2017 TOYOTA MIRAI heating

952. Fuel cell vehicle
2
Fuel cell system
MIRAI_OM_USA_OM62023U
◆Using Eco drive mode
Using Eco drive mode (→P. 181) makes torque generation less
aggressive than normal when stepping on the accelerator pedal,
leading to improvement in fuel economy.
Also, is displayed on the air conditioning screen, indicating
the switch to ECO HEAT/COOL mode ( →P. 260).
◆Air conditioning system on/off
● Turn off the air conditioning sy stem operation switch except
when necessary to help curb fuel consumption.
In summer: When the ambient temper ature is high, use the recircu-
lated air mode. This decreas es the load on the air con-
ditioning system.
In winter: Avoid excess heating. Use the seat heater to minimize
the need for cabin heating ( →P. 268).
● By pushing , ECO HEAT/COOL mode is turned on. This
helps curb fuel consumption even with the air conditioning system
turned on.
◆Checking tire inflation pressure
Make sure to check the tire infl ation pressure frequently. Improper
tire inflation pressure can cause poor fuel economy.
Additionally, snow tire s have more rolling friction and their use on
dry roads lead to poor fuel econom y. Use tires that are appropriate
for the season.
◆Luggage
Avoid carrying unnecessary luggage and unload excess weight in
order avoid poor fuel ec onomy. Installing a large roof rack will also
reduce fuel economy.

1063. Instrument cluster
MIRAI_OM_USA_OM62023U■
Outside temperature display
●In the following situations, the correct outside temperature may not be dis-
played, or the display may take longer than normal to change.
• When stopped, or driving at low speeds (less than 16 mph [25 km/h])
• When the outside temperature has changed suddenly (at the entrance/
exit of a garage, tunnel, etc.)
● When “--” or “E” is displayed, the system may be malfunctioning.
Take your vehicle to your Toyota dealer.
■ Liquid crystal display
Small spots or light spots may appear on the display. This phenomenon is
characteristic of liquid crystal displays, and there is no problem continuing to
use the display.
■ Customization
The meter display can be customized on the multi-information display.
(Customizable features: →P. 439)
NOTICE
■To prevent damage to the fuel cell system and its components
This vehicle is equipped with high coolant temperature warning light
(→ P. 369), instead of, coolant temperature gauge.
The fuel cell system may be overheating if the high coolant temperature
warning light flashes or comes on. In this case, immediately stop the
vehicle in a safe place, and check the fuel cell system after it has cooled
completely.

1865-2. Driving procedures
MIRAI_OM_USA_OM62023U
Parking brake
To set the parking brake, fully
depress the parking brake pedal
with your left foot while depress-
ing the brake pedal with your right
foot.
(Depressing the pedal again
releases the parking brake.)
■Parking brake engaged warning buzzer
A buzzer will sound if the vehicle is driven with the parking brake engaged.
“Release Parking Brake” is displayed on the multi-information display.
■ Warning messages and buzzers
Warning messages and buzzers are used to indicate a system malfunction or
to inform the driver of the need for caution. If a warning message is shown on
the multi-information display, read the message and follow the instructions.
■ If the brake system warning light comes on
→P. 369
■ Usage in winter time
→P. 254
Operating instructions
NOTICE
■When parking the vehicle
Before you leave the vehicle, shift the shift position to P, set the parking
brake and make sure that the vehicle does not move.
■ Before driving
Fully release the parking brake.
Driving the vehicle with the parking brake set will lead to brake components
overheating, which may affect braking performance and increase brake
wear.

2355-5. Using the driving support systems
5
Driving
MIRAI_OM_USA_OM62023U■
Reduced effectiveness of the EPS system
The effectiveness of the EPS system is reduced to prevent the system from
overheating when there is frequent steering input over an extended period of
time. The steering wheel may feel heavy as a result. Should this occur, refrain
from excessive steering input or stop the vehicle and turn the fuel cell system
off. The EPS system should return to normal within 10 minutes.
■ Automatic reactivation of TRAC and VSC systems
After turning the TRAC and VSC systems off, the systems will be automati-
cally re-enabled in the following situations:
● When the power switch is turned off
● If only the TRAC system is turned off, the TRAC will turn on when vehicle
speed increases
If both the TRAC and VSC systems are turned off, automatic re-enabling will
not occur when vehicle speed increases
■ Operating conditions of hill-start assist control
When the following four conditions are met, the hill-start assist control will
operate:
● The shift position is in a position other than P or N (when starting off forward/
backward on an upward incline).
● The vehicle is stopped.
● The accelerator pedal is not depressed.
● The parking brake is not engaged.
■ Automatic system cancelation of hill-start assist control
The hill-start assist control will turn off in any of the following situations:
● Shift the shift position to P or N.
● The accelerator pedal is depressed.
● The parking brake is engaged.
● Approximately 2 seconds elapse after the brake pedal is released.
■ Operating conditions of emergency brake signal
When the following three conditions are met, the emergency brake signal will
operate:
●The emergency flashers are off.
● Actual vehicle speed is over 35 mph (55 km/h).
● The brake pedal is depressed in a manner that cause the system to judge
from the vehicle deceleration that this is a sudden braking operation.
■ Automatic system cancelatio n of emergency brake signal
The emergency brake signal will turn off in any of the following situations:
● The emergency flashers are turned on.
● The brake pedal is released.
● The system judges from the vehicle deceleration that is not a sudden brak-
ing operation.

2636-1. Using the air conditioning system and defogger
6
Interior features
MIRAI_OM_USA_OM62023U■
Fogging up of the windows
●The windows will easily fog up when the humidity in the vehicle is high.
Turning on will dehumidify the air from the outlets and defog the wind-
shield effectively.
● If you turn off, the windows may fog up more easily.
● The windows may fog up if the recirculated air mode is used.
■ Windshield fog detection function
When automatic mode is set, the humidity sensor ( →P. 266) detects fog on
the windshield and controls the air conditioning system to prevent fog.
■ Outside/recirculated air mode
●When driving on dusty roads such as tunnels or in heavy traffic, set the out-
side/recirculated air mode button to recirculated air mode. This is effective in
preventing outside air from entering the vehicle interior. During cooling oper-
ation, setting the recirculated air mode will also cool the vehicle interior
effectively.
● Outside/recirculated air mode may automatically switch depending on the
temperature setting or the inside temperature.
■ Operation of the air conditioni ng system in ECO HEAT/COOL mode
● In ECO HEAT/COOL mode, the air conditioning system is controlled as fol-
lows to prioritize fuel efficiency:
• Fluid (heating) heater and compressor operation controlled to restrict
heating/cooling capacity
• Fan speed restricted when automatic mode is selected
● To improve air conditioning performance, perform the following operations:
• Adjust the temperature settings and fan speed
• Touch while in , and is set
• Touch while in , and ECO HEAT/COOL mode is canceled
■ Operation of the air conditio ning system in Eco drive mode
When ECO MODE switch is pressed, oper ations switch over to ECO HEAT/
COOL mode. ( →P. 183)
■ When the outside temperature exceeds 75°F (24°C) and the air condition-
ing system is on
● In order to reduce the air conditioning power consumption, the air condition-
ing system may switch to recirculated air mode automatically. This may also
reduce fuel consumption.
● Recirculated air mode is selected as a default mode when the power switch
is turned to ON mode.
● It is possible to switch to outside air mode at any time by pressing .

2676-1. Using the air conditioning system and defogger
6
Interior features
MIRAI_OM_USA_OM62023U
Heated steering wheel/seat heaters
Turn the heated steering wheel
on/off
The indicator light comes on when
the heated steering wheel is oper-
ating.
Heated steering wheel and seat heaters heat the side grips of the
steering wheel and seats, respectively.
WARNING
● Care should be taken to prevent injury if anyone in the following categories
comes in contact with the steering wheel and seats when the heater is on:
• Babies, small children, the elderly, the sick and the physically chal-
lenged
• Persons with sensitive skin
• Persons who are fatigued
• Persons who have taken alcohol or drugs that induce sleep (sleeping drugs, cold remedies, etc.)
● Observe the following precautions to prevent minor burns or overheating,
• Do not use seat heater more than necessary.
• Do not cover the seat with a blanket or cushion when using the seat
heater.
NOTICE
●Do not put heavy objects that have an uneven surface on the seat and do
not stick sharp objects (needles, nails, etc.) into the seat.
● To prevent 12-volt battery discharge, do not use the functions when the
fuel cell system is off.
Heated steering wheel

4068-2. Steps to take in an emergency
MIRAI_OM_USA_OM62023U
If your vehicle overheats
The following may indicate that your vehicle is overheating.
● The high coolant temperature warning light ( →P. 369) comes on
or flashes, or a loss of fuel ce ll system power is experienced. (For
example, the vehicle s peed does not increase.)
● “FC System Overheat Out put Power is Limited” (→P. 376) is dis-
played on the multi- information display
● Steam comes out from under the hood.
Label
Fuel cell stack coolant
reservoir Inverter coolant reservoir

451Alphabetical index
MIRAI_OM_USA_OM62023U
Child-protectors....................... 123
Cleaning ........................... 306, 310Aluminum wheels.................. 307
Exterior ................................. 306
Interior................................... 310
Seat belts .............................. 311
Clock ......................................... 280
Coat hooks ............................... 281
Condenser ................................ 325
Console box ............................. 273
Coolant Capacity ................................ 419
Checking ............................... 324
Preparing and checking Warning light ...................... 369
Cooling system ........................ 324 Fuel cell system
overheating......................... 406
Cruise control Dynamic radar cruise
control................................. 203
Cup holders.............................. 274
Curtain shield airbags ............... 37
Customizable features ............ 434
Daytime running light system .................................... 188
Defogger Outside rear view mirrors...... 261
Rear window ......................... 261
Windshield ............................ 261
Dimensions .............................. 416
Dinghy towing .......................... 171 Display
Drive information .................. 108
Dynamic radar cruise
control ................................ 203
Energy monitor ..................... 108
LDA
(Lane Departure Alert) ....... 216
Multi-information display ....... 107
Warning message ................ 376
Do-it-yourself maintenance .... 318
Door courtesy lights Location ................................ 269
Wattage ................................ 421
Door lock
Doors .................................... 120
Key ....................................... 398
Smart key system ................. 120
Wireless remote control ........ 120
Doors Automatic door locking
and unlocking systems ....... 123
Door glasses......................... 154
Door lock .............................. 122
Door windows ....................... 154
Open door warning buzzer ... 124
Open door warning light ....... 371
Outside rear view mirrors ..... 151
Rear door child-protector ...... 123
Drive information..................... 108
Driver’s seat belt reminder light ........................................ 371
Driver’s seat position memory .................................. 140
D
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL”.