
Safety System
3-16
Front
ODN8039019
While the engine is running, push either
of the switches to warm the driver’s seat
or front passenger’s seat.
During mild weather or under conditions
where the operation of the seat warmer
is not needed, keep the switches in the
OFF position.
• Manual temperature control
Each time you push the switch, the
temperature setting of the seat is
changed as follows:
-Front seat
LOW ( ) ← MIDDLE (
) → HIGH (
)
OFF → HIGH (
) → HIGH (
)
UP
UP
DOWN
DOWN
↑
↓ DOWN
UP
• Automatic temperature control
The seat warmer starts to
automatically control the seat
temperature in order to prevent
low-temperature burns after being
manually turned ON.
-Front seat
OFF →
←
↑
↓ 30 MIN
60 MIN
LOW ( )
HIGH ( )
MIDDLE ( )
You may manually press the switch to
increase seat temperature. However, it
soon returns the automatic mode again.
• When pressing the switch for more
than 1.5 seconds with the seat warmer
operating, the seat warmer will turn
OFF.
• The seat warmer defaults to the OFF
position whenever the ignition switch
is in the ON position. However, if the
Auto Comfort Control function is ON,
the driver’s seat warmer will turn on
and off depending on the ambient
temperature.
• Auto Comfort Control (for driver’s
seat, if equipped)
The seat warmer automatically
controls the seat temperature
depending on the ambient
temperature when the engine is
running. If the seat warmer switch
is pushed, the seat warmer will have
to be controlled manually. To use
this function, it must be activated
from the Settings menu in the AVN
system screen. For more information,
refer to the separately supplied Car
Infotainment System manual.

03
3-17
Front air ventilation seat
(if equipped)
ODN8039023
The air ventilation seats are provided
to cool the front seats by blowing air
through small vent holes on the surface
of the seat cushions and seatbacks.
When the operation of the air ventilation
seat is not needed, keep the switches in
the OFF position.
While the engine is running, push the
switch to cool the driver’s seat or the
front passenger’s seat. •
Each time you push the switch, the
airflow changes as follows:
LOW ( ) ← MIDDLE (
) → HIGH (
)
OFF → HIGH (
) → HIGH (
)
DOWN
DOWN
UP
UP ↑
↓ UP
DOWN
• When pressing the switch for
more than 1.5 seconds with the
air ventilation seat operating, the
operation will turn OFF.
• The air ventilation seat defaults to the
OFF position whenever the ignition
switch is in the ON position. However,
if the Auto Comfort Control function
is ON, the driver’s air ventilation seat
will turn on and off depending on the
ambient temperature.
• Auto Comfort Control (for driver’s
seat, if equipped)
The air ventilation seat automatically
controls the seat temperature
depending on the ambient
temperature when the engine is
running. If the air ventilation seat
switch is pushed, the seat warmer will
have to be controlled manually. To
use this function, it must be activated
from the Settings menu in the AVN
system screen. For more information,
refer to the separately supplied Car
Infotainment System manual.

04
4-35
8. Other
ItemsExplanation
Fuel Econ. Reset •
Off: The average fuel economy will not reset automatically
whenever refueling.
• After ignition: When the engine has been OFF for 4 hours or
longer the average fuel economy will reset automatically.
• After refueling: The average fuel economy will reset
automatically after adding 1.6 gallons (6 liters) of fuel or more
and after driving speed exceeds 1 mph (1 km/h).
For more information, refer to “Trip Computer” in this
chapter.
Speed Unit (if equipped) To select the speed unit. (km/h, MPH)
Fuel Econ. Unit To select the fuel economy unit.
Temperature Unit To select the temperature unit. (°C,°F)
Tire Pressure Unit To select the tire pressure unit. (psi, kPa, bar)
9. ECO vehicle
Items
Explanation
Coasting Guide •
Enable Coasting Guide : On/Off
To inform driver when taking foot off from accelerator pedal
by getting information from Navigation system.
• Sound
To adjust the sound of coasting guide.
Start Coasting •
Early/Normal/Late
To select options when Coasting Pop-up is displayed.
10. Language (if equipped)
Items Explanation
Language Choose the language. You can choose the language in infotainment
system. (if equipped)
11. Reset
Items
Explanation
Reset You can reset the menus in the User Settings Mode. All menus in the
User Settings Mode are reset to factory settings, except language
and service interval.
Ã
The information provided may differ depending on which functions are applicable
to your vehicle.

Interior Features ........................................................................\
......................5-119Cup Holder ........................................................................\
.........................................5-119
Sunvisor ........................................................................\
............................................5-120
Power Outlet ........................................................................\
.....................................5-120
USB Charger ........................................................................\
......................................5-121
Wireless Cellular Phone Charging System ..............................................................5-122
Clock ........................................................................\
.................................................5-124
Clothes Hanger ........................................................................\
.................................5-124
Floor Mat Anchor(s) ........................................................................\
...........................5-125
Side Curtain ........................................................................\
.......................................5-125
Infotainment System ........................................................................\
.............5-126USB and iPod® Port ........................................................................\
..........................5-126
Antenna ........................................................................\
.............................................5-126
Steering Wheel Audio Control ........................................................................\
..........5-127
Bluetooth® Wireless Technology Hands-Free .........................................................5-128
Audio (Display Audio) / Video / Navigation System
...............................................5-128
5
![HYUNDAI SONATA HYBRID 2021 Owners Manual Convenient Features
5-14
4. Register your Digital key from the
vehicle user setting menu as follows.
ÃWith Navigation screen :
From the infotainment screen menu,
go to [Setup] - [Vehicle] - [Digit HYUNDAI SONATA HYBRID 2021 Owners Manual Convenient Features
5-14
4. Register your Digital key from the
vehicle user setting menu as follows.
ÃWith Navigation screen :
From the infotainment screen menu,
go to [Setup] - [Vehicle] - [Digit](/manual-img/35/56189/w960_56189-161.png)
Convenient Features
5-14
4. Register your Digital key from the
vehicle user setting menu as follows.
ÃWith Navigation screen :
From the infotainment screen menu,
go to [Setup] - [Vehicle] - [Digital Key]
- [Smart Phone Key] then select the
[Save] from submenu.
ÃWithout navigation screen :
From cluster menu, go to [Digital Key]
- [Smart Phone Key] and select [Save].
The saving process will begin
automatically.
Information
The [Save] button will be disabled if the
digital key (Smartphone key) is already
saved.
Please refer to “Digital Key Delete” in this
manual and follow the digital key delete
procedure in your car before Digital key
save.
Please refer to the ‘Tutorial’ on your
Digital key app and delete the previous
saved key in your smartphone before save.
5. Once the digital key save is complete,
a message will be shown on the
infotainment screen or cluster.
6. Remove the smartphone from the pad
and complete the saving process.
ODN8059267[A] : Wireless Charging Pad (In-vehicle Authentication Pad)
ODN8A059129
ODN8A059130
Hyundai Digital Key (Smartphone Key)
Deletion
1. Turn the vehicle on with the Smart
key and make sure to keep the smart
key inside the vehicle during delete
process.
2. Delete your Digital key from the
vehicle user setting menu as follows.
ÃWith Navigation screen :
From the infotainment screen menu,
go to [Setup] - [Vehicle] - [Digital Key]
- [Smart Phone Key] then select the
[Delete] from submenu.
ÃWithout navigation screen :
From cluster menu, go to [Digital
Key] - [Smart Phone Key] and select
[Delete].
Information
The [Delete] button will be disabled if
there is no digital key (Smartphone key)
saved.
![HYUNDAI SONATA HYBRID 2021 Owners Manual 05
5-15
3. Once the digital key delete is
complete, a message will be shown
on the infotainment screen or cluster.
4. Go to [Initialize Digital Key] menu on
the digital key application and select
HYUNDAI SONATA HYBRID 2021 Owners Manual 05
5-15
3. Once the digital key delete is
complete, a message will be shown
on the infotainment screen or cluster.
4. Go to [Initialize Digital Key] menu on
the digital key application and select](/manual-img/35/56189/w960_56189-162.png)
05
5-15
3. Once the digital key delete is
complete, a message will be shown
on the infotainment screen or cluster.
4. Go to [Initialize Digital Key] menu on
the digital key application and select
the vehicle to delete the digital key
information.
•
Open the Hyundai Digital Key app → Menu → Initialize Digital Key
à If the saved digital key information
in your car is deleted due to vehicle
maintenance, the digital key in your
smartphone should be deleted as well.
ÃFor more information, please refer to
the ‘Tutorial’ on your Digital key app.
CAUTION
• If the smartphone is removed
from the interior authentication
pad during enrollment, the saving
process will be cancelled.
• If the infotainment or instrument
cluster screen is changed during
enrollment, the saving process will
be cancelled.
• If the vehicle is turned off during
enrollment, the saving process will
be cancelled.
• If the gear is shifted, the saving
process will be cancelled.
• If you try to save the smartphone
which is not logged in with the
vehicle owner’s ID or if you try to
save the Card key, the saving process
will not begin.
• If the NFC setting on your
smartphone is off, the saving process
will not begin.
• If the smartphone screen is changed
to off or locked status, the saving
process will be cancelled.
• If there is no Smart key during the
save process, the saving process will
not begin. Set up main vehicle
You can manage multiple digital keys
from the Digital key app. From the list of
digital keys you own, select the vehicle
you want to make your priority vehicle.
For more information, please refer to
the ‘Tutorial’ on your Digital key app.

05
5-21
ÃIf a sharer changes or reset the
smartphone, the key should be re-
shared from owner.
ÃSome of the old smartphone may
not work properly. Please check the
available smartphone models with
your dealer.
ÃNFC antenna position on the
smartphone can be confirmed
on each smartphone’s manual or
contact to customer service center
of the smartphone manufacture.
Digital key (Card key)
ODN8A059243
ODN8A059131
Digital key (Card key) save
1. Install Hyundai digital key app in
main user’s smartphone and register
the digital key (smartphone). Please
refer to the registration method of the
digital key (smartphone).
2. User can register Card Key in the
Digital Key Mobile App by tapping
“Full Menu” icon at the top-left
corner, Pair Card Key, and selecting
NFC or BLE Authentication.
ÃNFC authentication : enter the NFC
authentication menu and contact
the smartphone on the outside door
handle.
ÃBluetooth authentication : enter the
Bluetooth authentication menu and
press the [OK] button for activation.
If you activate the registration mode,
you should complete the Card saving
process with in 5 minutes.
3. Place the NFC card key onto the
interior authentication pad (wireless
charger).
4. Register the NFC card key on the
User’s Settings menu after turning on
the vehicle.
ÃWith Navigation screen : From the
infotainment screen menu, go to
[Setup] - [Vehicle] - [Digital Key] -
[Card Key] then select the [Save] from
submenu.
ÃWithout navigation screen : From
cluster menu, go to [Digital Key] -
[Card Key] and select [Save].
The saving process will begin
automatically.
Information
The [Save] button will be disabled if the
digital key (Card key) is already saved.
Please refer to “Digital Key Delete” in this
manual and follow the digital key delete
procedure in your car before Digital key
save.

Convenient Features
5-22
5. If the key is enrolled, the message
will be displayed on the infotainment
screen or instrument cluster.
• Once the card key registration mode
is activated, the process should be
completed within 5 minutes. After
then, you should reactivate once
again for registration.
• For the digital key(card key) saving,
the smart key(fob) must be exist inside
of vehicle.
• Once a Card key is registered, it
cannot be reuse onto another vehicle.
ODN8A059243
ODN8A059132
Digital key (Card key) deletion
You should have the smart key to delete
the digital key (card key) so please carry
around the key.
1. Get on the vehicle with the smart key.
2. Delete the NFC card key on the User’s
Settings menu after turning on the
engine.
ÃWith Navigation screen : From the
infotainment screen menu, go to
[Setup] - [Vehicle] - [Digital Key] -
[Card Key] then select the [Delete]
from submenu.
ÃWithout navigation screen : From
cluster menu, go to [Digital Key] -
[Card Key] and select [Delete].
If there is no saved digital key(card key),
[Delete] menu will not be activated.
• To delete the saved digital key (card
key), the smart key must be exist
inside the vehicle.
• The deleted digital key (card key) can
be re-registered before registering a
new digital key (card key).
• If you try to register a new digital key
(card key), the previously registered
digital key (card key) cannot be used
again.