2010 GMC SIERRA DENALI ignition

Parking Brake
Set the parking brake by holding the regular brake
pedal down, then pushing down the parking brake
pedal.If the ignition is on, the brake system warning light will
come on. See
Brake System Warning Light
on
page 4‑34.
Notice: Driving with the parking brake on can
overheat the brake system and cause premature
wear or damage to brake system parts. Make sure
that the parking brake is fully released and the
brake warning light is off before driving.
To release the parking brake, hold the regular brake
pedal down, then push down momentarily on the
parking brake pedal until you feel the pedal release.
Slowly pull your foot up off the park brake pedal. If the
parking brake is not released when you begin to drive,
the brake system warning light will flash and a chime
will sound warning you that the parking brake is still on.
If you are towing a trailer and are parking on a hill, see
Towing a Trailer on page 5‑42.
3-34

Shifting Into Park
{WARNING:
It can be 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. 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, use the steps that follow.
If you are pulling a trailer, seeTowing a Trailer
on
page 5‑42
.
1. Hold the brake pedal down, then set the parking brake.
2. Move the shift lever into the P (Park) position by pulling the shift lever toward you and moving it up
as far as it will go.
3. Turn the ignition key to LOCK/OFF.
4. Remove the key and take it with you. If you can leave the vehicle with the ignition key in your hand,
the vehicle is in P (Park).
Leaving the Vehicle With the Engine
Running
{WARNING:
It can be dangerous to leave the vehicle with the
engine running. The vehicle could move suddenly
if the shift lever is not fully in P (Park) with the
parking brake firmly set. And, if you leave the
vehicle with the engine running, it could overheat
and even catch fire. You or others could be
injured. Do not leave the vehicle with the engine
running.
If you have to leave the vehicle with the engine running,
be sure the vehicle is in P (Park) and the parking brake
is firmly set. After the shift lever is moved into P (Park),
hold the regular brake pedal down. Then, see if you can
move the shift lever away from P (Park) without first
pulling it toward you. If you can, it means that the shift
lever was not fully locked into P (Park).
3-35

Torque Lock
If you are parking on a hill and you do not shift the
transmission into P (Park) properly, the weight of the
vehicle can put too much force on the parking pawl in
the transmission. It might be difficult to pull the shift
lever out of P (Park). This is called torque lock. To
prevent torque lock, set the parking brake and then shift
into P (Park) properly before you leave the driver seat.
To find out how, seeShifting Into Park on page 3‑35.
When you are ready to drive, move the shift lever out of
P (Park) before releasing the parking brake.
If torque lock does occur, you might need to have
another vehicle push yours a little uphill to take some of
the pressure from the parking pawl in the transmission.
Then you should be able to pull the shift lever out of
P (Park).
Shifting Out of Park
This vehicle is equipped with an electronic shift lock
release system. The shift lock release is designed to:
.Prevent ignition key removal unless the shift lever
is in P (Park) with the shift lever button fully
released, and
.Prevent movement of the shift lever out of P (Park),
unless the ignition is in ON/RUN or ACC/
ACCESSORY and the regular brake pedal is
applied. The shift lock release is always functional except in the
case of an uncharged or low voltage (less than 9 volt)
battery.
If the vehicle has an uncharged battery or a battery
with low voltage, try charging or jump starting the
battery. See
Jump Starting
on page 6‑44for more
information.
To shift out of P (Park) use the following:
1. Apply the brake pedal.
2. Move the shift lever to the desired position.
If you still are unable to shift out of P (Park): 1. Ease the pressure on the shift lever.
2. While holding down the brake pedal, press the shift lever all the way into P (Park).
3. Move the shift lever to the desired position.
If you are still having a problem shifting, then have the
vehicle serviced soon.
3-36

Mirrors
Manual Rearview Mirror
Hold the inside rearview mirror in the center to move it
for a clearer view behind your vehicle. Adjust the mirror
to avoid glare from the headlamps behind you. Push the
tab forward for daytime use and pull it for nighttime use.
Automatic Dimming Rearview Mirror
The vehicle may have an automatic dimming rearview
mirror.
Vehicles with OnStar
®have three additional control
buttons for the OnStar®system. See your dealer/retailer
for more information about OnStar®and how to
subscribe to it. See the OnStar®owner's guide for more
information about the services OnStar®provides.
O(On/Off): Press to turn the dimming feature on or off.
The vehicle may also have a Rear Vision Camera
(RVC). See Rear Vision Camera (RVC)
on page 3‑45for more information.
If the vehicle has RVC, the
O(On/Off) button for
turning the automatic dimming feature on or off will not
be available.
Automatic Dimming Mirror Operation
Automatic dimming reduces the glare from the
headlamps of the vehicle behind you. The dimming
feature comes on and the indicator light illuminates
each time the ignition is turned to start.
Cleaning the Mirror
Do not spray glass cleaner directly on the mirror. Use a
soft towel dampened with water.
3-39

Resetting the Power Foldaway Mirrors
Reset the power foldaway mirrors if:
.The mirrors are accidentally obstructed while
folding.
.They are accidentally manually folded/unfolded.
.The mirrors will not stay in the unfolded position.
.The mirrors vibrate at normal driving speeds.
Fold and unfold the mirrors one time using the mirror
controls to reset them to their normal position.
A popping noise may be heard during the resetting of
the power foldaway mirrors. This sound is normal after
a manual folding operation.
Automatic Dimming
The driver outside mirror adjusts for the glare of the
headlamps behind you. See Automatic Dimming
Rearview Mirror
on page 3‑39for more information.
Turn Signal Indicator
The vehicle may also have a turn signal indicator on the
mirror. An arrow on the mirror flashes in the direction of
the turn or lane change.
Park Tilt Mirrors
If the vehicle has the memory package, the passenger
and/or driver mirror tilts to a preselected position when
the vehicle is in R (Reverse). This feature lets the driver
view the curb when parallel parking. The mirror(s) return
to the original position when the vehicle is shifted out of
R (Reverse), or the ignition is turned off or to
OFF/LOCK.
Turn this feature on or off through the Driver Information
Center (DIC). See DIC Vehicle Customization (With DIC
Buttons)
on page 4‑67for more information.
3-41

To remove or install cargo tie-downs at the front of the
bed, slide the corner cap towards the center of the bed
to expose the rail notches. To remove the corner cap,
pull either edge away from the rail.
To remove the system, loosen the toggle bolts on each
rail until they can be removed from the bed of the truck.
To replace the system, place the toggle bolts and rails
into their original locations and tighten them to a torque
setting of 12.5 ft lbs (17Y).
If the system is removed to install a bed liner, make
sure there is no bed liner material in the installation
points.
Notice: If cargo is tied down using the horizontal
slots on the top of the pickup box, the box could be
damaged. Using the horizontal slots on the top of
the pickup box for tie-down locations may cause
damage to the pickup box and would not be
covered by the vehicle warranty. Only use the
tie-down loops if the vehicle does not have the
cargo management system.Sunroof
On vehicles with a power sliding sunroof, the ignition
needs to be turned to RUN, or the Retained Accessory
Power (RAP) must be activated to open or close the
sunroof. When RAP is active, the sunroof will work for
10 minutes after the ignition is turned off, or until the
driver's door is opened. See Retained Accessory Power
(RAP)
on page 3‑24for more information.
There are two sunroof
switches located in the
overhead console above
the rearview mirror.
Vent : From the closed position, press the rear of the
passenger's side switch to vent the sunroof. To close
the sunroof, press and hold the front of the passenger's
side switch.
3-61

Reducing Speed While Using Cruise
Control
To reduce the vehicle speed while using cruise control:
.Press and hold the SET–button on the steering
wheel until the desired lower speed is reached,
then release it.
.To slow down in very small amounts, press the
SET– button on the steering wheel 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
speed. When you take your foot off the pedal, the
vehicle will slow down to the previous set cruise speed.
Using Cruise Control on Hills
How well the cruise control works on hills depends upon
the vehicle speed, load, and the steepness of the hills.
While going up steep hills, you might have to step on
the accelerator pedal to maintain the vehicle's speed.
While going downhill, you might have to brake or shift to
a lower gear to keep the vehicle's speed down. When
the brakes are applied the cruise control turns off.
Ending Cruise Control
There are three ways to end cruise control:
.Step lightly on the brake pedal.
.Press[on the steering wheel.
.PressTon the steering wheel.
Erasing Speed Memory
The cruise control set speed memory is erased when
the cruise control or the ignition is turned off.
4-9

2(Headlamps) : Turns on the headlamps together with
the following:
.Parking Lamps
.Instrument Panel Lights
.Taillamps
.License Plate Lamps
When the headlamps are turned on while the vehicle is
on, the headlamps turn off automatically 10 minutes
after the ignition is turned off. When the headlamps are
turned on while the vehicle is off, the headlamps will
stay on for 10 minutes before automatically turning off
to prevent the battery from being drained. Turn the
headlamp control to off and then back to the headlamp
on position to make the headlamps stay on for an
additional 10 minutes.
Push the turn signal/multifunction lever toward the
instrument panel to change the headlamps from low
beam to high beam.
Headlamps on Reminder
A reminder chime will sound when the headlamps or
parking lamps are manually turned on and the ignition is
off, in LOCK/OFF, ACC/ACCESSORY, or a door is
open. Turn the light off, then back on, to stop the chime.
Daytime Running Lamps (DRL)
Daytime Running Lamps (DRL) can make it easier for
others to see the front of your vehicle during the day.
Fully functional daytime running lamps are required on
all vehicles first sold in Canada.
The DRL system comes on when the following
conditions are met:
.The ignition is on.
.The exterior lamps control is in AUTO.
.The engine is running.
.The light sensor determines it is daytime.
When the DRL system is on, only the DRL lamps are
on. The taillamps, sidemarker, instrument panel lights,
and other lamps will not be on.
When it begins to get dark, the automatic headlamp
system switches from DRL to the headlamps.
To turn off the DRL lamps, turn the exterior lamps
control to the OFF position and then release. For
vehicles first sold in Canada, the transmission must be
in the P (Park) position, before the DRL lamps can be
turned off.
4-11