air condition TOYOTA MIRAI 2018 (in English) Service Manual

3778-2. Steps to take in an emergency
MIRAI_OM_USA_OM62025U
8
When trouble arises
*: A buzzer sounds the first time a message is shown on the multi-informa-
tion display.
■ System warning lights
The master warning light does not come on or flash in the following cases.
Instead, a separate system warning light will come on along wit h a message
shown on the multi-information display.
● Malfunction of the ABS
The ABS warning light comes on. ( P. 370)
● Malfunction of the charging system
The charging system warning light comes on. ( P. 3 6 9 )
■ If “High FC Temperature Reduced Power” is displayed
Lower the speed while check the safety, and run the vehicle like this for
several minutes.
If the message goes off, the vehicle can be driven as is, since it temporarily
overheated.
This message may be displayed when driving under severe operati ng con-
ditions.
(For example, when driving up a long steep hill.)
■ If “FC System Shutdown due to F reezing conditions Stop Your Veh icle in
a Safe Place and Contact Your Dealer” is displayed.
The fuel cell system is frozen and can not be started. Contact a Toyota
dealer.
■ If “Maintenance Required for Hybrid Battery Cooling Parts at Yo ur
Dealer” is displayed
The filter may be clogged, the air intake vent may be blocked or there may be
a gap in the duct. Have maintenance performed on the traction b attery cool-
ing component at your Toyota dealer.
Comes onDoes not sound
Indicates a condition, such as mal-
function of electrical components,
their condition, or indicates the
need for maintenance
FlashesDoes not sound
Indicates a situation, such as
when an operation has been per-
formed incorrectly, or indicates
how to perform an operation cor-
rectly
System
warning
light
Warning buzzer*Warning

4078-2. Steps to take in an emergency
MIRAI_OM_USA_OM62025U
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When trouble arises
■If the high coolant temperature warning light comes on or
flashes
Stop the vehicle in a safe place and turn off the air conditioning sys-
tem, and then stop t he fuel cell system.
If you see steam or coolant leaks:
Carefully lift the hood after the steam subsides.
If you do not see steam or coolant leaks:
Carefully lift the hood.
After the fuel cell system has
cooled down sufficiently,
inspect the hoses and radiator
core (radiator) for any leaks.
Fuel cell stack coolant sub
radiator
Fuel cell stack coolant radia-
tor
Electric cooling fans
If a large amount of coolant
leaks, immediately contact your
Toyota dealer.
NOTICE
Correction procedures
The fuel cell stack coolant is exclusive for
fuel cell stack usage. Damage may occur
when water or any other type of coolant
is used, so never use any other fluid.
If the fuel cell stack coolant is low, imme-
diately contact your Toyota dealer.

4098-2. Steps to take in an emergency
MIRAI_OM_USA_OM62025U
8
When trouble arises
■If “FC System Overheat Output Power is Limited” is displayed
on the multi-information display
Stop the vehicle in a safe place and turn off the air conditioning
system, and then stop th e fuel cell system.
If you see steam or coolant leaks:
Carefully lift the hood after the steam subsides.
If you do not see steam or coolant leaks:
Carefully lift the hood.
After the fuel cell system has
cooled down, inspect the
hoses and radiator core
(radiator) for any leaks.
Inverter coolant radiator
Electric cooling fans
If a large amount of coolant
leaks, immediately contact
your Toyota dealer.
The inverter coolant level is
satisfactory if it is between
the “FULL” and “LOW” lines
on the reservoir.Inverter coolant reservoir
“FULL”
“LOW”
Add inverter cool ant if neces-
sary.
Water can be used in an emer-
gency if inverter coolant is
unavailable.

4108-2. Steps to take in an emergency
MIRAI_OM_USA_OM62025U
Start the fuel cell system and turn the air conditioning system on
to check that the radiator coo ling fans operate and to check fo r
coolant leaks from t he radiator or hoses.
The fans operate when the air conditioning system is turned on immedi-
ately after a cold start. Confirm that the fans are operating b y checking
the fan sound and air flow. If it is difficult to check these, turn the air con-
ditioning system on and off repeatedly.
(The fans may not operate in freezing temperatures.)
If the fans are not operating:
Stop the fuel cell system immed iately and contact your Toyota
dealer.
If the fans are operating:
Have the vehicle inspected at the neare st Toyota dealer.
WARNING
■When inspecting under th e hood of your vehicle
Observe the following precautions.
Failure to do so may result in serious injury such as burns.
● If steam is seen coming from under the hood, do not open the ho od until
the steam has subsided. The motor compartment may be very hot.
● After the fuel cell system has been turned off, check that the “READY”
indicator is off.
When the fuel cell system is operating, the cooling fans may suddenly
operate even if the fuel cell system stops. Do not touch or app roach rotat-
ing parts such as the fans, which may lead to fingers or clothing (espe-
cially a tie, a scarf or a muffler) getting caught, resulting i n serious injury.
● Do not loosen the coolant reservoir caps or radiator cap, while the fuel cell
system and radiator are hot.
High temperature steam or coolant could spray out.

4289-1. Specifications
MIRAI_OM_USA_OM62025U
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation pres-
sure
Tire pressure when the vehicle has been
parked for three hours or more, or has not
been driven more than 1 mile or 1.5 km under
that condition
Maximum inflation
pressureThe maximum cold inflated pressure to which
a tire may be inflated, shown on the sidewall
of the tire
Recommended infla-
tion pressureCold tire inflation pressure recommended by a
manufacturer
Accessory weight
The combined weight (in excess of those stan-
dard items which may be replaced) of trans-
mission, power steering, power brakes, power
windows, power seats, radio and heater, to the
extent that these items are available as fac-
tory-installed equipment (whether installed or
not)
Curb weight
The weight of a motor vehicle with standard
equipment, including the maximum capacity of
fuel, oil and coolant, and if so equipped, air
conditioning and additional weight optional
engine
Maximum loaded vehi-
cle weight
The sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight
(d) Production options weight
Normal occupant
weight150 lb. (68 kg) times the number of occupants
specified in the second column of Table 1
*
that follows
Occupant distributionDistribution of occupants in a vehicle as speci-
fied in the third column of Table 1
* below

4399-2. Customization
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Vehicle specifications
■Automatic air conditioning system ( P. 256)
■Multi-information display ( P. 102)
*: When the meter control switches ( P. 108) of the is pressed, a return
to screen display message is displayed on the multi-information display.
FunctionDefault
settingCustomized setting
Reaction when the A/C
switch is pressed05 (Slow)01 (Fast)
to 05 (Slow)——O—
Operation noise when the
A/C switch is pressedOnOff——O—
Display popup when the A/C
switch is pressedOnOff——O—
A/C auto switch operationOnOffO——O
FunctionDefault settingCustomized setting
Unitsmiles
(MPGe)km
(kg/100km)—O——
Time for exchanging the ion
filter—Initialize—O——
Interruption
display
Navigation
system route
guidance
OnOff—O——
Instrument
panel
brightness
adjustment
OnOff—O——
Return to initial settings—Ye s—O——
Main display split screenSimpleSplit—O——
Monthly history of fuel
economy history—Clear—O——
Daily history of ECO log—Clear—O——
Monthly history of ECO log—Clear—O——
Calender date—Set—O——
Erase screen—Erase*—O——

449Alphabetical index
MIRAI_OM_USA_OM62025U
Alphabetical index
A/C ............................................ 256Air conditioning filter ............. 351
Automatic air conditioning
system ......... ....................... 256
ABS
(Anti-lock Brake System)...... 231
Function ................................ 231
Warning light ......................... 370
Air conditioning filter .............. 351
Air conditioning system .................................... 256
Air conditioning filter ............. 351
Airbags ....................................... 36 Airbag operating conditions .... 44
Airbag preca utions for
your child .............................. 39
Airbag warning light .............. 370
Correct driving posture ........... 28
Curtain shield airbag operating conditions ............. 45
Curtain shield airbag precautions ........................... 42
Front passenger occupant
classification syst em............. 49
General airbag precautions .... 39
Locations of airbags................ 36
Modification and disposal of airbags ............... 43
Seat cushion airbag ................ 36
Side airbag operating conditions ............................. 45
Side airbag precautions .......... 41
Side and curtain shield airbags operating conditions ............. 45
Side and curtain shield airbags precautions ........................... 42
SRS airbags............................ 36 Alarm .......................................... 74
Anchor brackets ........................ 69
Antennas
(smart key system) ............... 131
Anti-lock Brake System
(ABS) ...................................... 231 Function ................................ 231
Warning light......................... 370
Armrest..................................... 279
Assist grips .............................. 280
Audio input
*
Audio system*
Steering wheel audio switch*
Automatic air conditioning system.................................... 256 Air conditioning filter ............. 351
Automatic headli ght leveling
system.................................... 189
Automatic High Beam ............. 190
Automatic light control system.................................... 187
AUX port
*
Auxiliary box ............................ 274
A
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL”.

454Alphabetical index
MIRAI_OM_USA_OM62025U
Opening the fuel door ........... 198
Overheating .......................... 406
Power output restriction .......... 88
Power switch......................... 172
Precautions ............................. 82
Regenerative braking.............. 81
Road accident cautions .......... 92
Running out of fuel.................. 85
Service plugs .......................... 91
Sounds and vibrations ............ 80
Starting the system............... 172
Traction battery air intake vent....................................... 85
Vehicle proximity notification
system ......... ......................... 84
Warning message ................. 376
Water release ....................... 173
Fuel consumption............ 111, 112
Fuel door .................................. 198 Refueling............................... 198
Fuses ........................................ 355
Garage door opener ................ 292
Gauges ..................................... 102
Glove box ................................. 271
Grocery bag hooks .................. 275 H
2O switch ............................... 173
Hands-free system
(for cellular phone)
*
Head restraints ........................ 145
Headlights ................................ 187 Automatic High Beam system .......... ...................... 190
Light switch ........................... 187
Replacing light bulbs ............ 358
Heated steering wheel ............ 265
Heaters Automatic air conditioning system .......... ...................... 256
Heated steering wheel .......... 265
Outside rear view mirrors ..... 259
Seat heaters ......................... 266
High mounted stoplight
Replacing light bulbs ............ 358
High-voltage components ........ 83
Hill-start assist control ........... 231
Hood ......................................... 320 Warning message................. 376
Hooks
Coat hooks ........................... 279
Grocery bag hooks ............... 275
Retaining hooks (floor mat) .... 26
Horn .......................................... 147
Hydrogen detectors .................. 87
Hydrogen-related components............................. 82
Hydrogen tanks ......................... 86 Capacity................................ 418
Location ............................ 78, 82
G
H