2018 Hyundai Sonata Plug-in Hybrid key battery

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Convenient features of your vehicle
3
Panic button
Press the Panic button (4) and hold
for more than one second. The horn
sounds and hazard warning lights
blink for about 30 seconds. To cancel
the panic mode, press any button on
the Smart Key.
Start-up
You can start the engine without
inserting the key.
For more information, refer to the
"Engine Start/Stop Button" sec-
tion in chapter 5.
To prevent damaging the smart key:
• Keep the smart key in a cool, dryplace to avoid damage or mal-
function. Exposure to moisture
or high temperature may cause
the internal circuit of the smart
key to malfunction which may
not be covered under warranty.
Avoid dropping or throwing the smart key.
Protect the smart key from extreme temperatures. Always have the smart key with
you when leaving the vehicle. If
the smart key is left near the vehi-
cle, the vehicle battery may be dis-
charged.
Mechanical key
If the Smart Key does not operate
normally, you can lock or unlock the
door by using the mechanical key.
To remove the mechanical key from
the smart key fob, press and hold the
release button (1) and pull the
mechanical key (2) out.
To unlock the vehicle using the
mechanical key, insert the mechani-
cal key into the key hole on the driv-
er door.
To reinstall the mechanical key, put
the key into the hole and push it until
a click sound is heard.
NOTICE
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Convenient features of your vehicle
3
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 harmfulinterference.
2. This device must accept any inter- ference received, including interfer-
ence 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.
Battery replacement
If the Smart Key is not working prop-
erly, try replacing the battery with a
new one.
Battery Type: CR2032
To replace the battery:
1. Pry open the rear cover of the smart key.
2. Remove the old battery and insert the new battery.
3. Reinstall the rear cover of the smart key. If you suspect your smart key might
have sustained some damage, or
you feel your smart key is not work-
ing correctly, contact an authorized
HYUNDAI dealer.
Information
An inappropriately disposed
battery can be harmful to the
environment and human
health. Dispose the battery
according to your local law(s)
and regulation(s).
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3-50
Convenient features of your vehicle
Inside the vehicle
When you can not unlock the trunk
due to battery discharge or other
reasons, you can unlock the trunk
inside the vehicle.
Open the cable cover(1) under the
rear seat with a mechanical key and
pull the cable (2) for unlocking the
trunk.
Smart Trunk (if equipped)
On a vehicle equipped with a smart
key, the trunk can be opened with
hands-free activation using the Smart
Trunk system.
How to use the Smart Trunk
The trunk can be opened with no-
touch activation satisfying all the
conditions below.
After 15 seconds when all doorsare closed and locked
Positioned in the detecting area for more than 3 seconds.
Information
The Smart trunk will NOT operate
when:
- Any door is open, or all doors areclosed but not locked
- The smart key is detected within 15 seconds from when the doors were
closed and locked
- For vehicles equipped with illumi- nated exterior front door handles, if
the smart key is detected within 15
seconds from when the doors were
closed and locked or if the smart key
is within 60 inches (1.5m) from the
front door handles.
- The smart key is in the vehicle.
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Convenient features of your vehicle
Electric PowerSteering (EPS)Warning Light
This warning light illuminates:
When the Engine Start/Stop button
is in the ON position.
- It illuminates for approximately 3seconds and then goes off.
When there is a malfunction with the EPS.
In this case, have the vehicle
inspected by an authorized
HYUNDAI dealer.
Immobilizer Indicator
This indicator illuminates up to 30
seconds:
When the vehicle detects thesmart key in the vehicle with the
Engine Start/Stop button in the
ACC or ON position.
- You can start the vehicle.
- The indicator light goes off afterstarting the vehicle.
This indicator blinks for a few sec-
onds:
When the smart key is not in the vehicle.
- You cannot start the vehicle.
This indicator illuminates for 2 sec-
onds and goes off:
When the Smart Key is not detect-ed inside the vehicle, when the
Engine Start/Stop button is in the
ON position.
In this case, have the vehicle
inspected by an authorized
HYUNDAI dealer.
This indicator blinks:
When the Smart Key battery isweak.
- In this case, you cannot start theengine. However, by pressing the
Engine Start/Stop button with the
smart key, you may start the
engine. (For more information,
refer to "Starting the Vehicle"
in the chapter 5).
When there is a malfunction with the immobilizer system.
In this case, have the vehicle
inspected by an authorized
HYUNDAI dealer.

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Convenient features of your vehicle
3
Lane Keeping AssistSystem (LKAS)Indicator Light(if equipped)
This indicator light illuminates:
[Green] When the system operat-
ing conditions are satisfied.
[White] The system operating con- ditions are not satisfied.
[Yellow] When there is a malfunc- tion with the lane keeping assist
system.
In this case, have your vehicle
inspected by an authorized
HYUNDAI dealer.
For more details, refer to "Lane
Keeping Assist System (LKAS)" in
chapter 5.
Warning messages
Shift to P
This warning message is displayed
when you attempt to turn OFF the
vehicle without setting the shift lever
in P (Park).
At this time, the Engine Start/Stop
button turns to the ACC position
(When you re-press the Engine
Start/Stop button again, it will turn to
the ON position).
Low key battery
This warning message is displayed
when the Smart Key battery is dis-
charged while turning the Engine
Start/Stop button to the OFF position.
Press brake pedal to start engine
This warning message is displayed
when the Engine Start/Stop button
changes to the ACC position twice
by repeatedly pressing the button
without depressing the brake pedal.
You can start the vehicle by depress-
ing the brake pedal
Key not in vehicle
This warning message is displayed
when the Smart Key is not in the
vehicle while pressing the Engine
Start/Stop button.
When attempting to start the vehicle,
always have the smart key with you.
Key not detected
This warning message is displayed
when the Smart Key is not detected
while pressing the Engine Start/Stop
button.

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Convenient features of your vehicle
Battery saver function
The purpose of this feature is to pre-
vent the battery from being dis-
charged. The system automatically
turns off the parking lamp when the
driver turns the engine off and opens
the driver-side door.
With this feature, the parking lamps
will turn off automatically if the driver
parks on the side of road at night.
If necessary, to keep the lamps on
when the engine is turned off, perform
the following:
1) Open the driver-side door.
2) Turn the parking lamps OFF andON again using the light switch on
the steering column.
Headlamp delay function (if equipped)
If engine Start/Stop button is in the
ACC or OFF position with the head-
lamps ON, the headlamps (and/or
parking lamps) remain on for about 5
minutes. However, if the driver’s door
is opened and closed, the headlamps
are turned off after 15 seconds.
However, with the engine off if the dri-
ver’s door is opened and closed, the
headlamps (and/or parking lamps)
are turned off after 15 seconds.
The headlamps (and/or parking
lamps) can be turned off by pressing
the lock button on the smart key
twice or turning the light switch to the
OFF or AUTO position. However, if
you turn the light switch to the AUTO
position when it is dark outside, the
headlamps will not be turned off.
You can activate or deactivate the
Headlamp Delay function from the
User Settings Mode (Light) on the
LCD display.
For more information, refer to the
"LCD Display" section in this
chapter. If the driver gets out of the vehicle
through other doors (except dri-
ver’s door), the battery saver func-
tion does not operate and the
headlamp delay function does not
turn off automatically. Therefore, It
causes the battery to be dis-
charged. In this case, make sure
to turn off the lamp before getting
out of the vehicle.
NOTICE

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Convenient features of your vehicle
3
Interior Lights
Do not use the interior lights for
extended periods when the engine
is turned off or the battery will dis-
charge.
Interior lamp AUTO cut
The interior lamps will automatically
go off approximately 20 minutes after
the engine is turned off and the
doors closed. If a door is opened, the
lamp will go off 40 minutes after the
engine is turned off. If the doors are
locked by the smart key and the vehi-
cle enters the armed stage of the
theft alarm system, the lamps will go
off five seconds later.
Front lamps
(1) Front Map Lamp
(2) Front Room Lamp
(3) Front Door Lamp
NOTICE
Do not use the interior lights
when driving in the dark. The inte-
rior lights may obscure your view
and cause an accident.
WARNING
OTL047079L
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■Type A
■Type B

5-11
Driving your vehicle
5
Information
If the smart key battery is weak or the
smart key does not work correctly,
you can start the hybrid system by
pressing the Engine Start/Stop button
with the smart key in the direction of
the picture above.
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