2021 GMC TERRAIN ECU

GMC Terrain/Terrain Denali Owner Manual(GMNA-Localizing-U.S./Canada/
Mexico-14420055) - 2021 - CRC - 11/13/20
68 Seats and Restraints
.If the position you are using does not
have a headrest or head restraint and
you are using a single tether, route
the tether over the seatback.
.If the position you are using does not
have a headrest or head restraint and
you are using a dual tether, route the
tether over the seatback.
.If the position you are using has an
adjustable headrest or head restraint
and you are using a dual tether, raise
the headrest or head restraint and
route the tether under the headrest
or head restraint and in between the
headrest or head restraint posts.
.If the position you are using has an
adjustable headrest or head restraint
and you are using a single tether,
raise the headrest or head restraint
and route the tether under the
headrest or head restraint and in
between the headrest or head
restraint posts.
3. Before placing a child in the child restraint, make sure it is securely held in
place. To check, grasp the child restraint
at the LATCH path and attempt to move
it side to side and back and forth. There
should be no more than 2.5 cm (1 in) of
movement, for proper installation.
Replacing LATCH System Parts
After a Crash
{Warning
A crash can damage the LATCH system in
the vehicle. A damaged LATCH system
may not properly secure the child
restraint, resulting in serious injury or
even death in a crash. To help make sure
the LATCH system is working properly
(Continued)

GMC Terrain/Terrain Denali Owner Manual(GMNA-Localizing-U.S./Canada/
Mexico-14420055) - 2021 - CRC - 11/13/20
Seats and Restraints 69
Warning (Continued)
after a crash, see your dealer to have the
system inspected and any necessary
replacements made as soon as possible.
If the vehicle has the LATCH system and it
was being used during a crash, new LATCH
system parts may be needed.
New parts and repairs may be necessary
even if the LATCH system was not being
used at the time of the crash.
Securing Child Restraints (With
the Seat Belt in the Rear Seat)
When securing a child restraint with the
seat belts in a rear seat position, study the
instructions that came with the child
restraint to make sure it is compatible with
this vehicle.
If the child restraint has the LATCH system,
see Lower Anchors and Tethers for Children
(LATCH System) 063 for how and where to
install the child restraint using LATCH. If a
child restraint is secured in the vehicle using
a seat belt and it uses a top tether, see
Lower Anchors and Tethers for Children
(LATCH System) 063 for top tether anchor
locations. Do not secure a child seat in a position
without a top tether anchor if a national or
local law requires that the top tether be
anchored, or if the instructions that come
with the child restraint say that the top
tether must be anchored.
In Canada, the law requires that
forward-facing child restraints have a top
tether, and that the tether be attached.
If the child restraint or vehicle seat position
does not have the LATCH system, you will
be using the seat belt to secure the child
restraint. Be sure to follow the instructions
that came with the child restraint.
If more than one child restraint needs to be
installed in the rear seat, be sure to read
Where to Put the Restraint
062.
1. Put the child restraint on the seat.
2. Pick up the latch plate, and run the lap and shoulder portions of the vehicle seat
belt through or around the restraint. The
child restraint instructions will show
you how.
3. Push the latch plate into the buckle untilit clicks.
Position the release button on the
buckle, away from the child restraint, so
that the seat belt could be quickly
unbuckled if necessary.

GMC Terrain/Terrain Denali Owner Manual(GMNA-Localizing-U.S./Canada/
Mexico-14420055) - 2021 - CRC - 11/13/20
70 Seats and Restraints
4. Pull the shoulder belt all the way out ofthe retractor to set the lock. When the
retractor lock is set, the belt can be
tightened but not pulled out of the
retractor.5. To tighten the belt, push down on thechild restraint, pull the shoulder portion
of the belt to tighten the lap portion of
the belt, and feed the shoulder belt back
into the retractor. When installing a
forward-facing child restraint, it may be
helpful to use your knee to push down
on the child restraint as you tighten
the belt.
Try to pull the belt out of the retractor
to make sure the retractor is locked.
If the retractor is not locked, repeat
Steps 4 and 5. 6. If the child restraint has a top tether,
follow the child restraint manufacturer's
instructions regarding the use of the top
tether. See Lower Anchors and Tethers
for Children (LATCH System) 063.
7. Before placing a child in the child restraint, make sure it is securely held in
place. To check, grasp the child restraint
at the seat belt path and attempt to
move it side to side and back and forth.
When the child restraint is properly
installed, there should be no more than
2.5 cm (1 in) of movement.
To remove the child restraint, unbuckle the
vehicle seat belt and let it return to the
stowed position. If the top tether is attached
to a top tether anchor, disconnect it.
Securing Child Restraints (With
the Seat Belt in the Front Seat)
This vehicle has airbags. A rear seat is a
safer place to secure a forward-facing child
restraint. See Where to Put the Restraint
0 62.

GMC Terrain/Terrain Denali Owner Manual(GMNA-Localizing-U.S./Canada/
Mexico-14420055) - 2021 - CRC - 11/13/20
Seats and Restraints 71
In addition, the vehicle has a passenger
sensing system which is designed to turn off
the front outboard passenger frontal airbag
under certain conditions. SeePassenger
Sensing System 052 and
Passenger Airbag Status Indicator 092 for
more information, including important
safety information.
Never put a rear-facing child seat in the
front. This is because the risk to the
rear-facing child is so great, if the airbag
deploys.
{Warning
A child in a rear-facing child restraint can
be seriously injured or killed if the front
outboard passenger frontal airbag
inflates. This is because the back of the
rear-facing child restraint would be very
close to the inflating airbag. A child in a
forward-facing child restraint can be
seriously injured or killed if the front
outboard passenger frontal airbag inflates
and the passenger seat is in a forward
position.
(Continued)
Warning (Continued)
Even if the passenger sensing system has
turned off the front outboard passenger
frontal airbag, no system is fail-safe. No
one can guarantee that an airbag will not
deploy under some unusual circumstance,
even though it is turned off.
Secure rear-facing child restraints in a
rear seat, even if the airbag is off. If you
secure a forward-facing child restraint in
the front outboard passenger seat,
always move the seat as far back as it
will go. It is better to secure the child
restraint in a rear seat.
SeePassenger Sensing System 052 for
additional information.
If the child restraint uses a top tether, see
Lower Anchors and Tethers for Children
(LATCH System) 063 for top tether anchor
locations.
Do not secure a child seat in a position
without a top tether anchor if a national or
local law requires that the top tether be
anchored, or if the instructions that come
with the child restraint say that the top
tether must be anchored. In Canada, the law requires that
forward-facing child restraints have a top
tether, and that the tether be attached.
When using the lap-shoulder belt to secure
the child restraint in this position, follow the
instructions that came with the child
restraint and the following instructions:
1. Move the seat as far back as it will go before securing the forward-facing child
restraint. Move the seat upward or the
seatback to an upright position,
if needed, to get a tight installation of
the child restraint.
When the passenger sensing system has
turned off the front outboard passenger
frontal airbag, the OFF indicator on the
passenger airbag status indicator should
light and stay lit when you start the
vehicle. See Passenger Airbag Status
Indicator 092.
2. Put the child restraint on the seat.
3. Pick up the latch plate, and run the lap and shoulder portions of the vehicle seat
belt through or around the restraint. The
child restraint instructions will show
you how.

GMC Terrain/Terrain Denali Owner Manual(GMNA-Localizing-U.S./Canada/
Mexico-14420055) - 2021 - CRC - 11/13/20
72 Seats and Restraints
Tilt the latch plate to adjust the belt if
needed.
4. Push the latch plate into the buckle untilit clicks. Position the release button on the
buckle, away from the child restraint, so
that the seat belt could be quickly
unbuckled if necessary.
5. Pull the shoulder belt all the way out of
the retractor to set the lock. When the
retractor lock is set, the belt can be
tightened but not pulled out of the
retractor.
6. To tighten the belt, push down on thechild restraint, pull the shoulder portion
of the belt to tighten the lap portion of
the belt, and feed the shoulder belt back
into the retractor. When installing a
forward-facing child restraint, it may be
helpful to use your knee to push down
on the child restraint as you tighten
the belt.
Try to pull the belt out of the retractor
to make sure the retractor is locked.
If the retractor is not locked, repeat
Steps 5 and 6.
7. Before placing a child in the child restraint, make sure it is securely held in
place. To check, grasp the child restraint
at the seat belt path and attempt to

GMC Terrain/Terrain Denali Owner Manual(GMNA-Localizing-U.S./Canada/
Mexico-14420055) - 2021 - CRC - 11/13/20
Storage 75
Center Console Storage
There is storage in the center console; lift
the lever on the front to open.
If equipped, there are two USB ports for
data and charging.
Additional Storage Features
Cargo Cover
{Warning
An unsecured cargo cover could strike
people in a sudden stop or turn, or in a
crash. Store the cargo cover securely or
remove it from the vehicle.
{Warning
Do not place objects on the cargo cover.
Sudden stops or turns can cause objects
to be thrown in the vehicle. You or
others could be injured.
If equipped, use the cargo cover to cover
items in the rear of the vehicle.
To remove the cover from the vehicle, pull
both ends toward each other.
To store the cargo cover:
1. Press the buttons on both ends until locked.
2. Insert the right side of the cargo coverfirst.
3. Store under the load floor.

GMC Terrain/Terrain Denali Owner Manual(GMNA-Localizing-U.S./Canada/
Mexico-14420055) - 2021 - CRC - 11/13/20
76 Storage
To reinstall, press the buttons to unlock the
ends of the cover.
Place each end of the cover in the holes
behind the rear seat.
Cargo Tie-Downs
1. Convenience Net Retainers
2. Cargo Tie-Downs
The vehicle may be equipped with two
cargo tie-downs and two convenience net
retainers in the rear compartment.
Convenience Net
This vehicle may have a convenience net in
the rear of the vehicle. Attach it to the
convenience net retainers for storing small
loads.
Do not use the net to store heavy loads.
Roof Rack System
The vehicle is equipped with side-rails for a
roof rack system. Cargo must be secured
with properly installed cross rails and other
accessories designed to carry cargo. These
can be purchased from your dealer.
{Warning
Before driving and occasionally during a
trip, check that cargo is securely fastened,
rests evenly between the cross rails and
does not block the vehicle's lamps or
windows. Never load cargo directly on
the roof of the vehicle or allow cargo to
hang over the rear or sides of the vehicle.
Never load cargo without first properly
installing cross rails and other accessories(Continued)
Warning (Continued)
designed to carry cargo. Personal injury,
death or damage to the vehicle or other
property may occur.
If driving for a long distance, on rough
roads, or at high speeds, occasionally stop
the vehicle to make sure the cargo remains
in its place.
Cargo Weight Limits
Do not exceed the maximum cargo weight
for the roof rack system, including the
weight of the cross rails and any other
accessories used to carry the cargo such as
bike racks or roof boxes.
For all trim levels except Denali, the
maximum cargo weight that can be loaded
onto the roof rack system is 100 kg (220 lb).

GMC Terrain/Terrain Denali Owner Manual(GMNA-Localizing-U.S./Canada/
Mexico-14420055) - 2021 - CRC - 11/13/20
78 Instruments and Controls
Instruments and Controls
Controls
Steering Wheel Adjustment . . . . . . . . . . . . 79
Steering Wheel Controls . . . . . . . . . . . . . . . . 79
Heated Steering Wheel . . . . . . . . . . . . . . . . . 79
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Windshield Wiper/Washer . . . . . . . . . . . . . . 79
Rear Window Wiper/Washer . . . . . . . . . . . 80
Compass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Power Outlets . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Wireless Charging . . . . . . . . . . . . . . . . . . . . . . 82
Warning Lights, Gauges, and Indicators
Warning Lights, Gauges, andIndicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Instrument Cluster (Base and Midlevel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Instrument Cluster (Uplevel) . . . . . . . . . . . . 88
Speedometer . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Trip Odometer . . . . . . . . . . . . . . . . . . . . . . . . . 90
Tachometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Fuel Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Engine Coolant Temperature Gauge . . . . 91
Seat Belt Reminders . . . . . . . . . . . . . . . . . . . . 91
Airbag Readiness Light . . . . . . . . . . . . . . . . . 92
Passenger Airbag Status Indicator . . . . . . 92
Charging System Light . . . . . . . . . . . . . . . . . 93 Malfunction Indicator Lamp (Check
Engine Light) . . . . . . . . . . . . . . . . . . . . . . . . . 93
Brake System Warning Light . . . . . . . . . . . 95
Electric Parking Brake Light . . . . . . . . . . . . . 95
Service Electric Parking Brake Light . . . . . 95
Antilock Brake System (ABS) Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Tow/Haul Mode Light . . . . . . . . . . . . . . . . . . 96
Hill Descent Control Light . . . . . . . . . . . . . . 96
Lane Keep Assist (LKA) Light . . . . . . . . . . . 96
Vehicle Ahead Indicator . . . . . . . . . . . . . . . . 97
Pedestrian Ahead Indicator . . . . . . . . . . . . . 97
Traction Off Light . . . . . . . . . . . . . . . . . . . . . . 97
StabiliTrak OFF Light . . . . . . . . . . . . . . . . . . . . 97
Traction Control System (TCS)/StabiliTrak Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Tire Pressure Light . . . . . . . . . . . . . . . . . . . . . 98
Engine Oil Pressure Light . . . . . . . . . . . . . . . 98
Low Fuel Warning Light . . . . . . . . . . . . . . . . 99
Security Light . . . . . . . . . . . . . . . . . . . . . . . . . . 99
High-Beam On Light . . . . . . . . . . . . . . . . . . . . 99
Front Fog Lamp Light . . . . . . . . . . . . . . . . . 100
Lamps On Reminder . . . . . . . . . . . . . . . . . . . 100
Cruise Control Light . . . . . . . . . . . . . . . . . . . 100
Door Ajar Light . . . . . . . . . . . . . . . . . . . . . . . . 100
Information Displays
Driver Information Center (DIC) (Base and Midlevel) . . . . . . . . . . . . . . . . . . . . . . . . 100
Driver Information Center (DIC) (Uplevel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Vehicle Messages
Vehicle Messages . . . . . . . . . . . . . . . . . . . . . . 108
Engine Power Messages . . . . . . . . . . . . . . . 108
Vehicle Speed Messages . . . . . . . . . . . . . . . 108
Vehicle Personalization
Vehicle Personalization . . . . . . . . . . . . . . . . 108
Universal Remote System
Universal Remote System . . . . . . . . . . . . . . 112
Universal Remote SystemProgramming . . . . . . . . . . . . . . . . . . . . . . . . . 113
Universal Remote System Operation . . . 115