
415
uuWhen Driving uTire Pressure Monitoring System (TPMS)
Continued
Driving
Tire Pressure Monitoring System (TPMS)
Instead of directly measuring the pressure  in each tire, the TPMS on this vehicle 
monitors and compares the rolling radius  and rotational characteristics of each 
wheel and tire while you are driving to  determine if one or more tires are 
significantly under-inflated. This will caus e the low tire pressure/TPMS indicator to 
come on and a message to appear on  the driver information interface.
You must start TPMS calibration every time you:
• Adjust the pressure in one or more tires.
• Rotate the tires.
• Replace one or more tires.
Before calibrating the TPMS:
• Set the cold tire pressure in all four tires.
2 Checking Tires  P. 468
Make sure:
•The vehicle is at a complete stop.
• The gear position is in 
(P.
• The power mode is in ON.
■TPMS Calibration
1Tire Pressure Monitoring System (TPMS)
The system does not monitor the tires when driving 
at low speed.
Conditions such as low  ambient temperature and 
altitude change directly a ffect tire pressure and can 
trigger the low tire pressure/TPMS indicator to come on.
Tire pressure checked and inflated in:
•Warm weather can beco me under-inflated in 
colder weather.
•Cold weather can become  over-inflated in warmer 
weather.
The low tire pressure/TPMS indicator will not come 
on as a result of over inflation.
The TPMS may not function pr operly if tire type and 
size are mixed. Make sure to use the same size and 
type of tire. 2 Checking and Maintaining Tires  P. 468
The low tire pressure/TPMS indicator may come on 
with a delay or may not come on at all when:
•You rapidly accelerate, decelerate, or turn the 
steering wheel.
•You drive on snowy or slippery roads.
•Tire chains are used.
The low tire pressure/TPMS indicator may come on 
under the following conditions:
•There is a heavier and uneve n load on the tires than 
the condition at calibration.
•Tire chains are used.
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uuWhen Driving uTire Pressure Monitoring System (TPMS)
416
Driving
You can calibrate the system from the 
customized feature on the audio/information 
screen.
1. Set the power mode to ON.
2. Select .
3. Select  Settings .
4. Select  Vehicle .
5. Select  TPMS Calibration .
6. Select  Cancel  or Calibrate .
u When the calibration is complete, the 
display returns to the customization 
menu screen.
• If the  Calibration Failed To Start.  
message appears, repeat steps 4-6.
• The calibration pr ocess finishes 
automatically.1 TPMS Calibration
•The calibration process  requires approximately 30 
minutes of cumulative dr iving at speeds between 
30-65 mph (48-105 km/h).
•During this period, if the power system is turned on 
and the vehicle is not moved within 45 seconds, 
you may notice the low  tire pressure/TPMS 
indicator comes on briefl y. This is normal and 
indicates that the calibr ation process is not yet 
complete.
If tire chains are installed, remove them before 
calibrating the TPMS.
If the low tire pressure/TPMS indicator comes on even 
when the properly inflated specified regular tires are 
installed, have your vehicl e checked by an authorized 
Honda Clarity Fuel Cell dealer.
We recommend that the tires be replaced with the 
same brand, model, and size  as the originals. Ask an 
authorized Honda Clarity Fuel  Cell dealer for details.
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417
uuWhen Driving uTire Pressure Monitoring System (TPMS) - Required Federal Explanation
Continued
Driving
Tire Pressure Monitoring  System (TPMS) - Required 
Federal Explanation
Each tire, including the spare (if provided), should be checked 
monthly when cold and inflated  to the inflation pressure 
recommended by the vehicle manufa cturer on the vehicle placard 
or tire inflation pressure label.
(If your vehicle has tires of a diff erent size than the size indicated 
on the vehicle placard or tire inflation pressure label, you should 
determine the proper tire inflat ion pressure for those tires.)
As an added safety feature, your  vehicle has been equipped with 
a tire pressure monitoring system  (TPMS) that illuminates a low 
tire pressure telltale 
when one or more of your tires  is significantly under-inflated.
Accordingly, when the  low tire pressure telltale illuminates, you 
should stop and check your tires  as soon as possible, and inflate 
them to the proper pressure.
Driving on a significantly under-inf lated tire causes the tire to 
overheat and can lead to tire fail ure. Under-inflation also reduces 
fuel efficiency and tire tread life, and may affect  the vehicle’s 
handling and stopping ability.
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418
uuWhen Driving uTire Pressure Monitoring System (TPMS) - Required Federal Explanation
Driving
Please note that the TPMS is not  a substitute for proper tire 
maintenance, and it is the driver ’s responsibility to maintain 
correct tire pressure, even if un der-inflation has not reached the 
level to trigger illumina tion of the TPMS low ti re pressure telltale.
Your vehicle has also been eq uipped with a TPMS malfunction 
indicator to indicate when the sy stem is not operating properly. 
The TPMS malfunction indicator is combined with the low tire 
pressure telltale. When the system detects a malfunction, the 
telltale will flash fo r approximately one minute and then remain 
continuously illuminated. This sequence will continue upon 
subsequent vehicle start-ups as  long as the malfunction exists.
When the malfunction indicator is  illuminated, the system may 
not be able to detect or signal low tire pressure as intended.
TPMS malfunctions may  occur for a variety of reasons, including 
the installation of replacement or  alternate tires or wheels on the 
vehicle that prevent the TPMS from functioning properly.
Always check the TPMS malfunction  telltale after replacing one or 
more tires or wheels on your vehicle to ensure that the 
replacement or alternate tires  and wheels allow the TPMS to 
continue to function properly.
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422
uuWhen Driving uLaneWatchTM
Driving
LaneWatchTM
LaneWatch is an assistance system that allows you to check the passenger side rear 
areas displayed on the audio/information screen  when the turn signal is activated to 
the passenger’s side. A camera in the pass enger side door mirror monitors these 
areas and allows you to chec k for vehicles, in addition to your visual check and use 
of the passenger door mirror. You can also keep the system on for your convenience 
while driving.1 LaneWatchTM
Important Safety Reminder
Like all assistance systems, LaneWatch has 
limitations. Over reliance on LaneWatch may result in 
a collision.
The LaneWatch function can be  affected by weather, 
lighting (including headli ghts and low sun angle), 
ambient darkness, camera  condition, and loading.
The LaneWatch may not prov ide the intended display 
of traffic to the side and rear under the following 
conditions:
•Your vehicle’s suspensi on has been altered, 
changing the height of the vehicle.
•Your tires are over or under inflated.•Your tires or wheels are of varied size or 
construction.
3WARNING
Failure to visually confirm that it is safe to 
change lanes before doing so may result in 
a crash and serious  injury or death.
Do not rely only on LaneWatch while 
driving.
Always look in your mi rrors, to either side 
of your vehicle, and behind you for other 
vehicles before changing lanes.
12
Camera
Move the turn signal 
lever to the passenger 
side.
Press the LaneWatch 
button.The passenger side view 
display appears on the 
audio/information screen.
The system activates when you:
The system deactivates when you press 
the LaneWatch button again.
Audio/Information Screen
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437
uuBraking uCollision Mitigation Braking SystemTM (CMBSTM)
Continued
Driving
■Vehicle conditions
• Headlight lenses are dirty or the h eadlights are not properly adjusted.
• The outside of the windshield is blocked by dirt, mud, leaves, wet snow, etc.
• The inside of the windshield is fogged.
• An abnormal tire or wheel condition (wrong  sized, varied size or construction, 
improperly inflated tire, etc.).
• When tire chains are installed.
• The vehicle is tilted due to a heavy load or  suspension modifications.
• The camera temperature gets too high.
• Driving with the parking brake applied.
• When the radar sensor in the front grille gets dirty.
■Detection limitations
• A vehicle or pedestrian suddenly crosses in front of you.
• The distance between your vehicle and the  vehicle or pedestrian ahead of you is 
too short.
• A vehicle cuts in front of you at a  slow speed, and it brakes suddenly.
• When you accelerate rapidly and approach  the vehicle or pedestrian ahead of you 
at high speed.
• The vehicle ahead of you is a motorcycle,  bicycle, mobility scooter or other small 
vehicle.
• When there are animals in front of your vehicle.
• When you drive on a curved, winding or und ulating road that makes it difficult for 
the sensor to properly detect a vehicle in front of you.
• The speed difference between your vehicle an d a vehicle or pedestrian in front of 
you is significantly large.
• An oncoming vehicle suddenly comes in front of you.
• Another vehicle suddenly comes in fr ont of you at an intersection, etc.
• Your vehicle abruptly crosses over in front of an oncoming vehicle.
• When driving through a narrow iron bridge.
• When the lead vehicle suddenly slows down.
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438
uuBraking uCollision Mitigation Braking SystemTM (CMBSTM)
Driving
• When there is a group of people in front of your vehicle walking together side by 
side.
• Surrounding conditions or belongings of the pedestrian alter the pedestrian’s 
shape, preventing the system from recogn izing that the person is a pedestrian.
• When the pedestrian is shorter than about 3.3 feet (1 me ter) or taller than about 
6.6 feet (2 meters) in height.
• When a pedestrian blends in with the background.
• When a pedestrian is bent over or squa tting, or when their hands are raised or 
they are running.
• When several pedestrians are walking ahead in a group.
• When the camera cannot correctly identify  that a pedestrian is present due to an 
unusual shape (holding luggage, body position, size).
■Automatic shutoff
The CMBSTM may automatically shut itself off and the CMBSTM indicator comes and 
stays on when:
• The temperature inside the system is high.
• You drive off-road or on a mountain ro ad, or curved and winding road for an 
extended period.
• An abnormal tire condition is detected  (wrong tire size, flat tire, etc.).
• The camera behind the rearview mirror, or the area around the camera, including 
the windshield, gets dirty.
Once the conditions that caused the CMBS
TM to shut off improve or are addressed 
(e.g., cleaning), the system comes back on.
Limitations applicable to  pedestrian detection only
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468
Maintenance
Checking and Maintaining Tires
Checking Tires
To safely operate your vehicle, your tires must be of the proper type and size, in 
good condition with adequate tread, and properly inflated.
■Inflation guidelines
Properly inflated tires provide  the best combination of handling, tread life, and comfort. 
Refer to the driver’s doorjamb label or spec ifications page for the specified pressure.
Underinflated tires wear unevenly, adversely affect handling and fuel economy, and 
are more likely to fail from overheating.
Overinflated tires make your vehicle ride harshly, are more prone to road hazards, 
and wear unevenly.
Every day before you drive, look at each of  the tires. If one looks lower than the 
others, check the pressure with a tire gauge.
At least once a month or before long trips, use a gauge to measure the pressure in 
all tires. Even tires in good condition ca n lose 1–2 psi (10–20 kPa, 0.1–0.2 kgf/cm
2) 
per month.
■Inspection guidelines
Every time you check inflation, also  examine the tires and valve stems.
Look for:
• Bumps or bulges on the side or in the tread. Replace the tire if you find any cuts, 
splits, or cracks in the si de of the tire. Replace it if you see fabric or cord.
• Remove any foreign objects  and inspect for air leaks.
• Uneven tread wear. Have an authorized  Honda Clarity Fuel Cell dealer check the 
wheel alignment.
• Excessive tread wear.
2 Wear Indicators  P. 473
•Cracks or other damage around valve stem.
1Checking Tires
Measure the air pressure when tires are cold. This 
means the vehicle has been parked for at least three 
hours, or driven less than 1 mile (1.6 km). If 
necessary, add or releas e air until the specified 
pressure is reached.
If checked when hot, tire pressure can be as much as 
4–6 psi (30–40 kPa, 0.3–0.4 kgf/cm
2) higher than if 
checked when cold.
Whenever tire pressure is adjusted, you must 
calibrate the TPMS. 2 TPMS Calibration  P. 415
Have an authorized Honda  Clarity Fuel Cell dealer 
check the tires if you feel a consistent vibration while 
driving. New tire s and any that have been removed 
and reinstalled  should be properly balanced.
3WARNING
Using tires that are excessively worn or 
improperly inflated can cause a crash in 
which you can be seriously hurt or killed.
Follow all instruction s in this owner’s 
manual regarding ti re inflation and 
maintenance.
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