-prong 110-volt AC
outlet. If the cord will not reach, use a heavy-duty
three-prong extension cord rated for at least
15 amps.
4. Before starting the engine, be sure to unplug and store the cord as it was before to keep it away from
moving engine parts. If you do not, it could be
damaged.
The length of time the heater should remain plugged
in depends on several factors. Ask a dealer in the area
where you will be parking the vehicle for the best advice
on this.
3-32

Heavy Duty 6-Speed Automatic Transmission Shown(Light Duty Similar)
See “Range Selection Mode” later in this section.
P (Park): This position locks the rear wheels. It is the
best position to use when starting the engine because
the vehicle cannot move easily. When parked on a hill,
especially when the vehicle has a heavy load, you
might notice an increase in the effort to shift out of
P (Park). See Torque Lock (Automatic Transmission)
under Shifting Into Park
on page 3‑49for more
information.
{WARNING:
It is dangerous to get out of the vehicle if the shift
lever is not fully in P (Park) with the parking brake
firmly set. The vehicle can roll.
Do not leave the 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 the
vehicle will not move, even when you are on fairly
level ground, always set the parking brake and
move the shift lever to P (Park). See Shifting Into
Park
on page 3‑49. If you are pulling a trailer,
see Towing a Trailer on page 5‑49.
3-34