2021 HYUNDAI NEXO service

H15
Warning and indicator lights
OFE048100N
1. Power gauge
2. Speedometer
3. Fuel cell stack temperature gauge
4. Fuel gauge
5. Odometer/LCD display/Trip computer
6. Warning and indicator lights
Air bag warningCharging system warningElectronic Stability Control
(ESC) OFF indicator Forward Collision-
Avoidance Assist (FCA)
system warning
Seat belt warningLow fuel level warning Immobilizer Indicator
Parking brake &
brake fluid warningLow tire pressure warningTurn Signal IndicatorEPBElectronic Parking Brake
(EPB) warning
Regenerative brake
warningService warning High Beam IndicatorAUTO
HOLDAUTO HOLD Indicator
Anti-lock brake system
(ABS) warningPower down warning Light ON IndicatorMaster Warning
Electronic Brake force
Distribution (EBD) warning
Hydrogen gas leak
warning (Red) Ready indicatorLED Headlamp warning
Hydrogen leak sensor
warning (Yellow)Lane Keeping Assist (LKA)
system indicator
Electric Power Steering
(EPS) warningElectronic Stability Control
(ESC) indicator
Yellow
❈For more details, refer to the ‘Instrument cluster’ in Chapter 3.

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If you do not start the vehicle imme-
diately after pressing the 12V Battery
Reset switch, the power of 12V bat-
tery is automatically disconnected
after few seconds to save the 12V
battery from additional discharge. If
the 12V battery is disconnected prior
to starting the vehicle, press the 12V
Battery Reset switch again and then
immediately start the vehicle as
explained.
Repeated use of the 12V Battery
Reset switch without a sufficient ON
cycle (30 Min+) may cause over dis-
charge of the 12V battery, which will
prevent the vehicle from starting. If
the 12V battery is over discharged to
a point that the reset does not work,
try to jump-start the vehicle.Information
After starting the vehicle ( indica-
tor on), the 12V battery is being
charged whether the accelerator pedal
is depressed or not.
❈ ❈
For more details regarding the
jump start, refer to the 'Jump star-
ing' in Owner's manual Chapter 6.
Emergency while driving
If an accident occurs
1. Stop the vehicle, put the gear into
the P (Park) position, set the park-
ing brake, and turn the vehicle off
to prevent the hydrogen and cur-
rent from leaking.
The flow of hydrogen into the fuel
cell stack will be shut off to prevent
the current from being generated.
2. Evacuate to the safety place.
3. Call emergency services for help
and let them know the vehicle is a
Fuel Cell Electric Vehicle.
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H36
CategoryQuestionsAnswers
Cluster/
Warning Lamp
(9 items)
23. What shall I do if the hydrogen gas leak
warning light turns on on the cluster?
(Red)If the hydrogen gas leak warning light turns on during "READY" sta-
tus or in driving mode, this indicates a hydrogen gas leak inside the
vehicle. DO NOT lose your composure. Park your vehicle and turn
OFF the vehicle. Then, we recommend that you contact an author-
ized HYUNDAI dealer for service.
24. Can I keep driving the vehicle even if
the hydrogen gas leak warning light
turns on on the cluster?
(Red)The fuel cell stops working if hydrogen is no longer available. However,
the FCEV can run for an additional distance (About 2 miles (3 km)) in
EV mode where the vehicle runs only on battery power. Mileage in EV
mode can vary depending on the "state of charge" (SOC) of the high
voltage battery, so move your vehicle to the nearest shoulder on the
road. Then, we recommend that you contact an authorized HYUNDAI
dealer for service.
25. While driving to a service center after
the hydrogen gas leak warning light
turns on on the cluster, is it possible
that the vehicle catch fire if there is
something nearby to ignite the leaking
gas (cigarette butt, etc.)?
(Red)
As soon as the hydrogen gas leak warning light appears, the fuel
cell operation is disabled immediately to cut the supply of hydrogen.
This prevents the possibility of a fire occurring.
26. What should I do if a power down warn-
ing light turns on?If the power down warning light turns on during "READY" status or
in driving mode, power supply to the fuel cell system is cut off. If the
warning light turns on repeatedly when restarting the vehicle after
parking your car on the safe place, we recommend that you contact
an authorized HYUNDAI dealer for service.
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H37
CategoryQuestionsAnswers
Cluster/
Warning Lamp
(9 items)
27. What should I do if the service warning
light turns on?If the service warning light turns on during "READY" status or in
driving mode, it may indicate a malfunction in operation with any fuel
cell system. We recommend that you contact an authorized
HYUNDAI dealer for service.
28. What should I do if the master warning
light turns on?If the service warning light turns on when there is a malfuction in
operation in any of the vehicle systems. Please look at the LCD dis-
play for details and we recommend that you contact an authorized
HYUNDAI dealer for service if needed.
29. How much farther (roughly) can I drive
my FCEV when the fuel warning light
turns on? (Remaining mileage)You can continue driving for an additional 40~55 miles (70~90 km).
It may depend on driving mode.
30. When restarting the vehicle, the " "
indicator turns on on the cluster. What
does this mean?It means that the fuel cell system is working in good order and your
car is ready to drive.
31. Why does the vehicle’s hydrogen tank
have a life expectancy?
The hydrogen tank is frequently refueled with the high pressure
hydrogen gas and the number of times refueling the vehicle is limit-
ed to 5,000 times (or 15 years). The hydrogen storage system
counts the number of times the vehicle is refueled and turns on the
warning light when the vehicle is refueled for over 4,995 times.
Every time the vehicle is turned on the warning message "Replace
hydrogen tank. Maximum number of refill cycles exceeded" is dis-
played on the cluster. The vehicle can be driven about 1-3 million
kilometers until the vehicle is refueled 5,000 times, meaning that the
hydrogen tank is used semi-permanently under common driving
condition.

H38
CategoryQuestionsAnswers
Hydrogen
System
(7 items)
32. What happens if hydrogen in the hydro-
gen tank is completely consumed?
The fuel cell stops working if hydrogen is no longer available.
However, the FCEV can run for an additional distance (About 2
miles (3 km)) in EV mode where the vehicle runs only on battery
power. Mileage in EV mode can vary depending on the "status of
charge" (SOC) of the high voltage battery, so move your vehicle to
the nearest shoulder on the road. Then, we recommend that you
contact an authorized HYUNDAI dealer for service.
33. If the hydrogen gas tank is fully refu-
eled, how much farther can the FCEV
run?It can travel as far as 300~370 miles (500~600 km) at a constant
vehicle speed of 50 mph(80 kph). Realistically though, this travel
distance is shorter due to normal acceleration and deceleration
when driving.
34. Which mechanism allows for the hydro-
gen gas tank to be refueled, and is it
possible to refuel the tank as much as
you need? Is it possible that the tank
may not be fully refueled?
The tank is refueled by utilizing the difference in hydrogen pressure
between the refueling station and the vehicle. When refueling, the
hydrogen gas pressure of the refueling station is higher than that of
the vehicle. The act of refueling can be stopped as desired.
Normally, the gas tank is not fully refueled with hydrogen if the sta-
tion's hydrogen pressure is not sufficiently high, or if the station sys-
tem cannot communicate with the vehicle.
❈System and the vehicle communicates the temperature and pres-
sure of hydrogen gas via wireless network.
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H42
CategoryQuestionsAnswers
Fuel Cell
Stack/High
Voltage
Battery
(4 items)
39. What happens if hydrogen gas leaks
from the fuel cell stack?
(Red)If hydrogen gas leaks beyond what's tolerable from the fuel cell stack,
a hydrogen sensor installed in the system detects the leak and in
response, turns ON the hydrogen gas leak warning light in the cluster.
40. Can the fuel cell stack explode or burn
out due to overheating?The fuel cell stack passed a high temperature test and is deemed
safe, so it is unlikely to explode.
41. Which symptoms occur if the fuel cell
system malfunctions?
If the fuel cell system malfunctions, warning lights specific to the
actual problem appear on the LCD display. When this happens, the
vehicle speed may be limited, or the fuel cell system may shut
down. DO NOT lose your composure if this happens. Park your vehi-
cle and turn OFF the vehicle. Then, we recommend that you contact
an authorized HYUNDAI dealer for service.
42. Is the recharge performance of the high
voltage battery reduced depending on
its length of use? Like any vehicle component, the high voltage battery will decrease
in performance as it ages over time. However, the high voltage bat-
tery of the FCEV is durable enough to work at peak performance
beyond the warranty period.
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I-7
Lighting ...........................................................................3-89
Exterior Lights............................................................3-89
Welcome System ........................................................3-99
Luggage Net Holder .....................................................3-172
Maintenance services ........................................................7-4
Owner's Responsibility.................................................7-4
Owner Maintenance Precautions..................................7-4
Mirrors ............................................................................3-23
Inside Rearview Mirror ..............................................3-23
Side View Mirrors ......................................................3-31
Motor Number ..................................................................8-8
Multimedia system............................................................4-2
USB and iPod
®port .....................................................4-2
Antenna ........................................................................4-2
Steering wheel audio controls ......................................4-3
Bluetooth
®Wireless Technology..................................4-4
Audio/Video/Navigation system (AVN) ......................4-4
Non-Powered Liftgate.....................................................3-43Occupant Classification System (OCS)..........................2-58
Owner maintenance ..........................................................7-5
Owner maintenance schedule .......................................7-6
Paddle Shifter (Regenerative Braking Control) .............5-17
Parking Distance Warning (Reverse/Forward)
System .......................................................................3-105
Power Brakes ..................................................................5-18
Power Button ....................................................................5-6
POWER Button Positions ............................................5-7
Starting the Vehicle ......................................................5-9
Turning Off the Vehicle..............................................5-10
Power Liftgate.................................................................3-45
Power Outlet .................................................................3-166
Rear Cross-traffic Collision Warning (RCCW)/
Rear Cross-traffic Collision-avoidance Assist
(RCCA)........................................................................5-67
System Description ....................................................5-67
System Setting and Activation ...................................5-68
Warning and System Control .....................................5-69
Limitations of the System ..........................................5-73
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Index
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I-8
Rear Seats .......................................................................2-10
Rear View Monitor .......................................................3-109
Rear Window Wiper and Washer..................................3-104
Recommended Lubricants and Capacities ........................8-6
Reducing the Risk of a Rollover ..................................5-121
Reduction Gear ...............................................................5-11
Reduction Gear Operation ..........................................5-11
Parking........................................................................5-13
LCD Display Messages ..............................................5-13
Good Driving Practices ..............................................5-16
Refrigerant Label ..............................................................8-8
Remote Smart Parking Assist (RSPA) ..........................3-113
Operating Condition .................................................3-114
Non-operating Condition ..........................................3-115
Limitations of the System ........................................3-116
How the System Works (Smart Parking) .................3-120
How the System Works (Remote Smart Parking)....3-127
How the System Works (Smart Exit) .......................3-131
How the System Works
(Remote Moving Forward/Backward) ..................3-138
Additional Instructions (Messages)..........................3-143
Turn signal Showing Vehicle Status while System
in Activation ..........................................................3-144
Smart Key Showing Vehicle Status while System
in Activation ..........................................................3-145
Link with other Systems ..........................................3-146
Reporting Safety Defects ................................................8-10
Roof Side Rails .............................................................3-176Scheduled maintenance services.......................................7-7
Normal Maintenance Schedule ....................................7-8
Maintenance Under Severe Usage Conditions...........7-10
Seat Belt Restraint System .............................................2-24
Seat Belt Warning Light .................................................2-22
Seat Belts ........................................................................2-21
Seat Belt Safety Precautions ......................................2-21
Seat Belt Warning Light .............................................2-22
Seat Belt Restraint System .........................................2-24
Additional Seat Belt Safety Precautions ....................2-32
Care of Seat Belts .......................................................2-35
Seat Warmers and Air Ventilation Seats .........................2-17
Seats ..................................................................................2-4
Safety Precautions ........................................................2-5
Front Seats ....................................................................2-6
Rear Seats ...................................................................2-10
Head Restraints ..........................................................2-13
Seat Warmers and Air Ventilation Seats.....................2-17
Side View Mirrors...........................................................3-31
Smart Cruise Control With Stop & Go System ..............5-98
Smart Cruise Control Switch .....................................5-99
To Adjust the Sensitivity of Smart Cruise Control ..5-100
To Convert to Cruise Control Mode ........................5-100
Smart Cruise Control Speed .....................................5-101
Index
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