ECU HYUNDAI SONATA 2023 User Guide

Instrument Cluster
4-20
Press START button with key
(for smart key system)
This warning message is displayed if you
press the Engine Start/Stop button while
the warning message "Key not detected"
is displayed.
At this time, the immobilizer indicator
light blinks.
Check BRAKE SWITCH fuse
(for smart key system)
This warning message is displayed if the
brake switch fuse is disconnected.
You need to replace the fuse with a new
one before starting the engine.
If that is not possible, you can start the
engine by pressing the Engine Start/
Stop button for 10 seconds in the ACC position.
Door, Hood, Trunk Open Indicator
ODN8049012
This warning is displayed if any door or
the hood or the liftgate is left open. The
warning will indicate which door is open
in the display.
CAUTION
Before driving the vehicle, you should
confirm that the door/hood/liftgate
is fully closed. Also, check there is no
door/hood/liftgate open warning light
or message displayed on the instrument
cluster.
Sunroof Open (if equipped)
ODN8049013
This warning is displayed if you turn off
the engine when the sunroof is open.
Close the sunroof securely before leaving
your vehicle.

05
5-15
Information
This device complies with Industry Canada RSS-210 standard.
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.
“Limp Home” Mode and Related
Procedures
If the immobilizer warning indicator
blinks for five seconds when the ignition
key is turned to the “ON” position,
this indicates the immobilizer system
requires service. The engine cannot be
started without using the procedure
below.
The following procedure describes
how to start the engine using the limp
home function (0, 1, 2, 3 as a sample
password).
NOTICE
You can get a limp home password
when the vehicle is first delivered to
you. If you do not have a password,
consult your authorized HYUNDAI
dealer.
1. To activate the password, turn the ignition key “ON” and “OFF“
according to the digit numbers. The
immobilizer indicator will blink along
with the operation of the ignition
key. For example, turn the ignition
key once for digit number “1”, and
twice for “2”, and so on. For the digit
number “0”, you must cycle the
ignition key 10 times.
2. Wait for 3~10 seconds.
3. You may set the remaining number of digits by following steps 1 and 2.
4. If all of the four password digits have
been successfully entered, turn the
ignition key “ON” and check that the
immobilizer indicator illuminates.
From this time, you have to start your
engine within 30 seconds. If you try
to start your engine after 30 seconds,
your engine will not start.
NOTICE
If the engine stalls while driving in the
“limp home” mode, you can start your
engine within 3 seconds without re-
entering the password.
If the immobilizer indicator blinks for
five seconds, you must re-enter the
password (steps 1~4).
After performing the limp home
activation procedure, consult with your
authorized HYUNDAI dealer as soon as possible.
CAUTION
• If the password is entered incorrectly
three consecutive times, wait for
about one hour to perform the limp
home activation procedure again.
• If you cannot start your engine using
the limp home activation procedure,
have your vehicle towed by an
authorized HYUNDAI dealer.

Convenience Features
5-16
Door locks
Operating Door Locks from
Outside the Vehicle
Mechanical key
ODN8059011
If you lock the driver’s door with a
mechanical key, all vehicle doors will
lock. If you unlock the driver’s door with
a mechanical key, you can open and
close the driver’s door only.
Once the doors are unlocked, they may
be opened by pulling the door handle.
When closing the door, push the door by
hand. Make sure that doors are closed
securely.
Remote key
ODN8059279L
To lock the doors, press the Door Lock
button (1) on the remote key.
Press the Door Unlock button (2) on the
remote key, the driver’s door will unlock.
If you press the Door Unlock button
on the remote key again within four
seconds, then all the doors will unlock.
Once the doors are unlocked, they may
be opened by pulling the door handle. When closing the door, push the door by
hand. Make sure that doors are closed
securely.
Smart key
ODN8059001
Press the button on the driver’s outside
door handle while carrying the Smart Key
with you or press the Door Unlock button
on the Smart Key, the driver’s door will unlock.
If you press the button on the front
passenger’s outside door, all doors will unlock.
Once the doors are unlocked, they may
be opened by pulling the door handle.
When closing the door, push the door by
hand. Make sure that doors are closed
securely.
Information
• In cold and wet climates, door lock
and door mechanisms may not work
properly due to freezing conditions.
• If the door is locked/unlocked multiple
times in rapid succession with either
the vehicle key or door lock switch, the system may stop operating temporarily
in order to protect the circuit and
prevent damage to system components.
• Two press unlock setting can be
changed in the User Settings mode on
the cluster.

05
5-17
In case of an emergency
ODN8059291
If the electrical power door lock switch
is not operating (ex. dead car battery)
the only way to lock the door(s) is
with the mechanical key from the out -
side key hole.
Doors without an outside key hole can be locked as follows:
1. Open the door.
2. Insert the key into the emergency door lock hole and turn the key horizontally to lock.
3. Close the door securely.
i Information
If the electrical power to door lock
switch is not operating (ex. dead car
battery) and the trunk is closed, you
will not be able to open the trunk until
power is restored.
Operating Door Locks from
Inside the Vehicle
With the door handle
ODN8059012
Front door
If the inner door handle is pulled when
the door is locked, the door will unlock and open.
Rear door
If the inner door handle is pulled once
when the door is locked, the door will unlock.If the inner door handle is pulled
once more, the door will open.

05
5-19
WARNING
• The doors should always be fully
closed and locked while the
vehicle is in motion. If the doors
are unlocked, the risk of being
thrown from the vehicle in a crash is
increased.
• Do not pull the inner door handle of
the driver’s or passenger’s door while
the vehicle is moving.
WARNING
Do not leave children or animals
unattended in your vehicle. An enclosed
vehicle can become extremely hot,
causing death or serious injury to
unattended children or animals who
cannot escape the vehicle.
Children might operate features of the
vehicle that could injure them, or they
could encounter other harm, possibly
from someone gaining entry to the
vehicle.
WARNING
Always secure your vehicle.
Leaving your vehicle unlocked increases
the potential risk to you or others from
someone hiding in your vehicle.
To secure your vehicle, while depressing
the brake, move the shift button to the
P (Park) position, engage the parking
brake, and place the ignition switch
in the LOCK/OFF position, close all
windows, lock all doors, and always
take the key with you.
CAUTION
Opening a door when something is
approaching may cause damage or
injury. Be careful when opening doors
and watch for vehicles, motorcycles,
bicycles or pedestrians approaching the
vehicle in the path of the door.
WARNING
If you stay in the vehicle for a long time
while the weather is very hot or cold,
there are risks of injuries or danger to
life. Do not lock the vehicle from the
outside when someone is in the vehicle.
WARNING
Opening a door when something is
approaching may cause damage or
injury. Be careful when opening doors
and watch for vehicles, motorcycles,
bicycles or pedestrians approaching the
vehicle in the path of the door.

05
5-23
This system helps to protect your vehicle
and valuables. The horn will sound and
the hazard warning lights will blink
continuously if any of the following occur:
- A door is opened without using the remote key or smart key.
- The trunk is opened without using the remote key or smart key.
- The engine hood is opened.
The alarm continues for 30 seconds, then
the system resets. To turn off the alarm,
unlock the doors with the remote key or
smart key.
The Theft Alarm System automatically
sets 30 seconds after you lock the doors
and the trunk. For the system to activate,
you must lock the doors and the trunk
from outside the vehicle with the remote
key or smart key or by pressing the
button on the outside of the door handle
with the smart key in your possession.
The hazard warning lights will blink and
the chime will sound once to indicate the
system is armed.
Once the security system is set, opening
any door, the trunk, or the hood without
using the remote key or smart key will
cause the alarm to activate.
The Theft Alarm System will not set if the
hood, the trunk, or any door is not fully
closed. If the system will not set, check
the hood, the trunk, or the doors are fully closed.
Do not attempt to alter this system or
add other devices to it.
Information
• Do not lock the doors until all passengers have left the vehicle. If the
remaining passenger leaves the vehicle when the system is armed, the alarm will be activated.
• If the vehicle is not disarmed with the
remote key or smart key, open the doors by using the mechanical key and place the ignition switch in the
ON position (for remote key) or start
the engine (for smart key) by directly
pressing the ignition switch with the
smart key.
• If the system is disarmed by unlocking
the vehicle, but neither a door or the trunk is opened within 30 seconds, the
doors will relock and the system will
rearm automatically.
ThefT-AlArm SySTem

05
5-33
Automatic-Dimming Night Vision Safety™ (NVS®
) Mirror (if equipped)
The NVS® Mirror automatically reduces
glare by monitoring light levels in the
front and the rear of the vehicle. Any
object that obstructs either light sensor
will degrade the automatic dimming
control feature.
For more information regarding NVS®
mirrors and other applications, please
refer to the Gentex website:
www.gentex.com
Your mirror will automatically dim
upon detecting glare from the vehicles
traveling behind you.
The mirror defaults to the ON position
each time the vehicle is started. Integrated HomeLink ®
Wireless Control
System
The HomeLink® Wireless Control System
can replace up to three hand-held
radio-frequency (RF) transmitters with
a single built-in device. This innovative
feature will learn the radio frequency
codes of most current transmitters to
operate devices such as gate operators,
garage door openers, entry door locks,
security systems, even home lighting.
Both standard and rolling code-equipped
transmitters can be programmed by
following the outlined procedures.
Additional HomeLink® information can
be found at: www.homelink.com, www.
youtube.com/HomeLinkGentex or by
calling 1-800-355-3515.
Retain the original transmitter of the
RF device you are programming for use
in other vehicles as well as for future
HomeLink® programming. It is also
suggested that upon the sale of the
vehicle, the programmed HomeLink®
buttons be erased for security purposes.
WARNING
Before programming HomeLink® to a
garage door opener or gate operator,
make sure people and objects are out
of the way of the device to prevent
potential harm or damage. Do not
use the HomeLink® with any garage
door opener that lacks the safety
stop and reverse features required by
federal safety standards (this includes
any garage door opener model
manufactured before April 1, 1982).
A garage door that cannot detect an
object - signaling the door to stop
and reverse does not meet current
federal safety standards.Using a garage
door opener without these features
increases the risk of serious injury or
death.
Programming HomeLink ®
Please note the following:
• When programming a garage door opener, it is advised to park the
vehicle outside of the garage.
• It is recommended that a new battery be placed in the hand-held transmitter
of the device being programmed to
HomeLink® for quicker training and
accurate transmission of the radio-
frequency signal.
• Some vehicles may require the Engine Start/Stop button to be in the
ACC (or “Accessories”) position for
programming and/or operation of
HomeLink®.
• In the event that there are still programming difficulties or questions
after following the programming steps
listed below, contact HomeLink® at:
www.homelink.com, www.youtube.
com/HomeLinkGentex or by calling
1-800-355-3515.

Convenience Features
5-34
Programming
To program most devices, follow these
instructions:
ODN8A059136
1. Press and release (1), (2) or (3) button.
• If the indicator (4) is turned ON in Orange, go to Step 3) since it is a
new programming.
• If the indicator (4) is continuously turned ON or flashes in Green rapidly
several times, go to Step 2) since it is
a programmed button.
2. Press and hold the button you wish to program for approximately 15-
25 seconds until the LED flashes in
Orange for several times.
3. Hold the Garage Door Opener Original Transmitter near the HomeLink Mirror.
ODN8A059137
4. Press the Original Transmitter button until the indicator (4) is
turned continuously ON or flashes in
Green for approximately 10 seconds
and it indicates the programing is
completed.
5. However, the indicator (4) flashes in Green continuously, but if the
garage door opener does not operate,
please continue to follow the step 6
and 7 (“Rolling Code Programming”
procedures).
6. Firmly press and release the “Learn,” “Smart,” or “Program” button while
the indicator (4) flashes in Green.
Once the button is pressed, you have
approximately 30 seconds to initiate
the next step.
Information
At the garage door opener motor, (security
gate motor, etc.) locate the “Learn,”
“Smart,” or “Program” button. This
can usually be found where the hanging
antenna wire is attached to the motor-head
unit (see the device’s manual to identify
this button). The name and color of the
button may vary by manufacturer. A
ladder and/or second person may simplify the following steps.

05
5-49
Resetting the Sunroof
ODN8A059039
The sunroof may need to be reset if the
following conditions occur:
• The battery is discharged or disconnected or the sunroof fuse has
been replaced or disconnected
• The sunroof control lever is not operating correctly
To reset the sunroof, perform the
following steps:
1. Turn the engine on and close the sunroof glass and sunshade
completely.
2. Release the control lever.
3. Push and hold the sunroof control lever (1) forward (to close the
sunshade) for about 10 seconds until
the sunroof moves slightly, then
release the control lever.
4. Push and hold the sunroof control lever forward until the sunroof
operates as follows:
TILT DOWN → SLIDE OPEN → SLIDE
CLOSE
Then, release the control lever.
When this is complete, the sunroof
system is reset.
For more information, contact an
authorized HYUNDAI dealer.
Information
If you do not reset the sunroof, it may not
work properly.
Sunroof Open Warning (if equipped)
• If the driver turns off the engine when the sunroof is not fully closed,
the warning chime will sound for
approximately 3 seconds and the
sunroof open warning will appear on
the cluster LCD display.
• If the driver turns off the engine and opens the door when the sunroof is
not fully closed, the sunroof open
warning will appear on the cluster
LCD display until the door is closed or
the sunroof is fully closed.
Close the sunroof securely when leaving
your vehicle.

Convenience Features
5-50
Hood
Opening the hood
ODN8A059040
1. Park the vehicle and set the parking brake.
2. Pull the release lever to unlatch the hood. The hood should pop open
slightly.
ODN8A059041
3. Go to the front of the vehicle, raise the hood slightly, push up the secondary
latch (1) inside of the hood center
and lift the hood (2). After it has been
raised about halfway, it will raise
completely by itself. Closing the hood
1. Before closing the hood, check in and
around the engine compartment to
ensure the following:
- Any tools or other loose objects are removed from the engine room area
or hood opening area
- All glove, rags, or other combustible material is removed from the engine
compartment
- All filler caps are tightly and correctly installed
2. Lower the hood halfway (lifted approximately 30 cm (12 inches) from
the closed position) and push down
to securely lock in place. Then double
check to be sure the hood is secure.
If the hood can be raised slightly, it is
not securely locked. Open it again and
close it with more force.
WARNING
• Before closing the hood, ensure
all obstructions are removed from
around the hood opening.
• Always double check to be sure that
the hood is firmly latched before
driving away. Check there is no
hood open warning light or message
displayed on the instrument cluster.
Driving with the hood opened may
cause a total loss of visibility, which
might result in an accident.
• Do not move the vehicle with the
hood in the raised position, as vision
is obstructed, which might result in
an accident, and the hood could fall or be damaged.
exterior FeAtures