ECU GMC SIERRA 2019 Owner's Manual

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - CRC - 5/13/19
Keys, Doors, and Windows 31
Keys, Doors, and
Windows
Keys and Locks
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Remote Keyless Entry (RKE)System . . . . . . . . . . . . . . . . . . . . . . . 34
Remote Keyless Entry (RKE) System Operation (Keyless
Access) . . . . . . . . . . . . . . . . . . . . . . 34
Remote Keyless Entry (RKE) System Operation (Key
Access) . . . . . . . . . . . . . . . . . . . . . . 42
Remote Vehicle Start . . . . . . . . . . 44
Door Locks . . . . . . . . . . . . . . . . . . . . 45
Power Door Locks . . . . . . . . . . . . . 46
Delayed Locking . . . . . . . . . . . . . . . 46
Automatic Door Locks . . . . . . . . . 47
Lockout Protection . . . . . . . . . . . . . 47
Safety Locks . . . . . . . . . . . . . . . . . . . 47
Doors
Tailgate . . . . . . . . . . . . . . . . . . . . . . . . 48
Power Assist Steps . . . . . . . . . . . . 54
Vehicle Security
Vehicle Security . . . . . . . . . . . . . . . . 55
Vehicle Alarm System . . . . . . . . . 55
Immobilizer . . . . . . . . . . . . . . . . . . . . 56 Immobilizer Operation . . . . . . . . . 56
Exterior Mirrors
Convex Mirrors . . . . . . . . . . . . . . . . 57
Manual Mirrors . . . . . . . . . . . . . . . . . 57
Power Mirrors . . . . . . . . . . . . . . . . . . 58
Folding Mirrors . . . . . . . . . . . . . . . . . 58
Heated Mirrors . . . . . . . . . . . . . . . . . 59
Automatic Dimming Mirror . . . . . 59
Blind Spot Mirrors . . . . . . . . . . . . . . 59
Reverse Tilt Mirrors . . . . . . . . . . . . 60
Interior Mirrors
Interior Rearview Mirrors . . . . . . . 61
Manual Rearview Mirror . . . . . . . . 61
Automatic Dimming Rearview
Mirror . . . . . . . . . . . . . . . . . . . . . . . . . 61
Rear Camera Mirror . . . . . . . . . . . . 61
Windows
Windows . . . . . . . . . . . . . . . . . . . . . . . 63
Manual Windows . . . . . . . . . . . . . . 64
Power Windows . . . . . . . . . . . . . . . 64
Rear Windows . . . . . . . . . . . . . . . . . 66
Sun Visors . . . . . . . . . . . . . . . . . . . . . 66
Roof
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . 66
Keys and Locks
Keys
{Warning
Leaving children in a vehicle with
the ignition key is dangerous and
children or others could be
seriously injured or killed. They
could operate the power windows
or other controls or make the
vehicle move. The windows will
function with the keys in the
ignition, and children or others
could be caught in the path of a
closing window. Do not leave
children in a vehicle with the
ignition key.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - CRC - 5/13/19
Keys, Doors, and Windows 33
Interference from radio-frequency
identification (RFID) tags may
prevent the key from starting the
vehicle. Keep RFID tags away from
the key when starting the vehicle.
The key is used for the ignition, all
door locks, and the glove box.
If equipped with memory seats,
keys 1 and 2 are linked to seating
positions of memory 1 or 2. See
Memory Seats074.
Programming Keys
Follow these procedures to program
up to eight keys to the vehicle. Programming with Two
Recognized Keys
To program a new key:
1. Insert the original, already programmed key in the ignition
and turn the ignition on.
2. Turn the ignition off, and remove the key.
3. Quickly, within five seconds, insert the second original
already programmed key in the
ignition and turn the ignition on.
4. Turn the ignition off, and remove the key.
5. Insert the key to be programmed and turn the
ignition on within five seconds.
6. After a few seconds, the security light will turn off once
the key has been programmed.
7. Repeat Steps 1–5 if additional keys are to be programmed.
If a key is lost or damaged, see your
dealer to have a new key made. Programming without
Recognized Keys
Program a new key to the vehicle
when a recognized key is not
available. Canadian regulations
require that owners see their dealer.
If two currently recognized keys are
not available, follow this procedure
to program the first key.
This procedure will take
approximately 30 minutes to
complete for the first key. The
vehicle must be off and all of the
keys you wish to program must be
with you.
1. Insert the new vehicle key into the ignition.
2. Turn the ignition on. The security light will come on.
3. Wait 10 minutes until the security light turns off.
4. Turn the ignition off.
5. Repeat Steps 2–4 two more times. After the third time, turn
the ignition on; the key is

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - CRC - 5/13/19
Keys, Doors, and Windows 49
After closing the tailgate, pull it back
to be sure it is latched securely.
Some tailgates have an electric
latch. If the battery is disconnected
or has low voltage, the tailgate will
not open. The tailgate will resume
operation when the battery is
reconnected or recharged.
Power Release Tailgate
{Warning
Make sure there is no one in the
way of the power tailgate as it is
opening and closing, and keep
hands away from the tailgate
hinges when in use. You or others
could be injured if caught in the
path of the power tailgate or
tailgate hinges.
Caution
To avoid damage to the tailgate,
make sure the area behind the
tailgate is clear before opening it.In the case of a dead battery, the
tailgate can be opened manually.
Contact your dealer or Roadside
Assistance.
If equipped, to lock or unlock the
tailgate, use the RKE transmitter or
the key. See
Remote Keyless Entry
(RKE) System Operation (Keyless
Access) 034 or
Remote Keyless Entry (RKE)
System Operation (Key Access)
0 42.
The vehicle must be in P (Park).
To open the tailgate:
. Press
xtwice quickly on the
RKE transmitter until the tailgate
moves.
. Press5on the center stack.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - CRC - 5/13/19
50 Keys, Doors, and Windows
.Press the touch pad on the
tailgate handle after unlocking all
doors. Use the top of the tailgate
to pull against if assistance is
required. If equipped with
Keyless Access, a locked
tailgate can be opened if the
RKE transmitter is within
1 m (3 ft).
To close the tailgate, firmly push it
upward until it latches. Pull it back
to be sure it is latched securely.
MultiPro Tailgate
{Warning
Make sure there is no one in the
way of the power tailgate as it is
opening and closing, and keep
hands away from the tailgate
hinges when in use. You or others
could be injured if caught in the
path of the power tailgate or
tailgate hinges.
Caution
To avoid damage to the tailgate,
make sure the area behind the
tailgate is clear before opening it.
If equipped with this feature, the
vehicle must be in P (Park).
Switches in the inner tailgate
prevent the primary tailgate from
being opened when the inner
tailgate is not fully closed. To open the primary tailgate:
.
Pressxtwice quickly on the
RKE transmitter until the tailgate
moves. See Remote Keyless
Entry (RKE) System Operation
(Keyless Access) 034 or
Remote Keyless Entry (RKE)
System Operation (Key Access)
0 42. If equipped with Keyless
Access, the tailgate can be
opened if the RKE transmitter is
within 1 m (3 ft).

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - CRC - 5/13/19
Keys, Doors, and Windows 51
.Press5on the center stack.
. Press the lower touch pad on
the tailgate handle after
unlocking all doors. Use the top
of the tailgate to pull against if
assistance is required.
To close the primary tailgate, firmly
push it upward until it latches. Pull it
back to be sure it is latched
securely.To open the inner tailgate, press the
upper touch pad on the tailgate
handle after unlocking all doors. Pull
the top of the tailgate to open.
Caution
Do not open the inner tailgate
with the primary tailgate open if
there is a hitch ball or trailer
attached. This may damage the
tailgate.
To close the inner tailgate with the
primary tailgate closed, firmly push
or pull it upward until it latches. Pull
it back to be sure it is latched
securely.
To close the inner tailgate with the
primary tailgate open:
. Hold the primary tailgate and
firmly close the inner tailgate.
. Raise the inner tailgate so it
meets the primary tailgate and
close together at the same time.
When using the tailgate step as a
load stop, the load must be secured
as the load could shift. See Cargo
Tie-Downs 0129.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - CRC - 5/13/19
Keys, Doors, and Windows 53
The assist handle helps with
entering the pickup box. To use:1. Lift up on the handle until it locks in the open position.
2. To return the assist handle, pull the release lever toward the
ball end of the handle and push
the handle back to the closed
position.
Applying Loads to Tailgates
Caution
Do not put ramp loads on the
inner tailgate alone. Damage to
the inner tailgate may occur.
Preferred MethodAlternate Method
When applying any load to the
tailgate, distribute the weight evenly
across the width of the tailgate. This
applies to all tailgate types.
. Use a load-distributing
member (1).
. Secure the ramp to the
bumper (2).

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - CRC - 5/13/19
Keys, Doors, and Windows 55
.Pressjagain to return to
normal operation.
Enable/Disable
To enable or disable the power
assist steps, press and hold
jfor
four seconds. A DIC message
displays.
Cleaning
Clean the power assist steps
regularly. For an automatic car
wash, extend the steps while in
N (Neutral) using the center stack
switch. The steps will stow when
shifting into D (Drive).
Vehicle Security
This vehicle has theft-deterrent
features; however, they do not make
the vehicle impossible to steal.
Vehicle Alarm System
The indicator light, on the
instrument panel near the
windshield, indicates the status of
the system.
Off : Alarm system is disarmed.
On Solid : Vehicle is secured
during the delay to arm the system. Fast Flash :
Vehicle is unsecured.
A door or the hood is open.
Slow Flash : Alarm system is
armed.
Arming the Alarm System
1. Turn off the vehicle.
2. Lock the vehicle in one of two ways:
.Use the RKE transmitter.
. With a door open, press
Q
on the interior of the door.
3. After 30 seconds, the alarm system will arm and the
indicator light will begin to
slowly flash. Pressing
Qon the
RKE transmitter a second time
will bypass the 30-second
delay and immediately arm the
alarm system.
The vehicle alarm system will not
arm if the doors are locked with
the key.
If the driver door is opened without
first unlocking with the RKE
transmitter, the horn will chirp and

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - CRC - 5/13/19
56 Keys, Doors, and Windows
the lights will flash to indicate
pre-alarm. If the vehicle is not
started, or the door is not unlocked
by pressing
Kon the RKE
transmitter during the 10-second
pre-alarm, the alarm will be
activated.
The alarm will also be activated if a
passenger door or the hood is
opened without first disarming the
system. When the alarm is
activated, the turn signals flash and
the horn sounds for about
30 seconds. The alarm system will
then re-arm to monitor for the next
unauthorized event.
Disarming the Alarm System
To disarm the alarm system or turn
off the alarm if it has been activated:
. Press
Kon the RKE transmitter.
. Start the vehicle.
To avoid setting off the alarm by
mistake:
. Lock the vehicle after all
occupants have exited. .
Always unlock a door with the
RKE transmitter.
Unlocking the driver door with
the key will not disarm the
system or turn off the alarm.
How to Detect a Tamper
Condition
IfKis pressed on the RKE
transmitter and the horn chirps three
times, an alarm occurred previously
while the alarm system was armed.
If the alarm has been activated, a
message will appear on the DIC.
Immobilizer
See Radio Frequency Statement
0 448.
Immobilizer Operation
This vehicle has a passive
theft-deterrent system.
The system does not have to be
manually armed or disarmed.
The vehicle is automatically
immobilized when the vehicle is
turned off.
The system is automatically
disarmed when the ignition is turned
from off to on.
The security light, in the instrument
cluster, comes on if there is a
problem with arming or disarming
the theft-deterrent system.
When trying to start the vehicle, the
security light comes on briefly when
the ignition is turned on.
If the engine does not start and the
security light stays on, there is a
problem with the system. Turn the
ignition off and try again.
If the vehicle will not change ignition
modes (ACC/ACCESSORY, on, off),
and the RKE transmitter appears to
be undamaged, try another
transmitter. Or, you may try placing

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - CRC - 5/13/19
68 Seats and Restraints
Seats and
Restraints
Head Restraints
Head Restraints . . . . . . . . . . . . . . . 69
Front Seats
Seat Adjustment . . . . . . . . . . . . . . . 70
Center Seat . . . . . . . . . . . . . . . . . . . . 71
Power Seat Adjustment . . . . . . . . 71
Lumbar Adjustment . . . . . . . . . . . . 72
Reclining Seatbacks . . . . . . . . . . . 72
Memory Seats . . . . . . . . . . . . . . . . . 74
Heated and Ventilated FrontSeats . . . . . . . . . . . . . . . . . . . . . . . . . 76
Rear Seats
Rear Seats . . . . . . . . . . . . . . . . . . . . 78
Heated Rear Seats . . . . . . . . . . . . 79
Seat Belts
Seat Belts . . . . . . . . . . . . . . . . . . . . . 80
How to Wear Seat BeltsProperly . . . . . . . . . . . . . . . . . . . . . . 81
Lap-Shoulder Belt . . . . . . . . . . . . . 83
Seat Belt Use During Pregnancy . . . . . . . . . . . . . . . . . . . . 85
Seat Belt Extender . . . . . . . . . . . . . 85
Safety System Check . . . . . . . . . . 85 Seat Belt Care . . . . . . . . . . . . . . . . . 86
Replacing Seat Belt System
Parts after a Crash . . . . . . . . . . . 86
Airbag System
Airbag System . . . . . . . . . . . . . . . . . 87
Where Are the Airbags? . . . . . . . 89
When Should an AirbagInflate? . . . . . . . . . . . . . . . . . . . . . . . 90
What Makes an Airbag Inflate? . . . . . . . . . . . . . . . . . . . . . . . 91
How Does an Airbag Restrain? . . . . . . . . . . . . . . . . . . . . . 91
What Will You See after an Airbag Inflates? . . . . . . . . . . . . . . 92
Passenger Sensing System . . . 93
Servicing the Airbag-Equipped Vehicle . . . . . . . . . . . . . . . . . . . . . . . 97
Adding Equipment to the Airbag-Equipped Vehicle . . . . . 98
Airbag System Check . . . . . . . . . . 99
Replacing Airbag System Parts after a Crash . . . . . . . . . . . . . . . . . 99
Child Restraints
Older Children . . . . . . . . . . . . . . . . 100
Infants and Young Children . . . 101
Child Restraint Systems . . . . . . 104
Where to Put the Restraint . . . 105
Lower Anchors and Tethers forChildren (LATCH System) . . . 107 Replacing LATCH System
Parts After a Crash . . . . . . . . . . 118
Securing Child Restraints (With the Seat Belt in the
Rear Seat) . . . . . . . . . . . . . . . . . . 118
Securing Child Restraints (In the Center Front Seat) . . . . . . 122
Securing Child Restraints (With the Seat Belt in the Front
Outboard Seat) . . . . . . . . . . . . . 122

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-1500-11698638) - 2019 - CRC - 5/13/19
84 Seats and Restraints
3. Push the latch plate into thebuckle until it clicks.
Pull up on the latch plate to
make sure it is secure. If the
belt is not long enough, see
Seat Belt Extender 085.
Position the release button on
the buckle so that the seat belt
could be quickly unbuckled if
necessary.
4. To make the lap part tight, pull up on the shoulder belt.
To unlatch the belt, push the button
on the buckle. The belt should
return to its stowed position.
Always stow the seat belt slowly.
If the seat belt webbing returns
quickly to the stowed position, the
retractor may lock and cannot be
pulled out. If this happens, pull the
seat belt straight out firmly to unlock
the webbing, and then release it.
If the webbing is still locked in the
retractor, see your dealer.
Before a door is closed, be sure the
seat belt is out of the way. If a door
is slammed against a seat belt,
damage can occur to both the seat
belt and the vehicle.
Seat Belt Pretensioners
This vehicle has seat belt
pretensioners for front outboard
occupants. Although the seat belt
pretensioners cannot be seen, they
are part of the seat belt assembly.
They can help tighten the seat 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. Seat belt
pretensioners can also help tighten
the seat belts in a side crash or
rollover event.
Pretensioners work only once. If the
pretensioners activate in a crash,
the pretensioners and probably
other parts of the vehicle's seat belt
system will need to be replaced.
See Replacing Seat Belt System
Parts after a Crash 086.
Do not sit on the outboard seat belt
while entering or exiting the vehicle
or at any time while sitting in the
seat. Sitting on the seat belt can
damage the webbing and hardware.