2021 HYUNDAI NEXO Fuel system

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Your vehicle at a glance
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1. Inside door handle ................................3-14
2. Side view mirror folding switch ..............3-32
3. Side view mirror control switch ..............3-31
4. Central door lock switch ........................3-15
5. Power window lock switch......................3-36
6. Power window switches ........................3-33
7. Instrument panel illumination
control switch ........................................3-59
8. ESC OFF button ....................................5-31
9. Fuel filler door opener button ................3-55
10. Lane Keeping Assist (LKA) system ....5-79
11. Blind-spot Collision-avoidance
Assist (BCA) system ............................5-53
12. Power liftgate button ............................3-45
13. 12V battery reset button ........................6-5
14. Steering wheel tilt/telescope lever ......3-21
15. Steering wheel ....................................3-20
16. Seat........................................................2-4
17. Hood release lever ..............................3-42
18. Power outlet, USB charger ....3-166, 3-169
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The actual shape may differ from the illustration.

Convenient features of your vehicle
Accessing Your Vehicle .........................................3-3
Smart Key ............................................................................3-3
Immobilizer System ...........................................................3-9
Door Locks ............................................................3-11
Door unlocking from outside the vehicle .................3-11
Door locking from outside the vehicle ......................3-14
Operating Door Locks from Inside the Vehicle .......3-14
Automatic Door Lock and Unlock Features .............3-17
Child-Protector Rear Door Locks ...............................3-18
Theft-Alarm System ............................................3-19
Steering Wheel .....................................................3-20
Electric Power Steering (EPS) .....................................3-20
Tilt Steering/Telescope Steering.................................3-21
Horn ....................................................................................3-22
Heated Steering Wheel ..................................................3-22
Mirrors ...................................................................3-23
Inside Rearview Mirror ..................................................3-23
Side View Mirrors ...........................................................3-31
Windows ................................................................3-33
Power Windows ...............................................................3-34
Sunroof..................................................................3-37
Sunroof Opening and Closing ......................................3-38
Sliding the Sunroof .........................................................3-38
Tilting the Sunroof .........................................................3-39
Sunshade ...........................................................................3-39Resetting the Sunroof ...................................................3-40
Sunroof Open Warning ..................................................3-41
Exterior Features .................................................3-42
Hood ...................................................................................3-42
Non-Powered Liftgate ...................................................3-43
Power Liftgate .................................................................3-45
Smart Liftgate ..................................................................3-51
Fuel Filler Door ................................................................3-55
Emergency Fuel Filler Door Release..........................3-57
Instrument Cluster ...............................................3-58
Instrument Cluster Control............................................3-59
Gauges and Meters ........................................................3-59
Warning and Indicator Lights .......................................3-65
LCD Display Messages ...................................................3-76
LCD Display ...........................................................3-81
LCD Display Control ........................................................3-81
LCD Display Modes .........................................................3-82
Trip Computer .......................................................3-85
Lighting..................................................................3-89
Exterior Lights .................................................................3-89
Welcome System .............................................................3-99
Wipers and Washers..........................................3-101
Front Windshield Wipers .............................................3-101
Front Windshield Washers ..........................................3-103
Rear Window Wiper and Washer..............................3-104
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3-55
Convenient features of your vehicle
3
Fuel Filler Door
Opening the fuel filler door
1. Turn the vehicle off.
2. Push the fuel filler door opener
button.
The fuel filler door does not
open if the vehicle is not off.
The fuel filler door may open after
several seconds from turning off
the vehicle. However, in cold
weather, the fuel door may not
open for about 45 seconds until
the cluster message "Powering
down..." disappears. This is for
protecting the fuel cell system.3. Pull the fuel filler door (1) outward
to access the fuel filler cap.
4. Pull the fuel filler cap (2).
Information
If the fuel filler door does not open
because ice has formed around it, tap
lightly or push on the door to break
the ice and release the door. Do not
pry on the door. If necessary, spray
around the door with an approved de-
icer fluid (do not use radiator anti-
freeze) or move the vehicle to a warm
place and allow the ice to melt.
Closing the fuel filler door
1. Cover the fuel filler with the cap.
2. Close the fuel filler door until it is
latched securely.
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NOTICE
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If the fuel filler cap requires
replacement, you should use
parts for replacement from an
authorized Hyundai dealer. An
incorrect fuel filler cap can
result in a serious malfunc-
tion of the fuel system or
emission control system. you
should contact your HYUNDAI
dealer for replacement.
If the fuel filler door is not
completely closed, the vehicle
is not turned on. Close the
fuel filler door and turn on the
vehicle.
WARNING

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Convenient features of your vehicle
Warning and Indicator lights
Information
Make sure that all warning lights are
OFF after starting the vehicle. If any
light is still ON, this indicates a situa-
tion that needs attention.
Ready Indicator
This indicator illuminates :
When the vehicle is ready to be driven.
- ON : Normal driving is possible.
- OFF : Normal driving is not possible,
or a problem has occurred.
- Blinking : Emergency driving.
When the ready indicator goes OFF
or blinks, there is a problem with the
system. In this case, have your vehi-
cle inspected by an authorized
HYUNDAI dealer.
Service Warning Light
This warning light illuminates :
When the POWER button is in the
ON position.
- It illuminates for approximately 3
seconds and then goes off.
When there is a problem with relat-
ed parts of the fuel cell electric
vehicle control system, such as
sensors, etc.
When the warning light illuminates
while driving, or does not go OFF
after starting the vehicle, have your
vehicle inspected by an authorized
HYUNDAI dealer.
Power Down Warning
Light
This warning light illuminates :
When the vehicle power should be
limited due to a malfunction with
fuel cell stack.
If the warning light continuously
remains on when the vehicle is in
"READY" state, or comes on dur-
ing driving, this indicates that there
may be a malfunction with the fuel
cell stack. If this occurs, we recom-
mend that you have the vehicle
inspected by an authorized
HYUNDAI dealer.
If the warning light turns on again
when restarting the vehicle after
parking your vehicle on an incline.
NOTICE
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3-66
Icy Road Warning Light
(if equipped)
This warning light is to warn the driver
the road may be icy.
When the temperature on the out-
side temperature gauge is approxi-
mately below 40°F (4°C), the Icy
Road Warning Light and Outside
Temperature Gauge blinks and then
illuminates. Also, the warning chime
sounds 1 time.
The Icy Road Warning function can
be activated or deactivated from the
Vehicle Settings mode in the AVN
screen.
Information
If the icy road warning light appears
while driving, you should drive more
attentively and safely, refraining from
over-speeding, rapid acceleration, sud-
den braking or sharp turning, etc.
Hydrogen Gas Leak
Warning Light
This warning light illuminates:
[Red] When the hydrogen leakage
is detected in the vehicle.
[Yellow] When there is a malfunc-
tion with the hydrogen leakage
detection sensor.
If the warning light continuously
remains on when the vehicle is in
"READY" state, or comes on during
driving, this indicates that there may
be hydrogen leakage or a malfunc-
tion with the hydrogen leakage
detection sensor. If this occurs, stop
the vehicle and have the hydrogen
system inspected by an authorized
HYUNDAI dealer.
Low Fuel Level
Warning Light
This warning light illuminates:
When the fuel tank is nearly empty.
If the fuel tank is nearly empty:
Add fuel as soon as possible.
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Convenient features of your vehicle

3-83
Convenient features of your vehicle
3
Trip computer mode
The trip computer mode displays
information related to vehicle driving
parameters including fuel economy,
tripmeter information and vehicle
speed.
For more details, refer to "Trip
Computer" in this chapter.
Turn By Turn (TBT) mode
This mode displays the state of the
navigation.
Information mode
Tire Pressure
This mode displays information relat-
ed to Tire Pressure.
For more details, refer to "Tire
Pressure Monitoring System
(TPMS)" in chapter 6.
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3-88
Convenient features of your vehicle
The driving information will continue to
be counted while the vehicle is in the
ready ( ) mode. (for example, when
the vehicle is in traffic or stopped at a
stop light).
Information
The vehicle must be driven for a mini-
mum of 0.19 miles (300 meters) since the
last ignition key cycle before the average
fuel economy will be recalculated.
Digital speedometer
This digital speedometer display
shows the speed of the vehicle.
Energy Flow
The fuel cell vehicle system informs
the drivers its energy flow in various
operating modes. While driving, the
current energy flow is specified in 3
modes.
For more details, refer to "Energy
Flow" in the fuel cell Vehicle Guide
provided in front of the owner's
manual.
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3-156
Convenient features of your vehicle
When using the air conditioning
system, monitor the temperature
gauge closely while driving up
hills or in heavy traffic when out-
side temperatures. Air condition-
ing system operation when climb-
ing a steep grade or in high out-
side ambient temperatures can
cause fuel cell stack overheating.
Continue to use the fan, but turn
the air conditioning system off if
the temperature gauge indicates
fuel cell stack overheating.
Air conditioning system operation
tips
If the vehicle has been parked in
direct sunlight during hot weather,
open the windows for a short time
to let the hot air inside the vehicle
escape.
After sufficient cooling has been
achieved, switch back from recircu-
lation mode to fresh mode. To help reduce moisture inside of
the windows on rainy or humid
days, decrease the humidity inside
the vehicle by operating the air
conditioning system with the win-
dows and sunroof closed.
Use the air conditioning system
every month only for a few minutes
to ensure maximum system per-
formance.
If you operate air conditioner exces-
sively, the difference between the
temperature of the outside air and
that of the windshield could cause
the outer surface of the windshield
to fog up, causing loss of visibility. In
this case, set the mode selection
knob or button to the position
and fan speed control to the lower
speed.
System Maintenance
Cabin air filter
[A] : Outside air, [B] : Recirculated air
[C] : Climate control 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 condition-
ing system.
Have the The cabin air filter replaced
by an authorized HYUNDAI dealer
according to the maintenance sched-
ule.
NOTICE
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