2020 GMC ACADIA ECU

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13687875) - 2020 - CRC - 10/28/19
Keys, Doors, and Windows 7
Keys, Doors, and
Windows
Keys and Locks
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Remote Keyless Entry (RKE)System . . . . . . . . . . . . . . . . . . . . . . . . 8
Remote Keyless Entry (RKE) System Operation . . . . . . . . . . . . . 8
Remote Vehicle Start . . . . . . . . . . 15
Door Locks . . . . . . . . . . . . . . . . . . . . 17
Power Door Locks . . . . . . . . . . . . . 19
Delayed Locking . . . . . . . . . . . . . . . 19
Automatic Door Locks . . . . . . . . . 19
Lockout Protection . . . . . . . . . . . . . 20
Safety Locks . . . . . . . . . . . . . . . . . . . 20
Doors
Liftgate . . . . . . . . . . . . . . . . . . . . . . . . 21
Vehicle Security
Vehicle Security . . . . . . . . . . . . . . . . 29
Vehicle Alarm System . . . . . . . . . 29
Immobilizer . . . . . . . . . . . . . . . . . . . . 30
Immobilizer Operation . . . . . . . . . 30
Exterior Mirrors
Convex Mirrors . . . . . . . . . . . . . . . . 31
Power Mirrors . . . . . . . . . . . . . . . . . . 31 Folding Mirrors . . . . . . . . . . . . . . . . . 32
Heated Mirrors . . . . . . . . . . . . . . . . . 33
Automatic Dimming Mirror . . . . . 33
Reverse Tilt Mirrors . . . . . . . . . . . . 33
Interior Mirrors
Interior Rearview Mirrors . . . . . . . 33
Manual Rearview Mirror . . . . . . . . 33
Automatic Dimming Rearview
Mirror . . . . . . . . . . . . . . . . . . . . . . . . . 33
Rear Camera Mirror . . . . . . . . . . . . 34
Windows
Windows . . . . . . . . . . . . . . . . . . . . . . . 36
Power Windows . . . . . . . . . . . . . . . 36
Sun Visors . . . . . . . . . . . . . . . . . . . . . 38
Roof
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . 38
Keys and Locks
Keys
{Warning
Leaving children in a vehicle with
a Remote Keyless Entry (RKE)
transmitter 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 RKE transmitter
in the vehicle, and children or
others could be caught in the path
of a closing window. Do not leave
children in a vehicle with an RKE
transmitter.

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13687875) - 2020 - CRC - 10/28/19
Keys, Doors, and Windows 19
5. Check that the cap is secure.
Free-Turning Locks
The door key lock cylinder turns
freely when either the wrong key is
used, or the correct key is not fully
inserted. The free-turning door lock
feature prevents the lock from being
forced open. To reset the lock, turn
it to the vertical position with the
correct key fully inserted. Remove
the key and insert it again. If this
does not reset the lock, turn the key
halfway around in the cylinder and
repeat the reset procedure.Power Door Locks
Q: Press to lock the doors. The
indicator light in the switch will come
on when the door is locked.
K: Press to unlock the doors.
Delayed Locking
This feature delays the locking of
the doors until five seconds after all
doors are closed.
Delayed locking can only be turned
on when the Open Door Anti Lock
Out has been turned off. When
Qis pressed on the power
door lock switch while the door is
open, a chime will sound three
times indicating delayed locking is
active.
The doors will lock automatically
five seconds after all doors are
closed. If a door is reopened before
that time, the five-second timer will
reset when all doors are closed
again.
Press
Qon the door lock switch
again or press
Qon the RKE
transmitter to lock the doors
immediately.
This feature can also be
programmed. See Vehicle
Personalization 0146.
Automatic Door Locks
The vehicle is programmed so that
when the doors are closed, the
ignition is on, and the vehicle is not
in P (Park), the doors will lock.
If a vehicle door is unlocked and
then opened and closed, the doors
will lock either when your foot is

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13687875) - 2020 - CRC - 10/28/19
22 Keys, Doors, and Windows
Manual Liftgate
To unlock the liftgate, pressKon
the power door lock switch or press
Kon the RKE transmitter twice
within five seconds. See Remote
Keyless Entry (RKE) System
Operation 08.
To open the liftgate, press the touch
pad on the bottom of the liftgate
handle and lift up.
Use the pull cup to lower and close
the liftgate. Do not press the touch
pad while closing the liftgate. This
will cause the liftgate to be
unlatched. If equipped with Keyless Access,
the liftgate can be opened when
locked if the RKE transmitter is
within 1 m (3 ft) of the touch pad.
See
Remote Keyless Entry (RKE)
System Operation 08.
The liftgate has an electric latch.
If the battery is disconnected or has
low voltage, the liftgate will not
open. The liftgate will resume
operation when the battery is
reconnected and charged.
Always close the liftgate before
driving.
Power Liftgate Operation
{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.
Caution
Driving with an open and
unsecured liftgate may result in
damage to the power liftgate
components.
If equipped, the power liftgate
switch is on the driver door. The
vehicle must be in P (Park). The
taillamps flash when the power
liftgate moves.
The modes are:
. MAX: Opens to maximum
height.

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13687875) - 2020 - CRC - 10/28/19
Keys, Doors, and Windows 23
.3/4: Opens to a reduced height
that can be set from 3/4 to fully
open. Use to prevent the liftgate
from opening into overhead
obstructions such as a garage
door or roof-mounted cargo. The
liftgate can be manually opened
all the way.
. OFF: Opens manually only.
To power open or close the liftgate,
select MAX or 3/4 mode.
. Press
btwice quickly on the
RKE transmitter until the liftgate
moves.
. Press
8on the driver door.
The driver door must either be
unlocked or locked without the
security armed.
. Press the touch pad on the
bottom of the liftgate after
unlocking all doors. If equipped
with Keyless Access, a locked
vehicle can be opened if the
RKE transmitter is within 1 m
(3 ft) of the touch pad.
Presslon the bottom of the
liftgate next to the pull cup to close.
Press any liftgate button, the touch
pad, or
bon the RKE transmitter
while the liftgate is moving to stop it.
Pressing any liftgate button
or pressing
btwice quickly on the
RKE transmitter again restarts the
operation in the reverse direction.
Pressing the touch pad on the
liftgate handle will restart the
motion, but only in the opening
direction.
Caution
Manually forcing the liftgate to
open or close during a power
cycle can damage the vehicle.
Allow the power cycle to
complete.
The power liftgate may be
temporarily disabled under extreme
low temperatures, or after repeated
power cycling over a short period of
time. If this occurs, the liftgate can
still be operated manually.
If the vehicle is shifted out of
P (Park) while the power function is
in progress, the liftgate will continue
to completion. If the vehicle is
accelerated before the liftgate has
completed moving, the liftgate may
stop or reverse direction. Check for
Driver Information Center (DIC)
messages and make sure the
liftgate is closed and latched before
driving.

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13687875) - 2020 - CRC - 10/28/19
Keys, Doors, and Windows 29
Vehicle Security
This vehicle has theft-deterrent
features; however, they do not make
the vehicle impossible to steal.
Vehicle Alarm System
This vehicle has an anti-theft 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, the hood, or the liftgate
is open.
Slow Flash : Alarm system is
armed.
Arming the Alarm System
1. Close the liftgate and the hood. Turn off the vehicle.
2. Lock the vehicle in one of three ways:
.Use the RKE transmitter.
. Use the Keyless Access
system.
. With a door open, press the
inside
Q.
3. After 30 seconds the alarm system will arm, and the
indicator light will begin to
slowly flash indicating the
alarm system is operating.
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
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, the liftgate, 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.

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13687875) - 2020 - CRC - 10/28/19
30 Keys, Doors, and Windows
Disarming the Alarm System
To disarm the alarm system or turn
off the alarm if it has been activated:
.Press
Kon the RKE transmitter.
. Unlock the vehicle using the
Keyless Access system.
. Start the vehicle.
To avoid setting off the alarm by
accident:
. Lock the vehicle after all
occupants have left the vehicle
and all doors are closed.
. Always unlock a door with the
RKE transmitter or use the
Keyless Access system.
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 and the horn chirps
and the lights flash three times, the
alarm was activated while the alarm
system was armed. If the alarm system has been
activated, a message will appear on
the Driver Information Center (DIC).
Immobilizer
See
Radio Frequency Statement
0 380.
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 immobilization system is
disarmed when the ignition is on or
in ACC/ACCESSORY and a valid
transmitter is present in the vehicle.
The security light, in the instrument
cluster, comes on if there is a
problem with arming or disarming
the theft-deterrent system.
The system has one or more RKE
transmitters matched to an
immobilizer control unit in your
vehicle. Only a correctly matched
RKE transmitter will start the
vehicle. If the transmitter is ever
damaged, you may not be able to
start your vehicle.
When trying to start the vehicle, the
security light may come 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
the transmitter in the transmitter
pocket located in the center
console. See Remote Keyless Entry
(RKE) System Operation 08.

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13687875) - 2020 - CRC - 10/28/19
Seats and Restraints 41
Seats and
Restraints
Head Restraints
Head Restraints . . . . . . . . . . . . . . . 42
Front Seats
Seat Adjustment . . . . . . . . . . . . . . . 43
Power Seat Adjustment . . . . . . . . 44
Lumbar Adjustment . . . . . . . . . . . . 45
Reclining Seatbacks . . . . . . . . . . . 45
Memory Seats . . . . . . . . . . . . . . . . . 46
Heated and Ventilated FrontSeats . . . . . . . . . . . . . . . . . . . . . . . . . 49
Rear Seats
Rear Seats . . . . . . . . . . . . . . . . . . . . 51
Heated Rear Seats . . . . . . . . . . . . 54
Third Row Seats . . . . . . . . . . . . . . . 55
Seat Belts
Seat Belts . . . . . . . . . . . . . . . . . . . . . 56
How to Wear Seat BeltsProperly . . . . . . . . . . . . . . . . . . . . . . 57
Lap-Shoulder Belt . . . . . . . . . . . . . 59
Seat Belt Use During Pregnancy . . . . . . . . . . . . . . . . . . . . 62
Seat Belt Extender . . . . . . . . . . . . . 63
Safety System Check . . . . . . . . . . 63 Seat Belt Care . . . . . . . . . . . . . . . . . 63
Replacing Seat Belt System
Parts after a Crash . . . . . . . . . . . 64
Airbag System
Airbag System . . . . . . . . . . . . . . . . . 64
Where Are the Airbags? . . . . . . . 66
When Should an AirbagInflate? . . . . . . . . . . . . . . . . . . . . . . . 68
What Makes an Airbag Inflate? . . . . . . . . . . . . . . . . . . . . . . . 69
How Does an Airbag Restrain? . . . . . . . . . . . . . . . . . . . . . 69
What Will You See after an Airbag Inflates? . . . . . . . . . . . . . . 70
Passenger Sensing System . . . 71
Servicing the Airbag-Equipped Vehicle . . . . . . . . . . . . . . . . . . . . . . . 75
Adding Equipment to the Airbag-Equipped Vehicle . . . . . 76
Airbag System Check . . . . . . . . . . 77
Replacing Airbag System Parts after a Crash . . . . . . . . . . . . . . . . . 77
Child Restraints
Older Children . . . . . . . . . . . . . . . . . 77
Infants and Young Children . . . . 79
Child Restraint Systems . . . . . . . 81
Where to Put the Restraint . . . . . 83
Lower Anchors and Tethers forChildren (LATCH System) . . . . 85 Replacing LATCH System Parts
After a Crash . . . . . . . . . . . . . . . . . 92
Securing Child Restraints (With the Seat Belt in the
Rear Seat) . . . . . . . . . . . . . . . . . . . 93
Securing Child Restraints (With the Seat Belt in the
Front Seat) . . . . . . . . . . . . . . . . . . . 95

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13687875) - 2020 - CRC - 10/28/19
60 Seats and Restraints
2. Pick up the latch plate and pullthe belt across you. Do not let
it get twisted.
The lap-shoulder belt may lock
if you pull the belt across you
very quickly. If this happens, let
the belt go back slightly to
unlock it. Then pull the belt
across you more slowly.
If the shoulder portion of a
passenger belt is pulled out all
the way, the child restraint
locking feature may be
engaged. See Child Restraint
Systems 081. If this occurs, let
the belt go back all the way
and start again. If the locking feature stays engaged after
letting the belt go back to
stowed position on the seat,
move the seat rearward or
recline the seat until the
shoulder belt retractor lock
releases.
Engaging the child restraint
locking feature in the front
outboard seating position may
affect the passenger sensing
system. See
Passenger
Sensing System 071.
If the webbing locks in the latch
plate before it reaches the
buckle, tilt the latch plate flat to
unlock.
3. Push the latch plate into the
buckle 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 063.
Position the release button on
the buckle so that the seat belt
could be quickly unbuckled if
necessary.