2020 Hyundai Sonata Pressure sensor

06
6-33
The Idle Stop and Go (ISG) system
automatically and temporarily shuts
down the engine when the vehicle
is stopped and idling to improve fuel
efficiency and reduce exhaust gas
emissions. (i.e. red stop light, stop sign,
and traffic jam).
The engine is automatically started upon
satisfying the starting conditions.
The ISG system is always active, when
the engine is running.
Information
When the engine is automatically started
by the ISG system, some warning
lights (i.e. ABS, ESC, ESC OFF, EPS,
and parking brake warning light) may
illuminate for a few seconds due to the
low battery voltage. However, it does
not indicate a malfunction with the ISG
system.
To Activate the ISG System
Prerequisite for activation
The ISG system operates in the following
situations.
• The driver's seatbelt is fastened
• The driver's door and hood are closed
• The brake vacuum pressure is adequate
• The battery sensor is activated and the battery is sufficiently charged
• Outside temperature is not too low or too high
• The vehicle is driven over a constant speed and stops
• The climate control system satisfies the conditions
• The vehicle is sufficiently warmed up
• The incline is gradual
• The steering wheel is turned less than 180 degrees and then the vehicle
stops
Information
• The ISG system is not
activated, when the
prerequisites to activate
the ISG system are
unsatisfied. In this case,
the ISG OFF button indicator
illuminates, and the auto stop indicator
(
) illuminates in yellow on the
instrument cluster.
• When the above indicator remains
illuminated on the instrument cluster,
have the IGS system checked by an
authorized HYUNDAI dealer.
Auto stop
To stop the engine in idle stop mode
1. Decrease the vehicle speed to 0 mph.
2. Depress the brake pedal with the shift
button in D (Drive) or N (Neutral).
The auto stop indicator (
) illuminates
in green on the instrument cluster, when
the engine stops.
Information
The driving speed must reach at least 3
mph (5 km/h) after an idle stop to stop the
engine in idle stop mode again.
In auto stop mode, when the driver
opens the hood, the ISG system will be
deactivated.
ISG (IDLE STOP AND GO) SYSTEM (IF EQUIPPED)

While Driving6-36
Battery Sensor Deactivation
ODN8A069204ODN8A069204
[A] : Battery sensor
The battery sensor is deactivated, when
the battery is disconnected from the
negative pole for maintenance purpose.
In this case, the ISG system is limitedly
operated due to the battery sensor
deactivation. Thus, the driver needs
to take the following procedures to
reactivate the battery sensor after
disconnecting the battery.
Prerequisites to reactivate the
battery sensor
Switch "ON" and "OFF" the ignition one
time. Park the vehicle for a minimum of 4
hours with the hood and all doors closed.
Pay extreme caution not to connect any
accessories (i.e. navigation and black
box) to the vehicle with the engine in the
OFF status. If not, the battery sensor may
not be reactivated.
Information
The ISG system may not operate in the
following situations. - There is a malfunction with the ISG
system.
- The battery is weak.
- The brake vacuum pressure is low.
If this occurs, have the ISG system
checked by an authorized HYUNDAI
dealer.
NOTICE
• Use only a genuine HYUNDAI
Absorbent Glass Mat (AGM) battery
for replacement. If not, the ISG
system may not operate normally.
• Do not recharge the Absorbent Glass
Mat (AGM) battery with a general
battery charger. It may damage or
explode the Absorbent Glass Mat
(AGM) battery.
• Do not remove the battery cap. The
battery electrolyte, which is harmful
to the human body, may leak out.

06
6-75
Type AType AType BType B
OTM058087LOTM058087LODN8059289LODN8059289L
Check Blind-Spot Collision-Avoidance
Assist (BCA) system
If there is a problem with BCA system,
a w
arning message will appear. The
system will turn off automatically. BCW
will still operate even if BCA system turns
off due to malfunction. Have the vehicle
inspected by an authorized HYUNDAI
dealer.
Limitations of the System
The driver must be cautious in the below
situations, because the system may not
detect other vehicles or objects in certain
circumstances.
• The system may not work around 15 seconds after starting the vehicle or
the initialization or rebooting of the
front view camera.
• When a trailer or carrier is installed.
• The vehicle drives in inclement weather such as heavy rain or snow.
• The sensors are polluted with rain, snow, mud, etc.
• The rear bumper where the sensors are located is covered with a foreign
object such as a bumper sticker, a
bumper guard, a bike rack, etc.
• The rear bumper is damaged, or the sensor is out of the original default
position.
• The vehicle height gets lower or higher due to heavy loading in a trunk,
abnormal tire pressure, etc.
• When the temperature of the rear bumper is high.
• When the sensors are blocked by other vehicles, walls or parking-lot
pillars.
• The vehicle drives on a curved road.
• The vehicle drives through a tollgate.
• The road pavement (or the peripheral ground) abnormally contains metallic
components (i.e. possibly due to
subway construction).
• There is a fixed object near the vehicle, such as a guardrail.

While Driving6-76
• While going down or up a steep road where the height of the lane is
different.
• Driving on a narrow road where trees or grass or overgrown.
• Driving in rural areas where the sensor does not detect another vehicle or
structure for an extended period of
time.
• Driving on a wet road.
• Driving on a road where the guardrail or wall is in double structure.
• A big vehicle is near such as a bus or truck.
• When the other vehicle approaches very close.
• When the other vehicle passes at a very fast speed.
• While changing lanes.
• If the vehicle has started at the same time as the vehicle next to you and
has accelerated.
• When the vehicle in the next lane moves two lanes away from you OR
when the vehicle two lanes away
moves to the next lane from you.
• A motorcycle or bicycle is near.
• A flat trailer is near.
• If there are small objects in the detecting area such as a shopping
cart or a baby stroller. • If there is a low height vehicle such as
a sports car.
• The brake pedal is depressed.
• ESC (Electronic Stability Control) is activated.
• ESC (Electronic Stability Control) malfunctions.
• The tire pressure is low or a tire is damaged.
• The brake is reworked.
• The vehicle abruptly changes driving direction.
• The vehicle makes sharp lane changes.
• The vehicle sharply stops.
• Temperature is extremely low around the vehicle.
• The vehicle severely vibrates while driving over a bumpy road, uneven/
bumpy road, or concrete patch.
• The vehicle drives on a slippery surface due to snow, water puddle,
or ice.
• Lane Keeping Assist does not operate normally. (if equipped)
• For more information, refer to “Lane Keeping Assist (LKA)” in this chapter.

06
6-83
Information
The system may suggest a break according
to the driver’s driving pattern or habits
even if the driver doesn’t feel fatigue.
NOTICE
• Driver Attention Warning system
utilizes the camera sensor on the
front windshield for its operation. To
keep the camera sensor in the best
condition, you should observe the
followings:
• Never install any accessories or
stickers on the front windshield, or
tint the front windshield.
• NEVER place any reflective objects
(i.e. white paper, mirror) over the
dashboard. Any light reflection
may cause a malfunction of Driver
Attention Warning system.
• Pay extreme caution to keep the
camera sensor dry.
• Never disassemble the camera
assembly, or apply any impact on the
camera assembly.
If the sensor is forcibly moved out
of proper alignment, the system
may not operate correctly. Have the
vehicle inspected by an authorized
HYUNDAI dealer.
CAUTION
• Driver Attention Warning system may
not provide alerts in the following
situations:
• Driver Attention Warning system
is using the front view camera. To
optimize the function of the front
view camera, the driver should
manage carefully. For detailed
information, please refer to the
warning statements in Lane Keeping
Assist system section.
• The lane detection performance
is limited. (For more information,
refer to “Lane Keeping Assist (LKA)”
section in this chapter.)
• The vehicle is erratically driven
or is abruptly turned for obstacle
avoidance (e.g. construction area,
other vehicles, fallen objects, bumpy
road).
• Forward drivability of the vehicle is
severely undermined (possibly due
to wide variation in tire pressures,
uneven tire wear-out, toe-in/toe-out
alignment).
• The vehicle is driven on a curvy road.
• The vehicle is driven through a windy
area.
• The vehicle is driven on a bumpy
road.
• The vehicle is controlled by the
following driving assist systems:
- Forward Collision-Avoidance Assist
system
- Lane Keeping Assist system
- Smart Cruise Control system
- Lane Following Assist system
CAUTION
Playing the vehicle audio system at
high volume may prevent occupants
from hearing Driver Attention Warning
system warning sounds.

06
6-129
• The vehicle height gets lower or higher due to heavy loading in a trunk,
abnormal tire pressure, etc.
• When the temperature of the rear bumper is high.
• When the sensors are blocked by other vehicles, walls or parking-lot
pillars.
• The vehicle drives on a curved road.
• The road pavement (or the peripheral ground) abnormally contains metallic
components (i.e. possibly due to
subway construction).
• There is a fixed object near the vehicle, such as a guardrail.
• While going down or up a steep road where the height of the lane is
different.
• Driving on a narrow road where trees or grass or overgrown.
• Driving in rural areas where the sensor does not detect another vehicle for an
extended period of time.
• Driving on a wet road.
• Driving on a road where the guardrail or wall is in double structure.
• A big vehicle is near such as a bus or truck.
• When the other vehicle approaches very close.
• When the other vehicle passes at a very fast speed.
• While changing lanes. • If the vehicle has started at the same
time as the vehicle next to you and
has accelerated.
• When the vehicle in the next lane moves two lanes away from you or
when the vehicle two lanes away
moves to the next lane from you.
• A motorcycle or bicycle is near.
• A flat trailer is near.
• If there are small objects in the detecting area such as a shopping
cart or a baby stroller.
• If there is a low height vehicle such as a sports car.
• The brake pedal is depressed.
• ESC (Electronic Stability Control) is activated.
• ESC (Electronic Stability Control) malfunctions.
• The tire pressure is low or a tire is damaged.
• The brake is reworked.
• The vehicle sharply stops.
• Temperature is extremely low around the vehicle.
• The vehicle severely vibrates while driving over a bumpy road, uneven/
bumpy road, or concrete patch.
• The vehicle drives on a slippery surface due to snow, water puddle,
or ice.
• If the vehicle moves backward after the vehicle is parked with a diagonal
line

07
7-9
Low Tire Pressure Telltale
Low Tire Pressure LCD Display
with Position Indicator
ODN8049019LODN8049019L
When the tire pressure monitoring
system warning indicators are
illuminated and the warning message
is displayed on the cluster LCD
display, one or more of your tires is
significantly under-inflated. The LCD
position indicator will indicate which
tire is significantly under-inflated by
illuminating the corresponding position
light.
If any of your tire pressures are indicated
as being low, immediately reduce
your speed, avoid hard cornering, and
anticipate increased stopping distances.
You should stop and check your tires
as soon as possible. Inflate the tires to
the proper pressure as indicated on the
vehicle’s placard or tire inflation pressure
label located on the driver’s side center
pillar outer panel.
If you cannot reach a service station or
if the tire cannot hold the newly added
air, replace the low pressure tire with the
spare tire. (if equipped)
The Low Tire Pressure LCD position
indicator will remain on and the TPMS
Malfunction Indicator may blink for one
minute and then remain illuminated until
you have the low pressure tire repaired
and replaced on the vehicle.
NOTICE
The spare tire is not equipped with a
tire pressure sensor.
CAUTION
In winter or cold weather, the Low Tire
Pressure Telltale may be illuminated if
the tire pressure was adjusted to the
recommended tire inflation pressure
in warm weather. It does not mean
your TPMS is malfunctioning because
the decreased temperature leads to a
proportional lowering of tire pressure.
When you drive your vehicle from a
warm area to a cold area or from a cold
area to a warm area, or the outside
temperature is greatly higher or lower,
you should check the tire inflation
pressure and adjust the tires to the
recommended tire inflation pressure.
WARNING
Low pressure damage
Significantly low tire pressure makes
the vehicle unstable and can contribute
to loss of vehicle control and increased
braking distances.
Continued driving on low pressure tires
can cause the tires to overheat and fail.

Emergency Situations7-10
TPMS Malfunction
Indicator
The TPMS Malfunction Indicator
will illuminate after it blinks for
approximately one minute when there
is a problem with the Tire Pressure
Monitoring System.
Have the system checked by an
authorized HYUNDAI dealer as soon as
possible.
NOTICE
If there is a malfunction with the
TPMS, the individual tire pressures
in the cluster LCD display will not be
available. Have the system checked by
an authorized HYUNDAI dealer as soon
as possible.
NOTICE
The TPMS Malfunction Indicator may
illuminate after blinking for one minute
if the vehicle is near electric power
supply cables or radio transmitters
such as police stations, government
and public offices, broadcasting
stations, military installations, airports,
transmitting towers, etc.
Additionally, the TPMS Malfunction
Indicator may illuminate if snow chains
are used or electronic devices such as
computers, chargers, remote starters,
navigation, etc. This may interfere with
normal operation of the TPMS.
Changing a Tire with TPMS
If you have a flat tire, the Low Tire
Pressure and LCD position indicator will
come on. Have the flat tire repaired by an
authorized HYUNDAI dealer as soon as
possible or replace the flat tire with the
spare tire. (if equipped)
CAUTION
It is recommended that you do not use a
puncture-repairing agent not approved
by HYUNDAI dealer to repair and/or
inflate a low pressure tire. Tire sealant
not approved by HYUNDAI dealer may
damage the tire pressure sensor.
The spare tire does not come with a
tire pressure monitoring sensor. When
the low pressure tire or the flat tire is
replaced with the spare tire, the Low
Tire Pressure LCD position indicator will
remain on. Also, the TPMS Malfunction
Indicator will illuminate after blinking
for one minute if the vehicle is driven
at speed above 15.5 mph (25 km/h) for
approximately 20 minutes.
Once the original tire equipped with
a tire pressure monitoring sensor is
reinflated to the recommended pressure
and reinstalled on the vehicle, the Low
Tire Pressure LCD position indicator and
TPMS Malfunction Indicator will go off
within a few minutes of driving.
If the indicators do not disappear after a
few minutes, please visit an authorized
HYUNDAI dealer.