seat adjustment GMC SIERRA 2015 Owner's Manual

Black plate (1,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
In Brief 1-1
In Brief
Instrument Panel
Instrument Panel . . . . . . . . . . . . . . 1-2
Initial Drive Information
Remote Keyless Entry (RKE)System . . . . . . . . . . . . . . . . . . . . . . 1-4
Remote Vehicle Start . . . . . . . . . 1-5
Door Locks . . . . . . . . . . . . . . . . . . . 1-5
Windows . . . . . . . . . . . . . . . . . . . . . . 1-6
Seat Adjustment . . . . . . . . . . . . . . 1-7
Memory Features . . . . . . . . . . . . . 1-8
Heated and Cooled Front Seats . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Head Restraint Adjustment . . . . 1-9
Safety Belts . . . . . . . . . . . . . . . . . . . 1-9
Passenger Sensing System . . . 1-9
Mirror Adjustment . . . . . . . . . . . . 1-10 Steering Wheel
Adjustment . . . . . . . . . . . . . . . . . 1-11
Throttle and Brake Pedal Adjustment . . . . . . . . . . . . . . . . . 1-12
Interior Lighting . . . . . . . . . . . . . . 1-12
Exterior Lighting . . . . . . . . . . . . . 1-13
Windshield Wiper/Washer . . . . 1-13
Climate Controls . . . . . . . . . . . . . 1-14
Transmission . . . . . . . . . . . . . . . . 1-15
Four-Wheel Drive . . . . . . . . . . . . 1-15
Vehicle Features
Infotainment System . . . . . . . . . 1-16
Steering Wheel Controls . . . . . 1-16
Cruise Control . . . . . . . . . . . . . . . 1-17
Driver Information Center (DIC) . . . . . . . . . . . . . . . 1-17
Forward Collision Alert (FCA) System . . . . . . . . . . . . . . . . . . . . . 1-18 Lane Departure
Warning (LDW) . . . . . . . . . . . . . 1-18
Rear Vision Camera (RVC) . . . . . . . . . . . . . 1-18
Parking Assist . . . . . . . . . . . . . . . 1-18
Power Outlets . . . . . . . . . . . . . . . 1-18
Universal Remote System . . . 1-19
Sunroof . . . . . . . . . . . . . . . . . . . . . . 1-19
Performance and Maintenance
Traction Control/Electronic
Stability Control . . . . . . . . . . . . 1-20
Tire Pressure Monitor . . . . . . . . 1-20
Engine Oil Life System . . . . . . 1-21
E85 or FlexFuel . . . . . . . . . . . . . . 1-21
Driving for Better Fuel Economy . . . . . . . . . . . . . . . . . . . 1-21
Roadside Assistance Program . . . . . . . . . . . . . . . . . . . . 1-22
OnStar
®. . . . . . . . . . . . . . . . . . . . . 1-22

Black plate (3,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
In Brief 1-3
1.Instrument Panel Illumination
Control on page 6-6.
2. Integrated Trailer Brake Control (ITBC) System (If Equipped).
See Towing Equipment on
page 9-78.
3. Exterior Lamp Controls on
page 6-1.
Fog Lamps on page 6-5 (If
Equipped).
4. Air Vents on page 8-4.
5. Turn Signal Lever. See Turn and
Lane-Change Signals on
page 6-4.
Windshield Wiper/Washer on
page 5-3.
6. Favorite Switches (Out of View). See Steering Wheel Controls on
page 5-2.
Volume Switches (Out of View).
See Steering Wheel Controls on
page 5-2.
7. Instrument Cluster on page 5-9. 8.
Hazard Warning Flashers on
page 6-4
9. Shift Lever. See Automatic
Transmission on page 9-33.
Tow/Haul Selector Button (If
Equipped). See Tow/Haul Mode
on page 9-39.
Range Selection Mode (If
Equipped). See Manual Mode on
page 9-36.
10. Light Sensor. See Automatic
Headlamp System on
page 6-3.
11. Infotainment on page 7-1.
12. Electronic Transfer Case Control (If Equipped). See
Four-Wheel Drive on
page 9-40.
13. Parking Brake on page 9-47.
14. Data Link Connector (DLC) (Out of View). See Malfunction
Indicator Lamp on page 5-18. 15.
Cruise Control on page 9-52.
Forward Collision Alert (FCA)
System on page 9-59 (If
Equipped).
16. Steering Wheel Adjustment on
page 5-2 (Out of View).
17. Horn on page 5-3.
18. Hood Release. See Hood on
page 10-4.
19. Steering Wheel Controls on
page 5-2 (If Equipped).
Driver Information Center (DIC)
Controls. See Driver
Information Center (DIC) on
page 5-27.
20. Heated and Cooled Front
Seats on page 3-7 (If
Equipped).
21. Dual Automatic Climate Control
System on page 8-1.

Black plate (7,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
In Brief 1-7
Power Sliding Rear Window
If equipped, the power sliding rear
window works when the ignition has
been turned to ACC/ACCESSORY
or ON/RUN, or when Retained
Accessory Power (RAP) is active.
SeeRetained Accessory Power
(RAP) on page 9-29.
.Press the switch to open the
window.
.Pull the switch down to close the
window.
The power sliding rear window
cannot be operated manually.
Seat Adjustment
Power Seats
To adjust a power seat:
.Move the seat forward or
rearward by sliding the control
forward or rearward.
.Raise or lower the front part of
the seat cushion by moving the
front of the control up or down.
.Raise or lower the seat by
moving the rear of the control up
or down. See
Power Seat Adjustment on
page 3-3.
Lumbar Adjustment
To adjust the power lumbar support:
.Press and hold the control
forward to increase or rearward
to decrease upper and lower
lumbar support at the same time.

Black plate (8,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
1-8 In Brief
.Press and hold the control up to
increase upper lumbar support
and decrease lower lumbar
support.
Press and hold the control down
to increase lower lumbar support
and decrease upper lumbar
support.
See Lumbar Adjustment on
page 3-3.
Reclining Seatbacks
To adjust the seatback:
.Tilt the top of the control
rearward to recline.
.Tilt the top of the control forward
to raise.
See Reclining Seatbacks on
page 3-4.
Memory Features
The SET, "1," "2," andB(Exit)
buttons on the driver door are used
to manually save and recall memory
settings for the driver seat, outside
mirrors, and adjustable pedals.
See Memory Seats on page 3-5 and
Vehicle Personalization on
page 5-42.
Heated and Cooled Front
Seats
The buttons are on the center stack.
To operate, the engine must be
running.

Black plate (9,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
In Brief 1-9
PressIto heat the driver or
passenger seatback only.
Press
Jto heat the driver or
passenger seat cushion and
seatback.
Press
Ato cool the driver or
passenger seat.
See Heated and Cooled Front Seats
on page 3-7.
Head Restraint
Adjustment
Do not drive until the head restraints
for all occupants are installed and
adjusted properly.
To achieve a comfortable seating
position, change the seatback
recline angle as little as necessary
while keeping the seat and the head
restraint height in the proper
position.
See Head Restraints on page 3-2
and Power Seat Adjustment on
page 3-3.
Safety Belts
Refer to the following sections for
important information on how to use
safety belts properly.
.Safety Belts on page 3-10.
.How to Wear Safety Belts
Properly on page 3-11.
.Lap-Shoulder Belt on page 3-12.
.Lower Anchors and Tethers for
Children (LATCH System) on
page 3-38.
Passenger Sensing
System
United States
Canada and Mexico
The passenger sensing system (if
equipped) turns off the front
outboard passenger frontal airbag
under certain conditions. No other
airbag is affected by the passenger
sensing system. See Passenger
Sensing System on page 3-24.

Black plate (11,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
In Brief 1-11
4. Press either (1) or (3) again todeselect the mirror.
See Power Mirrors on page 2-14.
If equipped with power folding
mirrors:
1. Press (2) to fold the mirrors out to the driving position.
2. Press (2) again to fold the mirrors in to the folded position.
See Folding Mirrors on page 2-16.
The mirrors may also include a
memory function that works with the
memory seats. See Memory Seats
on page 3-5.
Interior Mirror
Adjustment
Adjust the mirror for a clear view of
the area behind the vehicle. Automatic Dimming Rearview
Mirror
The automatic dimming mirror will
automatically reduce the glare from
the headlamps from behind. The
dimming feature comes on when the
vehicle is started.
See
Automatic Dimming Rearview
Mirror on page 2-19.
Steering Wheel
Adjustment
To adjust the tilt and telescoping
steering wheel:
1. Push the lever (1) down to move
the steering wheel forward or
rearward. Lift the lever up to lock
the wheel in place.
2. Pull the lever (2) toward you and release, to move the steering
wheel up or down.
The ignition may need to be set to
the ACC/ACCESSORY or ON/RUN
position to disengage the tilt and
telescoping steering column and
allow easier adjustment.
Do not adjust the steering wheel
while driving.

Black plate (1,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
Seats and Restraints 3-1
Seats and
Restraints
Head Restraints
Head Restraints . . . . . . . . . . . . . . . 3-2
Front Seats
Power Seat Adjustment . . . . . . . 3-3
Lumbar Adjustment . . . . . . . . . . . 3-3
Reclining Seatbacks . . . . . . . . . . 3-4
Memory Seats . . . . . . . . . . . . . . . . 3-5
Heated and Cooled FrontSeats . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Rear Seats
Rear Seats . . . . . . . . . . . . . . . . . . . . 3-9
Safety Belts
Safety Belts . . . . . . . . . . . . . . . . . . 3-10
How to Wear Safety BeltsProperly . . . . . . . . . . . . . . . . . . . . 3-11
Lap-Shoulder Belt . . . . . . . . . . . 3-12 Safety Belt Use During
Pregnancy . . . . . . . . . . . . . . . . . . 3-15
Safety Belt Extender . . . . . . . . . 3-15
Safety System Check . . . . . . . . 3-16
Safety Belt Care . . . . . . . . . . . . . 3-16
Replacing Safety Belt System Parts after a Crash . . . . . . . . . 3-16
Airbag System
Airbag System . . . . . . . . . . . . . . . 3-17
Where Are the Airbags? . . . . . 3-18
When Should an AirbagInflate? . . . . . . . . . . . . . . . . . . . . . 3-20
What Makes an Airbag Inflate? . . . . . . . . . . . . . . . . . . . . . 3-22
How Does an Airbag Restrain? . . . . . . . . . . . . . . . . . . . 3-22
What Will You See after an Airbag Inflates? . . . . . . . . . . . . 3-22
Passenger Sensing System . . . . . . . . . . . . . . . . . . . . . 3-24
Servicing the Airbag-Equipped Vehicle . . . . . . . . . . . . . . . . . . . . . 3-28 Adding Equipment to the
Airbag-Equipped Vehicle . . . 3-28
Airbag System Check . . . . . . . . 3-29
Replacing Airbag System Parts after a Crash . . . . . . . . . 3-30
Child Restraints
Older Children . . . . . . . . . . . . . . . 3-30
Infants and Young
Children . . . . . . . . . . . . . . . . . . . . 3-32
Child Restraint Systems . . . . . 3-35
Where to Put the Restraint . . . 3-37
Lower Anchors and Tethers for Children (LATCH
System) . . . . . . . . . . . . . . . . . . . . 3-38
Replacing LATCH System Parts After a Crash . . . . . . . . . 3-45
Securing Child Restraints (Rear Seat) . . . . . . . . . . . . . . . . . 3-45
Securing Child Restraints (Front Passenger Seat) . . . . 3-47

Black plate (3,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
Seats and Restraints 3-3
restraint and pull forward to the
desired locking position. To adjust
the head restraint rearward, grasp
the head restraint and pull forward
fully until the mechanism releases
and allows the head restraint to
return to the full rear position.
The front seat outboard head
restraints are not removable.
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
the headrest down.
If you are installing a child restraint
in the rear seat, see“Securing a
Child Restraint Designed for the
LATCH System” underLower
Anchors and Tethers for Children
(LATCH System) on page 3-38.
Front Seats
Power Seat Adjustment
To adjust a power seat:
.Move the seat forward or
rearward by sliding the control
forward or rearward.
.Raise or lower the front part of
the seat cushion by moving the
front of the control up or down.
.Raise or lower the seat by
moving the rear of the control up
or down. To adjust the setback, see
Reclining
Seatbacks on page 3-4.
To adjust the lumbar support, see
Lumbar Adjustment on page 3-3.
Some vehicles are equipped with a
feature that activates a vibrating
pulse alert in the driver seat to help
the driver avoid crashes. See Driver
Assistance Systems on page 9-55.
Lumbar Adjustment

Black plate (14,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
3-14 Seats and Restraints
Adjust the height so the shoulder
portion of the belt is on the shoulder
and not falling off of it. The belt
should be close to, but not
contacting, the neck. Improper
shoulder belt height adjustment
could reduce the effectiveness of
the safety belt in a crash. SeeHow
to Wear Safety Belts Properly on
page 3-11.
Push down on the release button to
move the height adjuster to the
desired position.
Move the adjuster up by pushing up
on the shoulder belt guide. After the adjuster is set to the
desired position, try to move it down
without pushing the release button
to make sure it has locked into
position.
Safety Belt Pretensioners
This vehicle has safety belt
pretensioners for front outboard
occupants. Although the safety belt
pretensioners cannot be seen, they
are part of the safety belt assembly.
They can help tighten the safety
belts during the early stages of a
moderate to severe frontal, near
frontal, or rear crash if the threshold
conditions for pretensioner
activation are met. And, if the
vehicle has side impact airbags,
safety belt pretensioners can help
tighten the safety belts in a side
crash. If the vehicle has rollover
capable roof-rail airbags, safety belt
pretensioners can help tighten the
safety belts in a rollover event.
Pretensioners work only once. If the
pretensioners activate in a crash,
they will need to be replaced, and
the vehicle’
s safety belt system will
probably need other new parts. See
Replacing Safety Belt System Parts
after a Crash on page 3-16.
Rear Safety Belt Comfort
Guides
{Warning
A safety belt that is not properly
worn may not provide the
protection needed in a crash. The
person wearing the belt could be
seriously injured. The shoulder
belt should go over the shoulder
and across the chest. These parts
of the body are best able to take
belt restraining forces.

Black plate (24,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
9-24 Driving and Operating
No adjustment to the pedals can be
made when the vehicle is in
R (Reverse) or while using cruise
control.
The switch used to adjust the
pedals is on the center stack, below
the climate controls.
Lift the switch up to move the
pedals closer to your body. Press
the switch down to move the
pedals away.Before you start driving, fully press
the brake pedal to confirm the
adjustment is right for you. While
driving, make only small
adjustments.
The vehicle may have a memory
function, which lets pedal settings
be saved and recalled. See
Memory
Seats on page 3-5.
Ignition Positions
Vehicles with Key Access have an
ignition switch with four different
positions. To shift out of P (Park), the ignition
must be in ON/RUN or ACC/
ACCESSORY and the regular brake
pedal must be applied.
1 (STOPPING THE ENGINE/LOCK/
OFF):
When the vehicle is stopped,
turn the ignition switch to LOCK/
OFF to turn the engine off. Retained
Accessory Power (RAP) will remain
active. See Retained Accessory
Power (RAP) on page 9-29.
This position locks the ignition and
steering wheel. It also locks the
transmission on automatic
transmission vehicles. The key can
be removed in LOCK/OFF.
The steering can bind with the
wheels turned off center. If this
happens, move the steering wheel
from right to left while turning the
key to ACC/ACCESSORY. If this
does not work, then the vehicle
needs service.