2020 HYUNDAI SONATA HYBRID maintenance

5
Forward/Reverse Parking Distance Warning (PDW) .....................................5-91Operation of Forward/Reverse Parking Distance Warning System ........................5-92
Non-Operational Conditions of Forward/
Reverse Parking Distance Warning System
.............................................................5-94
Forward/Reverse Parking Distance Warning System Precautions ........................5-94
Reverse Parking Collision-Avoidance Assist (PCA) .......................................5-95System Setting and Operation ........................................................................\
..........5-95
Warning and System Control ........................................................................\
............5-96
Detecting Sensor ........................................................................\
...............................5-98
System Malfunction ........................................................................\
..........................5-99
Limitations of the System ........................................................................\
.................5-99
Automatic Climate Control System ..............................................................5-101Automatic Heating and Air Conditioning ...............................................................5-102
Manual Temperature Control Mode ........................................................................\
5-103
System Operation ........................................................................\
.............................5-109
System Maintenance ........................................................................\
.........................5-111
Windshield Defrosting and Defogging ..........................................................5-113To Defog Inside Windshield ........................................................................\
..............5-113
To Defog Outside Windshield ........................................................................\
...........5-114
Defogging Logic ........................................................................\
................................5-114
Auto Defogging System ........................................................................\
....................5-115
Defroster ........................................................................\
............................................5-116
Climate Control Additional Features .............................................................5-117Sunroof Inside Air Recirculation ........................................................................\
.......5-117
Automatic Ventilation ........................................................................\
.......................5-117
Smart Seat Warmer/Air Ventilation Seat
(Automatic Control Interworking with the Driver’s Seat System)
..........................5-117
Washer Fluid Logic ........................................................................\
............................5-117
Storage Compartment ........................................................................\
...........5-118Center Console Storage ........................................................................\
....................5-118
Glove Box ........................................................................\
...........................................5-118
5. Convenient Features

Convenient Features
5-12
WARNING
In order to prevent theft of your
vehicle, do not leave spare keys
anywhere in your vehicle. Your
immobilizer password is a customer
unique password and should be kept
confidential.
NOTICE
The transponder in your key is an
important part of the immobilizer
system. It is designed to give years
of trouble-free service, however you
should avoid exposure to moisture,
static electricity and rough handling.
Immobilizer system malfunction could
occur.
Information
This device complies with Part 15 of the
FCC rules.
Operation is subject to the following three
conditions:
1. This device may not cause harmful
interference.
2. This device must accept any
interference received, including
interference that may cause undesired
operation.
3. Changes or modifications not expressly
approved by the party responsible
for compliance could void the user’s
authority to operate the device
Hyundai Digital Key (if equipped)
Digital Key Application
To use Hyundai Digital Key mobile app,
you should install Hyundai digital key
application. Search ‘Hyundai digital key’
in the Google Play Store and download
the app. Please refer to the detailed
manual of the digital key app. The option
can be found under the following app
menu:
Menu → Application Info → Tutorial
Please note the manual before using the
app.
ÃThis service is only available for
Android smartphones. Please confirm
supported/compatible devices on our
website.
WARNING
For used vehicle
If any of the digital key (smartphone key
or card key) is already registered when
you press ON button after unlocking the
doors, the message ‘Digital key(s) active’
appears on the instrument cluster once.
If you buy a used vehicle, you should
confirm the message and delete the
registered smartphone key and card key.
In addition, please notify the Hyundai
Customer Care Center.
If the card key does not work properly,
please delete the card key and register
the smartphone key and re-register the
card key.
For vehicle maintenance
If you need to have your Digital Key
System repaired or replaced please
ensure you Smartphone Key is still active.
You may have to pair your phone again.
In the case, re-initialize your Digital Keys
using the Hyundai Digital Key mobile
app.

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
5-111
System Maintenance
Cabin air filter
OIK047401L[A] : Outside air, [B] : Recirculated air
[C] : Cabin air filter, [D] : Blower
[E] : Evaporator core, [F] : Heater core
The cabin air filter is installed behind
the glove box. It filters the dust or other
pollutants that enter the vehicle through
the heating and air conditioning system.
Have the cabin air filter replaced by an
authorized HYUNDAI dealer according to
the maintenance schedule. If the vehicle
is being driven in severe conditions such
as dusty or rough roads, more frequent
cabin air filter inspections and changes
are required.
If the air flow rate suddenly decreases,
the system should be checked at an
authorized HYUNDAI dealer.
Checking the amount of air
conditioner refrigerant and
compressor lubricant
When the amount of refrigerant is low,
the performance of the air conditioning
is reduced. Overfilling also reduces the
performance of the air conditioning
system.
Therefore, if abnormal operation is
found, have the system inspected by an
authorized HYUNDAI dealer.
NOTICE
It is important that the correct type and
amount of oil and refrigerant is used.
Otherwise, damage to the compressor
and abnormal system operation may
occur. To prevent damage, the air
conditioning system in your vehicle
should only be serviced by trained and
certified technicians. +

06
6-137
Chain installation
When installing tire chains, follow the
manufacturer’s instructions and mount
them as tightly possible. Drive slowly
(less than 20 mph (30 km/h)) with
chains installed. If you hear the chains
contacting the body or chassis, stop and
tighten them. If they still make contact,
slow down until the noise stops. Remove
the tire chains as soon as you begin
driving on cleared roads.
When mounting snow chains, park the
vehicle on level ground away from traffic.
Turn on the vehicle Hazard Warning
Flasher and place a triangular emergency
warning device behind the vehicle (if
available). Always place the vehicle in P
(Park), apply the parking brake and turn
off the engine before installing snow
chains.
NOTICE
When using tire chains:
• Wrong size chains or improperly
installed chains can damage your
vehicle's brake lines, suspension,
body and wheels.
• Use SAE "S" class or wire chains.
• If you hear noise caused by chains
contacting the body, retighten the
chain to prevent contact with the
vehicle body.
• To prevent body damage, retighten
the chains after driving 0.3~0.6 miles
(0.5~1.0 km).
• Do not use tire chains on vehicles
equipped with aluminum wheels. If
unavoidable, use a wire type chain.
• Use wire chains less than 0.59 inch
(15mm) wide to prevent damage to
the chain’s connection.
Winter Precautions
Use high quality ethylene glycol
coolant
Your vehicle is delivered with high
quality ethylene glycol coolant in the
cooling system. It is the only type of
coolant that should be used because it
helps prevent corrosion in the cooling
system, lubricates the water pump and
prevents freezing. Be sure to replace or
replenish your coolant in accordance
with the maintenance schedule in
chapter 8. Before winter, have your
coolant tested to assure that its freezing
point is sufficient for the temperatures
anticipated during the winter.
Change to "winter weight" oil if
necessary
In some climates it is recommended that
a lower viscosity "winter weight" oil be
used during cold weather. See chapter 8
for recommendations. If you aren't sure
what weight oil you should use, consult
an authorized HYUNDAI dealer.
Check battery and cables
Winter puts additional burdens on the
battery system. Visually inspect the
battery and cables as described in
chapter 8. The level of charge in your
battery can be checked by an authorized
HYUNDAI dealer or a service station.

Emergency situations
7-10
Tire Pressure Monitoring System
WARNING
Over-inflation or under-inflation can
reduce tire life, adversely affect vehicle
handling, and lead to sudden tire failure
that may cause loss of vehicle control
resulting in an accident.
Each tire, including the spare (if
provided), should be checked monthly
when cold and inflated to the inflation
pressure recommended by the vehicle
manufacturer on the vehicle placard
or tire inflation pressure label. (If your
vehicle has tires of a different size than
the size indicated on the vehicle placard
or tire inflation pressure label, you should
determine the proper tire inflation
pressure for those tires.)
As an added safety feature, your
vehicle has been equipped with a tire
pressure monitoring system (TPMS)
that illuminates a low tire pressure
telltale when one or more of your tires is
significantly under-inflated. Accordingly,
when the low tire pressure telltale
illuminates, you should stop and check
your tires as soon as possible, and inflate
them to the proper pressure. Driving on
a significantly under-inflated tire causes
the tire to overheat and can lead to tire
failure.
Under-inflation also reduces fuel
efficiency and tire tread life, and may
affect the vehicle’s handling and
stopping ability.
Please note that the TPMS is not a
substitute for proper tire maintenance,
and it is the driver’s responsibility to
maintain correct tire pressure, even if
under-inflation has not reached the level
to trigger illumination of the TPMS low
tire pressure telltale.
Your vehicle has also been equipped with
a TPMS malfunction indicator to indicate
when the system is not operating
properly. The TPMS malfunction
indicator is combined with the low
tire pressure telltale. When the system
detects a malfunction, the telltale will
flash for approximately one minute and
then remain continuously illuminated.
This sequence will continue upon
subsequent vehicle start-ups as long as
the malfunction exists.
When the malfunction indicator is
illuminated, the system may not be able
to detect or signal low tire pressure as
intended. TPMS malfunctions may occur
for a variety of reasons, including the
installation of replacement or alternate
tires or wheels on the vehicle that
prevent the TPMS from functioning
properly.
Always check the TPMS malfunction
telltale after replacing one or more tires
or wheels on your vehicle to ensure that
the replacement or alternate tires and
wheels allow the TPMS to continue to
function properly.
NOTICE
If any of the below happens, have
the system checked by an authorized
HYUNDAI dealer.
1. The Low Tire Pressure Telltale/TPMS
Malfunction Indicator does not
illuminate for 3 seconds when the
Engine Start/Stop button is pressed
to the ON position or the vehicle is in
the ready (
) mode.
2. The TPMS Malfunction Indicator
remains illuminated after blinking for
approximately 1 minute.
3. The Low Tire Pressure Position
Telltale remains illuminated.

8. Maintenance
Engine Compartment ........................................................................\
...............8-3
Maintenance Services
........................................................................\
..............8-4Owner’s Responsibility ........................................................................\
.......................8-4
Owner Maintenance Precautions ........................................................................\
.......8-4
Owner Maintenance ........................................................................\
.................8-5Owner Maintenance Schedule ........................................................................\
............8-5
Scheduled Maintenance Services ....................................................................8 -7Normal Maintenance Schedule ........................................................................\
..........8-8
Maintenance Under Severe Usage Conditions .........................................................8-11
Explanation of Scheduled Maintenance Items ..............................................8-13
Engine Oil
........................................................................\
.................................8-15Checking the Engine Oil Level ........................................................................\
...........8-15
Checking the Engine Oil and Filter ........................................................................\
...8-16
Engine Coolant/Inverter Coolant ....................................................................8-17Checking the Coolant Level ........................................................................\
................ 8-17
Changing Coolant ........................................................................\
..............................8-19
Hybrid Starter & Generator (HSG) Belt ..........................................................8-20Checking the Hybrid Starter & Generator (HSG) Belt .............................................8-20
Brake Fluid ........................................................................\
...............................8-20Checking the Brake Fluid Level ........................................................................\
........8-20
Washer Fluid ........................................................................\
.............................8-21Checking the Washer Fluid Level ........................................................................\
......8-21
Air Cleaner ........................................................................\
...............................8-22Filter Replacement ........................................................................\
.............................8-22
Cabin Air Filter ........................................................................\
.........................8-23Filter Inspection ........................................................................\
.................................. 8-23
Filter Replacement ........................................................................\
.............................8-23
Wiper Blades ........................................................................\
...........................8-24Blade Inspection ........................................................................\
................................8-24
Blade Replacement
........................................................................\
............................8-24
Maintenance
8

Tires and Wheels ........................................................................\
.....................8-25Tire Care ........................................................................\
..............................................8-26
Recommended Cold Tire Inflation Pressures ...........................................................8-26
Check Tire Inflation Pressure ........................................................................\
.............8-27
Tire Rotation ........................................................................\
.......................................8-27
Wheel Alignment and Tire Balance ........................................................................\
...8-28
Tire Replacement ........................................................................\
...............................8-28
Wheel Replacement ........................................................................\
..........................8-30
Tire Traction ........................................................................\
.......................................8-30
Tire Maintenance ........................................................................\
............................... 8-30
Tire Sidewall Labeling
........................................................................\
.......................8-30
Tire Terminology and Definitions ........................................................................\
......8-33
All Season Tires ........................................................................\
..................................8-36
Summer Tires ........................................................................\
....................................8-36
Snow Tires ........................................................................\
.......................................... 8-36
Radial-Ply Tires
........................................................................\
..................................8-36
Low Aspect Ratio Tires ........................................................................\
.......................8-37
Fuses ........................................................................\
........................................8-38Instrument Panel Fuse Replacement .......................................................................8-39
Engine Compartment Panel Fuse Replacement .....................................................8-40
Fuse/Relay Panel Description ........................................................................\
............ 8-41
Light Bulbs ........................................................................\
...............................8-43Headlamp, Parking Lamp, Daytime Running Light,
Turn Signal Lamp and Side Marker Replacement ...................................................8-44
Side Repeater Lamp Replacement ........................................................................\
..8-45
Rear Combination Lamp Replacement ...................................................................8-45
High Mounted Stop Lamp Replacement ..................................................................8-47
License Plate Light Bulb Replacement ....................................................................8-48
Interior Lamp Replacement ........................................................................\
..............8-48
Appearance Care ........................................................................\
....................8-50Exterior Care ........................................................................\
......................................8-50
Interior Care ........................................................................\
.......................................8-54
Emission Control System ........................................................................\
........8-57Crankcase Emission Control System ........................................................................\
8-57
Evaporative Emission Control System Including
Onboard Refueling Vapor Recovery (ORVR)
............................................................8-57
Exhaust Emission Control System ........................................................................\
....8-58
8