Window CHEVROLET SUBURBAN 2021 Service Manual

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13690484) - 2021 - crc - 8/17/20
Instruments and Controls 127
Touch Off, On - Driver and Passenger, On -
Driver, or On - Passenger.
Remote Mirror Folding
When on, the outside mirrors will remotely
fold or unfold when the Remote Key
Qor
Kbutton is pressed and held. SeeFolding
Mirrors 028.
Touch Off or On.
Rain Sense Wipers
This setting automatically turns on the
wipers when moisture is detected and the
wiper switch is in intermittent mode.
Touch Disabled or Enabled.
Auto Wipe in Reverse Gear
When on and the front wiper is on, the rear
wiper will automatically activate when the
vehicle is shifted into R (Reverse).
Touch Off or On.
Lighting
Touch and the following may display:
.Vehicle Locator Lights
.Exit Lighting
.Automatic High Beam Assist Vehicle Locator Lights
This setting flashes the vehicle’s headlamps
when
Kis pressed on the Remote Key.
Touch Off or On.
Exit Lighting
This setting specifies how long the
headlamps stay on after the vehicle is
turned off and exited.
Touch Off, 30 Seconds, 60 Seconds,
or 120 Seconds.
Automatic High Beam Assist
This setting specifies how the high beams
adjust based on the vehicle environment.
See Exterior Lamp Controls 0133.
Touch IntelliBeam or Adaptive Headlight
System.
Power Door Locks
Touch and the following may display:
.Auto Door Unlock
.Delayed Door Lock
Auto Door Unlock
This setting allows selection of which doors
will automatically unlock when the vehicle is
shifted into P (Park). Touch Off, All Doors, or Driver Door.
Delayed Door Lock
When on, this feature will delay the locking
of the doors. To override the delay, press
the power door lock switch on the door.
Touch Off or On.
Remote Lock, Unlock, and Start
Touch and the following may display:
.Remote Unlock Light Feedback
.Remote Lock Feedback
.Remote Door Unlock
.Remote Start Auto Cool Seats
.Remote Start Auto Heat Seats
.Remote Window Operation
.Passive Door Unlock
.Passive Door Lock
.Remote Left in Vehicle Alert
.Remote Removed from Vehicle Alert
Remote Unlock Light Feedback
When on, the exterior lamps will flash when
unlocking the vehicle with the Remote Key.
Touch Off or Flash Lights.

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13690484) - 2021 - crc - 8/17/20
128 Instruments and Controls
Remote Lock Feedback
This allows selection of what type of
feedback is given when locking the vehicle
with the Remote Key.
Touch Off, Lights and Horn, Lights Only,
or Horn Only.
Remote Door Unlock
This allows selection of which doors will
unlock when pressing
Kon the
Remote Key.
Touch All Doors or Driver Door.
Remote Start Auto Cool Seats
If equipped and turned on, this feature will
turn on the ventilated seats when using
remote start on warm days. See Heated and
Ventilated Front Seats 043 and
Remote Vehicle Start 014.
Touch Off or On.
Remote Start Auto Heat Seats
If equipped and turned on, this feature will
turn on the heated seats when using remote
start on cold days. See Heated and
Ventilated Front Seats 043 and
Remote Vehicle Start 014. If equipped with Auto Heated Steering
Wheel, this feature will turn on when the
Remote Start Auto Heated Seats turn on.
Touch Off or On.
Remote Window Operation
If equipped, this feature enables remote
operation of the windows with the Remote
Key. See
Remote Keyless Entry (RKE) System
Operation 08.
Touch Off or On.
Passive Door Unlock
This allows the selection of what doors will
unlock when using the button on the driver
door to unlock the vehicle.
Touch Off, All Doors or Driver Door Only.
Passive Door Lock
This allows passive locking to be turned on
or off and selects feedback. See Remote
Keyless Entry (RKE) System Operation 08.
Touch Off, On with Horn Chirp, or On.
Remote Left in Vehicle Alert
This feature sounds an alert when the
Remote Key is left in the vehicle.
Touch Off or On. Remote Removed from Vehicle Alert
This feature beeps the horn 3 times when
exiting a running vehicle with the
Remote Key.
Touch Off or On.
Ride Height
Touch and the following may display:
.Automatic Entry/Egress
Automatic Entry/Egress
This feature specifies if the vehicle will
automatically lower to make it easier to
enter or exit the vehicle.
Touch Off or On.
Running Boards
Touch and the following may display:
.Automatic Running Boards
.Deploy Running Boards
Automatic Running Boards
This feature specifies the position and use of
the running boards. See Power Assist Steps
0 25.
Touch Off or On.

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13690484) - 2021 - crc - 8/17/20
Lighting 139
Lighting Features
Entry Lighting
Some exterior lamps turn on briefly at
night, or in areas with limited lighting,
when
Kis pressed on the remote key. After
about 30 seconds the exterior lamps turn off
when any door is opened, the unlock button
on the remote key is pressed, or when the
ignition is switched off. All interior lights
turn on and then the dome and remaining
interior lamps dim to off after 20 seconds.
Entry lighting feature for exterior lighting
can be changed by Vehicle Locator Lights.
See Vehicle Locator Lights under Vehicle
Personalization 0124.
Exit Lighting
Some exterior lamps come on at night, or in
areas with limited lighting, when the driver
door is opened after the ignition is turned
off. The dome lamp comes on after the
ignition is turned off. The exterior lamps and
dome lamp remain on after the door is
closed for a set amount of time, then
automatically turn off.
The exterior lamps turn off immediately by
turning the exterior lamp control off.
The exit lighting for exterior lights can be
changed. See Vehicle Personalization 0124.
Battery Load Management
The vehicle has Electric Power Management
(EPM), which estimates the battery's
temperature and state of charge. It then
adjusts the voltage for best performance
and extended life of the battery.
When the battery's state of charge is low,
the voltage is raised slightly to quickly bring
the charge back up. When the state of
charge is high, the voltage is lowered
slightly to prevent overcharging. The
voltmeter gauge or the voltage display on
the Driver Information Center (DIC), if equipped, may show the voltage moving
up or down. This is normal. If there is a
problem, an alert will be displayed.
The battery can be discharged at idle if the
electrical loads are very high. This is true for
all vehicles. This is because the generator
(alternator) may not be spinning fast
enough at idle to produce all the power that
is needed for very high electrical loads.
A high electrical load occurs when several of
the following are on, such as: headlamps,
high beams, rear window defogger, climate
control fan at high speed, heated seats,
engine cooling fans, trailer loads, and loads
plugged into accessory power outlets.
EPM works to prevent excessive discharge of
the battery. It does this by balancing the
generator's output and the vehicle's
electrical needs. It can increase engine idle
speed to generate more power, whenever
needed. It can temporarily reduce the power
demands of some accessories.
Normally, these actions occur in steps or
levels, without being noticeable. In rare
cases at the highest levels of corrective
action, this action may be noticeable to the
driver. If so, a DIC message might be

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13690484) - 2021 - crc - 8/17/20
Infotainment System 147
done up, down, right, or left. This feature is
only available when vehicle is parked and
not in motion.
Nudge
Nudge is used to move items a short
distance on a list or a map. To nudge, hold
and move the selected item up or down to
a new location.
Fling or Swipe
Fling or swipe is used to scroll through a
list, pan the map, or change page views. Do
this by placing a finger on the display then
moving it rapidly up and down or right
and left.
Spread
Spread is used to zoom in on a map, certain
images, or a web page. Place finger and
thumb together on the display, then move
them apart.Pinch
Pinch is used to zoom out on a map, certain
images, or a web page. Place finger and
thumb apart on the display, then move
them together.
Cleaning High Gloss Surfaces and Vehicle
Information and Radio Displays
For vehicles with high gloss surfaces or
vehicle displays, use a microfiber cloth to
wipe surfaces. Before wiping the surface
with the microfiber cloth, use a soft bristle
brush to remove dirt that could scratch the
surface. Then use the microfiber cloth by
gently rubbing to clean. Never use window
cleaners or solvents. Periodically hand wash
the microfiber cloth separately, using mild
soap. Do not use bleach or fabric softener.
Rinse thoroughly and air dry before
next use.

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13690484) - 2021 - crc - 8/17/20
192 Infotainment System
.Auto Heated Seats: This setting
automatically turns on and regulates the
heated seats when the cabin temperature
is cool. The auto heated seats can be
turned off by using the heated seat
controls on the center stack.
Touch the controls on the infotainment
display to disable or enable.
.Auto Defog: This setting automatically
turns the front defogger on when the
vehicle engine is started.
Touch the controls on the infotainment
display to disable or enable.
.Auto Rear Defog: This setting
automatically turns the rear window
defogger on when the vehicle engine is
started.
Touch the controls on the infotainment
display to disable or enable.
Navigation (if equipped)
Touch and the following may display:
.Set Up My Places
.Map Preferences
.Route Preferences
.Navigation Voice Control
.Traffic Preferences
.Alert Preferences
.Manage History
.Predictive Navigation
.About
See Using the Navigation System 0164.
Phone
Touch and the following may display:
.My Number: Displays the cell phone
number of the Bluetooth connected
device.
.Active Call View: Shows active call display
when answering a call.
Touch the controls on the infotainment
display to disable or enable.
.Privacy: Only show call alerts in the
instrument cluster.
Touch Off or On.
.Sort Contacts: Touch to sort by first or
last name.
.Re-sync Device Contacts:
This allows the device contacts to re-sync
if you are having difficulty accessing all of
the contacts on your cell phone.
.Delete All Vehicle Contacts: Touch to
delete all vehicle stored contacts.
.OnStar Phone TTY Mode: This enables
OnStar cell phone TTY mode. Touch Disable or Enable.
Vehicle
This menu allows adjustment of different
vehicle features. See
Vehicle Personalization
0 124.
Personal
If equipped, this menu allows adjustment of
different user profile settings. See “Users”in
Using the System 0145 for information on
setting up user profiles.
The menu may contain the following:
Name
Touch to edit your user name that will be
displayed in the vehicle.
Vehicle Account Information
Touch to view the vehicle account
information and to change the account
password.
An “unverified user account” pop-up will
display until the account information
verification process has been completed on
the Internet. Check your registered e-mail
account for an activation e-mail to complete
the verification process.

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13690484) - 2021 - crc - 8/17/20
204 Climate Controls
Climate Controls
Climate Control Systems
Dual Automatic Climate ControlSystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Rear Climate Control System . . . . . . . . . . 207
Air Vents
Air Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Maintenance
Passenger Compartment Air Filter . . . . . 209
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Climate Control Systems
Dual Automatic Climate Control System
The heating, cooling, and ventilation in the vehicle can be controlled with this system.
1. Driver and Passenger Temperature Controls
2. MAX Defrost
3. Air Delivery Mode Controls
4. A/C (Air Conditioning)
5. Heated Seat & Heated Backrest
6. SYNC (Synchronized Temperature)
7. Heated Seat
8. Vented Seat 9. Recirculation
10. Rear Climate Control
11. Power Button
12. Fan Control
13. Rear Climate Power Button
14. Rear Window Defogger
15. AUTO (Automatic Operation)

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13690484) - 2021 - crc - 8/17/20
206 Climate Controls
Manual Operation
Fan Control :Turn clockwise or
counterclockwise to increase or decrease the
fan speed. Press the knob to turn the fan
off. When off is selected, a small amount of
air may still come out of the outlets
depending on vehicle speed. If any buttons
are pressed or knobs are turned, the climate
control system will turn on and operate at
the current setting.
Press AUTO to return to automatic
operation.
Driver and Passenger Temperature Control :
The temperature can be adjusted separately
for the driver and passenger.
Turn the knob clockwise or counterclockwise
to increase or decrease the driver or
passenger temperature setting. The driver
side or passenger side temperature display
shows the temperature setting increasing or
decreasing.
SYNC : Press to link the passenger and rear
temperature setting to the driver setting.
The SYNC indicator light will turn on. When
the passenger setting is adjusted, the SYNC
indicator light will turn off. Air Delivery Mode Control :
Press
z,Y,
or
[to change the direction of the
airflow. Any combination of the three
controls can be selected. An indicator light
comes on in the selected mode button.
Changing the mode cancels the automatic
operation and the system goes into manual
mode. Press AUTO to return to automatic
operation.
To change the current mode, select one or
more of the following:
z: Air is directed to the windshield,
outboard a/c outlets, and side window
outlets.
Y: Air is directed to the a/c outlets.
[:Air is directed to the floor outlets,
with some air directed to the windshield,
outboard a/c outlets, and side window
outlets.
0MAX : Air is directed to the windshield
and the fan runs at a higher speed if not
already above a medium fan speed. This
mode overrides the previous mode selected
and clears fog or frost from the windshield
more quickly. When the control is pressed
again, the system returns to the previous
mode setting and fan speed. For best results, clear all snow and ice from
the windshield before defrosting.
@:
Press to turn on recirculation. An
indicator light comes on. Air is recirculated
to quickly cool the inside of the vehicle.
It can also be used to help reduce outside
air and odors that enter the vehicle.
Avoid using recirculation for long periods of
time in cold or damp conditions. Using
recirculation in cold or damp conditions can
result in window fogging.
A/C : Press to turn the air conditioning on
or off. An indicator light comes on to show
that the air conditioning is enabled. If the
fan is turned off, the air conditioner will not
run. The A/C light will stay on even if the
outside temperatures are below freezing.
Rear Window Defogger
1REAR : If equipped, press to turn the
rear window defogger on or off. An indicator
light on the button comes on to show that
the rear window defogger is on.
The rear window defogger only works when
the engine is running. The defogger turns
off if the ignition is turned off or to ACC/
ACCESSORY.

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13690484) - 2021 - crc - 8/17/20
Climate Controls 207
If equipped with heated outside mirrors,
press
fto turn them on or off. SeeHeated
Mirrors 029.
Caution
Using a razor blade or sharp object to
clear the inside rear window can damage
the rear window defogger. Repairs would
not be covered by the vehicle warranty.
Do not clear the inside rear window with
sharp objects.
Remote Start Climate Control Operation :
If equipped with remote start, the climate
control system may run when the vehicle is
started remotely. If equipped with heated or
ventilated seats or a heated steering wheel,
these features may come on during a
remote start. See Remote Vehicle Start 014,
Heated and Ventilated Front Seats 043, and
Heated Steering Wheel 094.
Sensors
The solar sensor, on top of the instrument
panel near the windshield, monitors the
solar heat.
The climate control system uses the sensor
information to adjust the temperature, fan
speed, recirculation, and air delivery mode
for best comfort.
Do not cover the sensor; otherwise the
automatic climate control system may not
work properly.
Rear Climate Control System
The rear climate control system is located
on the rear of the center console storage.
The rear climate settings can be adjusted
with this system.
1. Fan Control
2. TEMP (Temperature Control)
3. Heated Rear Seats (If Equipped)
4. MODE (Air Delivery Mode Control)
5. AUTO (Automatic Operation)
If the dual automatic climate control system
rear climate control lockout feature is
locked, the rear climate control settings can
only be adjusted from the front seat.

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13690484) - 2021 - crc - 8/17/20
Climate Controls 209
Rear System Air Vents
This vehicle has four round or rectangular
air vents in the headliner above the second
and third row seats.
Press on the center vane rear edge to open
the round outlet. Use the center vane to
rotate the outlet and change the direction
of the airflow. Press on the center vane
leading edge to shut off the air flow.
Move the slider knob on rectangular vents
and rotate the outlet barrel left to right to
change the direction of the air flow and to
shut off the air flow.
Operation Tips
.Clear away any ice, snow, or leaves from
the air inlets at the base of the
windshield that could block the flow of
air into the vehicle.
.Clear snow off the hood to improve
visibility and help decrease moisture
drawn into the vehicle.
.When you enter a vehicle in cold
weather, press the fan up button to the
maximum fan level before driving. This
helps clear the intake ducts of snow and
moisture, and reduces the chance of
fogging the inside of the window.
.Keep the air path under the front seats
clear of objects to help circulate the air
inside of the vehicle more effectively.
.Use of non-GM approved hood deflectors
can adversely affect the performance of
the system. Check with your dealer
before adding equipment to the outside
of the vehicle.
Maintenance
Passenger Compartment Air Filter
The filter reduces the dust, pollen, and other
airborne irritants from outside air that is
pulled into the vehicle.
The filter should be replaced as part of
routine scheduled maintenance. See
Maintenance Schedule0386. To find out
what type of filter to use, see Maintenance
Replacement Parts 0396.

Chevrolet Tahoe/Suburban Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13690484) - 2021 - crc - 8/17/20
Driving and Operating 221
Winter Driving
Driving on Snow or Ice
Snow or ice between the tires and the road
creates less traction or grip, so drive
carefully. Wet ice can occur at about 0 °C
(32 °F) when freezing rain begins to fall.
Avoid driving on wet ice or in freezing rain
until roads can be treated.
For Slippery Road Driving:
.Accelerate gently. Accelerating too quickly
causes the wheels to spin and makes the
surface under the tires slick.
.Turn on Traction Control. SeeTraction
Control/Electronic Stability Control 0242.
.The Antilock Brake System (ABS) improves
vehicle stability during hard stops, but
the brakes should be applied sooner than
when on dry pavement. See Antilock
Brake System (ABS) 0240.
.Allow greater following distance and
watch for slippery spots. Icy patches can
occur on otherwise clear roads in shaded
areas. The surface of a curve or an
overpass can remain icy when the
surrounding roads are clear. Avoid sudden
steering maneuvers and braking while
on ice.
.Turn off cruise control.
Blizzard Conditions
Stop the vehicle in a safe place and signal
for help. Stay with the vehicle unless there
is help nearby. If possible, use Roadside
Assistance. See Roadside Assistance Program
0 404. To get help and keep everyone in
the vehicle safe:
.Turn on the hazard warning flashers.
.Tie a red cloth to an outside mirror.
{Warning
Snow can trap engine exhaust under the
vehicle. This may cause exhaust gases to
get inside. Engine exhaust contains
carbon monoxide (CO), which cannot be
seen or smelled. It can cause
unconsciousness and even death.
If the vehicle is stuck in snow:
.Clear snow from the base of the
vehicle, especially any blocking the
exhaust pipe.
.Open a window about 5 cm (2 in) on
the vehicle side that is away from the
wind, to bring in fresh air.
(Continued)
Warning (Continued)
.Fully open the air outlets on or under
the instrument panel.
.Adjust the climate control system to
circulate the air inside the vehicle and
set the fan speed to the highest
setting. See“Climate Control Systems.”
For more information about CO, see
Engine Exhaust 0231.
To save fuel, run the engine for short
periods to warm the vehicle and then shut
the engine off and partially close the
window. Moving about to keep warm also
helps.
If it takes time for help to arrive, when
running the engine, push the accelerator
pedal slightly so the engine runs faster than
the idle speed. This keeps the battery
charged to restart the vehicle and to signal
for help with the headlamps. Do this as
little as possible, to save fuel.
If the Vehicle Is Stuck
Slowly and cautiously spin the wheels to
free the vehicle when stuck in sand, mud,
ice, or snow. See “Rocking the Vehicle to Get
It Out” later in this section.