
479
uuMaintenance MinderTMuTo Use Maintenance MinderTM
Continued
Maintenance
■Maintenance Service Items1Maintenance Service Items
•Adjust the valves during services A, 0, 1, 2, or 3 if 
they are noisy.
Maintenance Minder Message
System Message 
Indicator
Sub Items
Main Item
U.S. models
*1: If a Maintenance Minder message does not appear more than 12 months after the display is reset, 
change the engine oil every year.
# : See information on maintenance and emissions warranty.
CODEMaintenance Main Items
A
●Replace engine oil*1 and oil filter
0●Inspect front and rear brakes●Check expiration date for Temporary Tire Repair Kit●Inspect these items: • Tie rod ends, steering gearbox, and boots
• Suspension components
• Driveshaft boots
• Brake hoses and lines  (including ABS/VSA)
• All fluid levels and condition of fluids
• Exhaust system
#
•Fuel lines and connections#
•Stay RR, RR Subframe
• Under body battery cover
*2: If you drive primarily in urban areas that have high concentrations of soot in the air from industry and 
from diesel-powered vehicles, replace the dust and pollen filter every 15,000 miles (24,000 km).
*3: Driving in mountainous areas at very low vehicle speeds results in higher transmission temperatures. 
This requires transmission fluid changes more frequently than recommended by the Maintenance 
Minder. If you regularly drive your vehicle under these conditions, have the transmission fluid changed 
every 47,500 miles (75,000 km) or 3 years.
*4: If a Maintenance Minder message does not appear more than 36 months after the display for item 7 is  reset, change the brake fluid every 3 years.
*5: If you drive in dusty conditions, replace the air cleaner element every 15,000 miles (24,000 km).
CODEMaintenance Sub Items
1
●Rotate tires
2●Replace dust and pollen filter*2
3●Replace transmission fluid*3
4●Replace spark plugs●Inspect valve clearance
5
●Replace engine coolant
7●Replace brake fluid*4
8●Replace air cleaner element*5
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480
uuMaintenance MinderTMuTo Use Maintenance MinderTM
Maintenance
1Maintenance Service Items
•Adjust the valves during services A, 9, 1, 2, or 3 if 
they are noisy.
Canadian models
*1: If a Maintenance Minder message does not appear more than 12 months after the display is reset, 
change the engine oil every year.
*2: If you drive primarily in urban areas that have high concentrations of soot in the air from industry and  from diesel-powered vehicles, replace the dust and pollen filter every 24,000 km (15,000 miles).
*3: Driving in mountainous areas at very low vehicle speeds results in higher transmission temperatures. 
This requires transmission fluid changes more frequently than recommended by the Maintenance 
Minder. If you regularly drive your vehicle under these conditions, have the transmission fluid changed 
every 75,000 km (47,500 miles) or 3 years.
*4: If a Maintenance Minder message does not appear more than 36 months after the display for item 7 is  reset, change the brake fluid every 3 years.
*5: If you drive in dusty conditions, replace the air cleaner element every 24,000 km (15,000 miles).
# : See information on maintenance and emissions warranty.
CODEMaintenance Main Items
A
●Replace engine oil*1 and oil filter
CODEMaintenance Sub Items
1
●Rotate tires
2●Replace dust and pollen filter*2
3●Replace transmission fluid*3
4●Replace spark plugs●Inspect valve clearance
5
●Replace engine coolant
7●Replace brake fluid*4
8●Replace air cleaner element*5
9●Service front and rear brakes●Check expiration date for Temporary Tire Repair Kit●Inspect these items: • Tie rod ends, steering gearbox, and boots
• Suspension components
• Driveshaft boots
• Brake hoses and lines (including ABS/VSA)
• All fluid levels and condition of fluids
• Exhaust system
#
•Fuel lines and connections#
•Stay RR, RR Subframe
• Under body battery cover
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490
uuMaintenance Under the Hood uEngine Coolant
Maintenance
Engine Coolant
This coolant is premixed with 50% antifreeze and 50% water. Do not add any 
straight antifreeze or water.
We recommend you check the engine coolan t level every time you refuel or you 
charge the High Voltage battery. Check the re serve tank first. If it is completely 
empty, also check the coolant level in  the radiator. Add the engine coolant 
accordingly.
1. Make sure the engine and radiator are cool.
2. Check the amount of coolant in the reserve 
tank.
u If the coolant level is below the  MIN 
mark, add the specified coolant until it 
reaches the  MAX mark.
3. Inspect the cooling  system for leaks.
Specified coolant: Honda Long  Life Antifreeze/Coolant Type 2
■Reserve Tank
1Engine Coolant
NOTICE
Genuine Honda engine coolan t is a 50/50 mixture of 
antifreeze and water that can withstand freezing at 
temperatures as low as about −31°F (−35°C). If your 
vehicle is consistently subjected to temperatures 
below this, the concentration of antifreeze in the 
coolant should be  increased. Consult an authorized 
Honda Clarity Plug-In Hybrid dealer for details.
If Honda antifreeze /coolant is not available, you may 
use another major brand of  non-silicate coolant as a 
temporary replacement. Check that it is a high quality 
coolant recommended for  aluminum engines. 
Continued use of any non-Honda coolant can result 
in corrosion, causing the cooling system to 
malfunction or fail. Have the cooling system flushed 
and refilled with Honda anti freeze/coolant as soon as 
possible.
Do not add rust inhibitors or other additives to your 
vehicle’s cooling system. They may not be compatible 
with the coolant or with the engine components.
Reserve 
Tank
MAX
MIN
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491
uuMaintenance Under the Hood uEngine Coolant
Maintenance
1. Make sure the engine and radiator are 
cool.
2. Turn the radiator cap 1/8 turn counter-
clockwise and relieve any pressure in the 
cooling system.
3. Push down and turn the radiator cap 
counter-clockwise to remove it.
4. The coolant level should be up to the base 
of the filler neck. Add coolant if it is low.
5. Put the radiator cap back on, and tighten it 
fully.
■Radiator1Radiator
NOTICE
Pour the fluid slowly and ca refully so you do not spill 
any. Clean up any spills immediately; they can 
damage components in the engine compartment.
3WARNING
Removing the radiator cap while the 
engine is hot can cause the coolant to spray 
out, seriously scalding you.
Always let the engine and radiator cool 
down before removing  the radiator cap.
Radiator Cap
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492
uuMaintenance Under the Hood uCooling System
Maintenance
Cooling System
Coolant is used to reduce the temperature  of the high voltage battery and inverter 
coolant. When checking the c oolant level, make sure to follow the procedures listed 
below. If the coolant level is below the  MIN mark, have your vehicle inspected by an 
authorized Honda  Clarity Plug-In Hybrid dealer.
1.Check the fluid level in the tank.
2. If the coolant level has dropped below the 
MIN  level, have your vehicle serviced at an 
authorized Honda Clarity Plug-In Hybrid 
dealer.
u Only a properly trained technician can 
refill the coolant an d check the system 
for leaks.
Specified coolant: Honda Long  Life Antifreeze/Coolant Type 2
■Checking the Inverter Coolant Level
1Cooling System
NOTICE
Genuine Honda engine coolan t is a 50/50 mixture of 
antifreeze and water that can withstand freezing at 
temperatures as low as about −31°F (−35°C). If your 
vehicle is consistently subjected to temperatures 
below this, the concentration of antifreeze in the 
coolant should be  increased. Consult an authorized 
Honda Clarity Plug-In Hybrid dealer for details.
Only use the genuine Honda coolant.
Expansion Tank
MAX
MIN
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493
uuMaintenance Under the Hood uCooling System
Maintenance
1. Check the fluid level in the tank from the 
window.
2. If the coolant level has dropped below the 
MIN  level, have your ve hicle serviced at an 
authorized Honda Clarity Plug-In Hybrid 
dealer.
u Only a properly trained technician can 
refill the coolant and check the system 
for leaks.
■Checking the Coolant Level for the High Voltage Battery 
and Related Parts
MAX
MINWindow
Expansion Tank
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uuOverheating uHow to Handle Overheating
546
Handling the Unexpected
■Next thing to do
1.Check that the cooling fan is operating and 
turn the power system off once the  Stop 
Driving When Safe. Engine 
Temperature Too Hot  message 
disappears.
u If the cooling fan is not operating, 
immediately turn the power system off.
2. Once the engine has  cooled down, inspect 
the coolant level an d check the cooling 
system components for leaks.
u If the coolant level in the reserve tank is 
low, add coolant until it reaches the 
MAX  mark.
u If there is no coolan t in the reserve tank, 
check that the radiator is cool. Cover the 
radiator cap with a heavy cloth and open 
the cap. If necessary, add coolant up to 
the base of the filler neck, and put the 
cap back on.
■Last thing to do
Once the engine has cooled sufficiently, turn the power system on.
If the  Stop Driving When Safe. Engine Temperature Too Hot  message does not 
appear, resume driving. If it appears ag ain, contact an authorized Honda Clarity 
Plug-In Hybrid dealer for repairs.
1 The  Stop Driving When Safe.  Engine Temperature Too 
Hot Message Appears on the Multi-Information Display
If the coolant is leaking, contact an authorized Honda 
Clarity Plug-In Hybrid  dealer for repairs.
Use water as an emergency/temporary measure only. 
Have an authorized Honda Clarity Plug- In Hybrid 
dealer flush the system wi th proper antifreeze as 
soon as possible.
3WARNING
Removing the radiator cap while the 
engine is hot can cause the coolant to spray 
out, seriously scalding you.
Always let the engine and radiator cool 
down before removing  the radiator cap.
Reserve Tank
MAX
MIN
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Index
580
Index
Index
Numbers
120V AC (AC Level 1)................................ 459
12-Volt Battery Charging System  Indicator ............................................  90, 548
240V AC (AC Level 2) ................................ 462
A
ABS (Anti-lock Brake System) ................... 440
Accessories and Modifications ................. 521
Accessory Power Sockets ..........................  189
Acoustic Vehicle Alerting System ............ 395
Adaptive Cruise Control (ACC) with Low 
Speed Follow (LSF) .................................. 402
Indicator .................................................. 100
Additives
Coolant ................................................... 490
Engine Oil ................................................ 484
Washer .................................................... 495
Additives, Engine Oil ................................ 484
Adjusting
Armrest ................................................... 182
Front Seats ..............................................  175
Head Restraints........................................ 178
Mirrors .................................................... 173
Steering Wheel ........................................ 172
Temperature ............................................ 126
Agile Handling Assist ................................ 427
Air Conditioning System (Climate Control  System) .................................................... 193
Changing the Mode ................................ 195 Defrosting the Windshield and 
Windows ...............................................  197
Dust and Pollen Filter...............................  514
Sensors ...................................................  201
Synchronized Mode.................................  198
Using Automatic Climate Control ............  193
Air Pressure .......................................  502, 569
Airbags ........................................................  54
Advanced Airbags .....................................  60
Airbag Care...............................................  68
Driver’s Knee Airbag..................................  61
Event Data Recorder ....................................  0
Front Airbags (SRS) ....................................  57
Indicator..............................................  66, 94
Passenger Front Airbag Off Indicator .........  67
Sensors .....................................................  54
Side Airbags ..............................................  63
Side Curtain Airbags..................................  65
AM/FM Radio ............................................  243
Android Auto ...........................................  280
Anti-lock Brake System (ABS) ..................  440
Indicator....................................................  93
Apple CarPlay ...........................................  277
Armrest .....................................................  182
Audio Remote Controls ...........................  207
Audio System ....................................  204, 210
Adjusting the Sound................................  236
Audio/Information Screen........................  211
Changing the Home Screen Icon Layout ..  219
Changing the Screen Interface ................  233
Closing Apps ...........................................  235 Customizing the Meter ...........................  219
Display Setup ..........................................  237
Error Messages .......................................  284
General Information................................  288
Home Screen ..........................................  225
Limitations for Manual Operation ............  238
Menu Customize ....................................  234
MP3/WMA/AAC .....................................  264
Reactivating ............................................  206
Recommended Devices ...........................  290
Remote Controls .....................................  207
Security Code .........................................  206
Selecting an Audio Source ......................  238
Status Area .............................................  232
Theft Protection ......................................  206
USB Flash Drives......................................  290
USB Port .................................................  205
Voice Control Operation .........................  239
Wallpaper Setup .....................................  223
Audio/Information Screen .......................  211
Authorized Manuals ................................  577
Auto Door Locking/Unlocking ................  149
Automatic Brake Hold .............................  438
Indicator ...........................................  87, 438
Automatic Brake Hold System
Indicator ...........................................  87, 438
Automatic Lighting ..................................  163
Average Fuel Economy ............................  126
Average Fuel Economy Records ..............  129
Average Speed .........................................  127
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