2021 HYUNDAI SONATA Systems

03
3-31
ODN8039028
Forward-facing child restraints
A forward-facing child seat provides
restraint for the child’s body with a
harness. Keep children in a forward-
facing child seat with a harness until
they reach the top height or weight
limit allowed by your child restraint’s
manufacturer.
Once your child outgrows the forward-
facing child restraint, your child is ready
for a booster seat.
Booster seats
A booster seat is a restraint designed to
improve the fit of the vehicle’s seat belt
system. A booster seat positions the seat
belt so that it fits properly over the lap of
your child.
Keep your child in a booster seat until
they are big enough to sit in the seat
without a booster and still have the
seat belt fit properly. For a seat belt
to fit properly, the lap belt must lie
snugly across the upper thighs, not the
stomach. The shoulder belt should lie
snug across the shoulder and chest and
not across the neck or face. Children
under age 13 must always ride in the
rear seats and must always be properly
restrained to minimize the risk of injury.
Installing a Child Restraint
System (CRS)
WARNING
Before installing your child restraint
system always:
• Read and follow the instructions
provided by the manufacturer of the
child restraint.
• Read and follow the instructions
regarding child restraint systems in
this manual.
Failure to follow all warnings and
instructions could increase the risk of
the SERIOUS INJURY or DEATH if an
accident occurs.
WARNING
If the vehicle head restraint prevents
proper installation of a child seat as
described in the child seat system
manual, the head restraint of the
respective seating position shall be
readjusted or entirely removed.

03
3-47
Occupant Classification System
(OCS)
ODN8A039038
Your vehicle is equipped with an
Occupant Classification System (OCS) in
the front passenger’s seat.
Main components of the Occupant
Classification System
• A detection device located within the
front passenger seat cushion.
• Electronic system to determine
whether the passenger air bag
systems should be activated or
deactivated.
• An indicator light located on the
instrument panel which illuminates
the words “PASSENGER AIR BAG OFF”
indicating the front passenger air bag
system is deactivated.
• The instrument panel air bag indicator
light is interconnected with the OCS.
The OCS is designed to help detect
the presence of a properly-seated
front passenger and determine if the
passenger’s front air bag should be
enabled (may inflate) or not.
The purpose is to help reduce the risk
of injury or death from an inflating air
bag to certain front passenger seat
occupants, such as children, by requiring
the air bag to be automatically turned
OFF. For example, if a child restraint of the
type specified in the regulations is on the
seat, the occupant classification sensor
can detect it and cause the air bag to
turn OFF.
Front passenger seat adult occupants
who are properly seated and wearing the
seat belt properly, should not cause the
passenger air bag to be automatically
turned OFF. For small adults it may be
turned OFF, however, if the occupant
does not sit in the seat properly (for
example, by not sitting upright, by sitting
on the edge of the seat, or by otherwise
being out of position), this could cause
the sensor to turn the air bag OFF.
You will find the “PASSENGER AIR BAG
OFF” indicator on the center fascia
panel. This system detects the conditions
1-4 in the following table and activates or
deactivates the front passenger air bag
based on these conditions.
Always be sure that you and all vehicle
occupants are seated properly and
wearing the seat belt properly for the
most effective protection by the air bag
and the seat belt.
The OCS may not function properly if the
passenger takes actions which can affect
the classification system. These include:
•
Failing to sit in an upright position.
• Leaning against the door or center
console.
• Sitting towards the sides of the front
of the seat.
• Putting their legs on the dashboard or
resting them on other locations which
reduce the passenger weight on the
front seat.
• Wearing the seat belt improperly.
• Reclining the seatback.
• Wearing a thick cloth like ski wear or
hip protection wear.
• Putting an additional thick cushion on
the seat.
• Putting electrical devices (e.g.
notebook, satellite radio) on the seat
with inverter charging.

Instrument Cluster
4-8
Parking Brake & Brake Fluid
Warning Light
This warning light illuminates:
• When you place the ignition switch to
the ON position.
- The parking br

ake light illuminates
for about 3 seconds and will then
turn off once the parking brake is
released.
• Whenever the parking brake is
applied.
• Whenever the brake fluid level in the
reservoir is low.
- If the w

arning light illuminates
with the parking brake released, it
indicates that the brake fluid level in
the reservoir is low.
If the brake fluid level in the reservoir is
low:
1.

Driv
e carefully to the nearest safe
location and stop your vehicle.
2.

With the engine s
topped, check
the brake fluid level immediately
and add fluid as required (For more
information, refer to "Brake Fluid" in
chapter 8). After adding brake fluid,
check all brake components for fluid
leaks. If a brake fluid leak is found, or
if the warning light remains on, or if
the brakes do not operate properly, do
not drive the vehicle. Have the vehicle
inspected by an authorized HYUNDAI
dealer. Dual-diagonal braking system
Your vehicle is equipped with dual-
diagonal braking systems. This means
you still have braking on two wheels even
if one of the dual systems should fail.
With only one of the dual systems
working, more than normal pedal travel
and greater pedal pressure is required to
stop the vehicle.
If the brakes fail while you are driving,
shift to a lower gear for additional engine
braking and stop the vehicle as soon as it
is safe to do so.
WARNING
Parking Brake & Brake Fluid Warning
Light
Driving the vehicle with a warning light
ON is dangerous. If the Parking Brake &
Brake Fluid Warning Light illuminates
with the parking brake released, it
indicates that the brake fluid level is
low.
In this case, have the vehicle inspected
by an authorized HYUNDAI dealer.

Instrument Cluster
4-12
Master Warning Light
This indicator light illuminates:
When there is a malfunction in operation
in any of the following systems:
- F
orward Collision-Avoidance Assist
system malfunction (if equipped)
- F

orward Collision-Avoidance Assist
radar blocked (if equipped)
- Blind-

Spot Collision Warning system
malfunction (if equipped)
- Blind-

Spot Collision Warning radar
blocked (if equipped)
- High Beam Assis

t malfunction (if
equipped)
- Lamp malfunction (if equipped)
- Smart Cruise Con

trol malfunction (if
equipped)
- Tir

e Pressure Monitoring System
(TPMS) malfunction (if equipped)
To identify the details of the warning,
look at the LCD display.
Low Tire Pressure Warning
Light (if equipped)
This warning light illuminates:
• When you place the ignition in the ON
position.
- It illumina

tes for approximately 3
seconds and then goes off.
• When one or more of your tires are
significantly underinflated. (The
location of the underinflated tires is
displayed on the LCD display.)
For more information, refer to "Tire
Pressure Monitoring System (TPMS)" in
chapter 7. This warning light remains ON after
blinking for approximately 60 seconds, or
repeatedly blinks ON and OFF in 3 second
intervals:
When there is a malfunction with the
TPMS.
In this case, have the vehicle inspected
by an authorized HYUNDAI dealer as
soon as possible.
For more information, refer to "Tire
Pressure Monitoring System (TPMS)" in
chapter 7.
WARNING
Safe Stopping
•
The TPMS cannot alert you to severe
and sudden tire damage caused by
external factors.
• If you notice any vehicle instability,
immediately take your foot off the
accelerator pedal, apply the brakes
gradually with light force, and slowly
move to a safe position off the road.
Electronic Stability Control
(ESC) Indicator Light
This indicator light illuminates:
• When you place the ignition switch to
the ON position.
- The Electr

onic Stability Control
indicator light illuminates for about
3 seconds and then goes off.
• Whenever there is a malfunction with
the ESC system.
If this occurs, have the vehicle
inspected by an authorized HYUNDAI
dealer.
This indicator light blinks:
While the ESC is operating.
For more information, refer to
“Electronic Stability Control (ESC)” in
chapter 6.

Instrument Cluster
4-20
LCD Display Modes
ModesSymbol Explanation
Trip Computer
This mode displays driving information such as the
tripmeter, fuel economy, etc.
Turn By Turn (TBT)
This mode displays the state of the navigation.
Drive Assist
(if equipped)
This mode displays the state of: - Smart Cruise Con trol system
Lane Following Assist system
Lane Keeping Assist system
- Driv

er Attention Warning system
- Tir

e pressure
User Settings
The User Settings menu provides user options for
a variety of settings including door lock/unlock
features, convenience features, driver assistance
settings, etc.
Master Warning
The Warning mode displays warning messages
related to the vehicle when one or more systems is
not operating normally.
The information provided may differ depending on which functions are applicable
to your vehicle.

04
4-23
OOSEV048172L
Shift to P to edit settings
This warning message appears if you try
to adjust the User Settings while driving.
For your safety, change the User Settings
after parking the vehicle, applying the
parking brake and shifting to P (Park).
Quick guide help
This mode provides quick guides for the
systems in the User Settings mode.
Select an item, press and hold the OK
button.
For more information, about each
system, refer to this Owner's Manual.

04
4-37
Driving Assist view mode
ODN8A049035
LKA, DAW, LFA, SCC
This mode displays the state of Lane
Keeping Assist, Driver Attention Warning,
Lane Following Assist, Smart Cruise
Control systems.
For more information, refer to each
system information in chapter 6.
Turn By Turn (TBT) view mode
ODN8A049025
It shows the information by interworking
with the navigation
Parking Assist view mode
ODN8A049026
It displays the information related to the
parking assist system movement.

04
4-39
Warning message mode
ODN8A059295
When the warning message light appears
in the option menu, press the OK button
and check the detailed information.
User Settings Mode
In this mode, you can change the
settings of the instrument cluster, doors,
lamps, etc.
1. Head-up display
2. Driver assistance
3. Door
4. Lights
5. Sound
6. Convenience
7. Service interval
8. Other
9. Language
10. Reset
The information provided may differ
depending on which functions are
applicable to your vehicle.
OOSEV048172L
Shift to P to edit settings
This warning message appears if you try
to adjust the User Settings while driving.
For your safety, change the User Settings
after parking the vehicle, applying the
parking brake and shifting to P (Park).
Quick guide help
This mode provides quick guides for the
systems in the User Settings mode.
Select an item, press and hold the OK
button.
For more information, about each
system, refer to this Owner's Manual.