2021 HYUNDAI SONATA HYBRID brake fluid

Maintenance
8-20
Checking the Hybrid Starter &
Generator (HSG) Belt
Have the Hybrid Starter & Generator
(HSG) belt inspected or replaced
according to the Maintenance Schedule
in this chapter by an authorized
HYUNDAI dealer.
CAUTION
When the HSG belt is worn out or
damaged, replace the belt.
Otherwise, it may cause engine
overheating or battery discharge.
WARNING
• Turn the vehicle off while you inspect
the engine or Hybrid Starter &
Generator (HSG) belt. Otherwise it
may result in serious injury.
• Keep hands, clothing etc. away from
the Hybrid Starter & Generator (HSG)
belt.
Checking the Brake Fluid Level
ODN8H089005
Check the fluid level in the reservoir
periodically. The fluid level should be
between MAX and MIN marks on the side
of the reservoir.
Before removing the reservoir cap and
adding brake fluid, clean the area around
the reservoir cap thoroughly to prevent
brake fluid contamination.
If the level is low, add the specified brake
fluid to the MAX level. The level will fall
with accumulated mileage. This is a
normal condition associated with the
wear of the brake linings. If the fluid level
is excessively low, have the brake system
checked by an authorized HYUNDAI
dealer.
WARNING
If the brake system requires frequent
additions of fluid this could indicate
a leak in the brake system. Have the
vehicle inspected by an authorized
HYUNDAI dealer.
HYBRID STARTER &
GENERATOR (HSG) BELT BRAKE FLUID

08
8-21
WASHER FLUID
Checking the Washer Fluid Level
ODN8H089006
Check the fluid level in the washer fluid
reservoir and add fluid if necessary. Plain
water may be used if washer fluid is not
available. However, use washer solvent
with antifreeze characteristics in cold
climates to prevent freezing.
WARNING
To prevent serious injury or death, take
the following safety precautions when
using washer fluid:
• Do not use engine coolant or
antifreeze in the washer fluid
reservoir. Engine coolant can
severely obscure visibility when
sprayed on the windshield and
may cause loss of vehicle control
resulting in an accident or damage to
paint and body trim.
• Do not allow sparks or flame to
contact the washer fluid or the
washer fluid reservoir. Washer fluid
may contain alcohol and can be
flammable.
• Do not drink washer fluid and avoid
contact with skin. Washer fluid is
harmful to humans and animals.
• Keep washer fluid away from
children and animals.
WARNING
Do not allow brake fluid to come in
contact with your eyes. If brake fluid
comes in contact with your eyes, flush
your eyes with clean water for at least
15 minutes and get immediate medical
attention.
NOTICE
• Do not allow brake fluid to contact
the vehicle’s body paint, as paint
damage will result.
• Brake fluid, which has been exposed
to open air for an extended time
should NEVER be used as its quality
cannot be guaranteed. It should be
disposed of properly.
• Do not use the wrong kind of brake
fluid. A few drops of mineral based
oil, such as engine oil, in your brake
system can damage brake system
parts.
Information
Use only the specified brake fluid (refer
to “Recommended Lubricants and
Capacities” section in chapter 2).

I
I-3
Automatic climate control system ....................................................................5-101
Automatic heating and air conditioning
........................................................5-102
Manual temperature control mode
................................................................5-103
Mode selection
........................................................................\
......................5-104
Instrument panel vents
........................................................................\
..........5-106
Temperature control
........................................................................\
..............5-106
Air intake control
........................................................................\
..................5-107
Fan speed control
........................................................................\
..................5-108
Driver only
........................................................................\
............................6-108
Air conditioning
........................................................................\
....................5-109
OFF mode ........................................................................\
.............................. 5-109
System operation
........................................................................\
...................5-109
System maintenance
........................................................................\
...............5-111
Air conditioning refrigerant label .................................................................. 5-112
Automatic transmission
........................................................................\
...............6-10
Shift-lock system
........................................................................\
.....................6-12
Parking
........................................................................\
....................................6-13
Good driving practices
........................................................................\
............6-15
Paddle shifter (manual shift mode)
.................................................................6-16
USB and iPod® port ........................................................................\
...................5-126
B
Battery saver function
........................................................................\
..................5-77
Before driving
........................................................................\
................................6-5
Blind-Spot Collision Warning (BCW)
.................................................................6-65
Blind-Spot Collision-Avoidance Assist (BCA)
...................................................6-65
Blind-Spot View Monitor (BVM)
.......................................................................6-86
Blue Link® center
........................................................................\
.....................5-128
Bluetooth® Wireless Technology hands-free
....................................................5-128
Brake fluid
........................................................................\
...................................8-20
Brake system
........................................................................\
................................6-18
Power brakes
........................................................................\
..........................6-18
Disc brakes wear indicator
........................................................................\
.....6-19
Electronic Parking Brake (EPB)
....................................................................6-19
Auto Hold
........................................................................\
...............................6-24
Anti-lock Brake System (ABS)
......................................................................6-27

I
I -7
Exterior features........................................................................\
........................... 5-62
Hood
........................................................................\
.......................................5-62
Trunk
........................................................................\
......................................5-63
Emergency trunk safety release ....................................................................... 5-64
Fuel Filler Door
........................................................................\
......................5-68
Exterior overview
........................................................................\
..........................2-2
Front view
........................................................................\
................................2-2
Rear view
........................................................................\
.................................2-3
F
Flat tire
........................................................................\
........................................7-14
Changing spare tire
........................................................................\
.....................7-15
Floor mat anchor(s) ........................................................................\
.................... 5-125
Fluid
........................................................................\
...................................................-
Brake fluid
........................................................................\
..............................8-20
Washer fluid
........................................................................\
...........................8-21
Forward Collision-Avoidance Assist (FCA)
.......................................................6-38
Junction Turning ........................................................................\
...................... 6-53
Forward/Reverse Parking Distance Warning (PDW)
.........................................5-91
Front seat adjustment
........................................................................\
....................3-5
Manual adjustment
........................................................................\
...................3-5
Power adjustment
........................................................................\
.....................3-7
Reclining seatback
........................................................................\
...................3-8
Front seat head restraints
........................................................................\
.............3-12
Adjusting the height up and down
.................................................................3-12
Removal/Reinstallation
........................................................................\
..........3-13
Fuel Filler Door
........................................................................\
..........................5-69
Fuel gauge
........................................................................\
.....................................4-4
Fuel requirements
........................................................................\
..........................1-5
Fuel additives
........................................................................\
...........................1-6
Fuses
........................................................................\
...........................................8-38
Instrument panel fuse replacement .................................................................. 8-39
Engine compartment panel fuse replacement
................................................8-40
Fuse/relay panel description
........................................................................\
...8-41

I
I-11
LCD display (Type C) ........................................................................\
................4-39
LCD display control
........................................................................\
...............4-39
View modes
........................................................................\
............................4-40
Utility view mode
........................................................................\
...................4-41
Option menu
........................................................................\
...........................4-43
User settings mode
........................................................................\
.................4-44
LCD display messages
........................................................................\
................4-19
Shift to P to start engine
........................................................................\
..........4-19
Shift to P
........................................................................\
.................................4-19
Low key battery ........................................................................\
....................... 4-19
Press brake pedal to start engine
....................................................................4-19
Key not in vehicle
........................................................................\
..................4-19
Key not detected
........................................................................\
.....................4-19
Press START button again
........................................................................\
.....4-19
12V bettery discharging due to additional electrical devices
..........................4-19
Press START button with key
........................................................................\
4-20
Check BRAKE SWITCH fuse
.......................................................................4-20
Door, Hood, Trunk open indicator
.................................................................4-20
Sunroof open indicator
........................................................................\
...........4-20
Press START button while turning wheel
.......................................................4-20
Check steering wheel lock system
..................................................................4-20
Lights mode
........................................................................\
............................4-21
Wiper mode
........................................................................\
............................4-21
Low pressure
........................................................................\
..........................4-21
Low washer fluid ........................................................................\
..................... 4-21
Low fuel
........................................................................\
..................................4-21
Engine has overheated ........................................................................\
............. 4-21
Check exhaust system
........................................................................\
.............4-22
Check headlight
........................................................................\
.......................4-22
Check turn signal ........................................................................\
..................... 4-22
Check brake light
........................................................................\
....................4-22
Check headlamp LED
........................................................................\
.............4-22
Check Active Air Flap system
........................................................................\
.4-22

Index
I-18
U
USB charger
........................................................................\
..............................5-121
V
Vanity mirror lamp
........................................................................\
......................5-80
Vehicle break-in process
........................................................................\
...............1-7
Vehicle certification label
........................................................................\
...........2-13
Vehicle identification number (VIN)
..................................................................2-13
Vehicle load limit
........................................................................\
......................6-139
Tire loading information label
......................................................................6-139
Vehicle modification
........................................................................\
.....................1-7
Vehicle Stability Management (VSM) ................................................................. 6-31
Vehicle weight and luggage volume
...................................................................2-10
Virtual Engine Sound System (VESS)
................................................................1-14
W
Warning and indicator lights
........................................................................\
.......4-10
Air bag warning light
........................................................................\
.............4-10
Seat belt warning light
........................................................................\
...........4-10
Parking brake & brake fluid warning light
....................................................4-10
Anti-lock Brake System (ABS) warning light
...............................................4-11
Electronic brake force distribution (EBD) system warning light
...................4-11
Electric Power Steering (EPS) warning light
.................................................4-12
AUTO HOLD indicator light
........................................................................\
.4-12
Malfunction Indicator lamp (MIL) .................................................................. 4-13
Charging system warning light
......................................................................4-13
Engine oil pressure warning light
..................................................................4-13
Low fuel level warning light
........................................................................\
..4-14
Master warning light
........................................................................\
..............4-15
Low tire pressure warning light
.....................................................................4-15
Electronic stability control (ESC) indicator light ............................................4-15
Electronic stability control (ESC) OFF indicator light
..................................4-16
Immobilizer indicator light
........................................................................\
....4-16
Turn signal indicator light
........................................................................\
......4-17
Headlamp warning light
........................................................................\
.........4-17
High beam indicator light ........................................................................\
........ 4-18
High Beam Assist (HBA) indicator light
.......................................................4-18

I
I-19
Light ON indicator light ........................................................................\
.........4-18
Forward Collision-Avoidance Assist warning light
.......................................4-18
Lane Keeping Assist indicator light
...............................................................4-18
Regenerative brake warning light
..........................................................1-16, 4-11
Service warning light
........................................................................\
.....1-16, 4-14
Exhaust system (GPF) warning light
..............................................................4-14
Ready indicator
........................................................................\
..............1-16, 4-17
EV mode indicator
........................................................................\
.........1-16, 4-17
Washer fluid
........................................................................\
................................8-21
Welcome system
........................................................................\
.........................5-81
Welcome light
........................................................................\
........................5-81
Interior lamp
........................................................................\
...........................5-81
Wheel alignment and tire balance ........................................................................\
8-28
Wheel replacement
........................................................................\
......................8-28
Windows
........................................................................\
......................................5-51
Power windows
........................................................................\
......................5-52
Auto up/down window
........................................................................\
...........5-52
Automatic reverse
........................................................................\
..................5-53
Power window lock switch
........................................................................\
....5-54
Windshield defrosting and defogging
...............................................................5-113
Windshield washers
........................................................................\
....................5-83
Windshield wipers
........................................................................\
......................5-82
Winter driving
........................................................................\
...........................6-135
Snow tires
........................................................................\
.............................6-135
Tire chains
........................................................................\
............................6-136
Winter Precautions
........................................................................\
....................6-137
Wiper blades replacement
........................................................................\
...........8-24
Wipers and washers
........................................................................\
....................5-82
Windshield wipers
........................................................................\
..................5-82
Windshield washers
........................................................................\
................5-83
Wireless cellular phone charging system
..........................................................5-122