key TOYOTA MIRAI 2018 (in English) Repair Manual

446What to do if... (Troubleshooting)
MIRAI_OM_USA_OM62025U
What to do if... (Troubleshooting)
●If you lose your mechanical keys, new genuine mechanical keys can be
made by your Toyota dealer. ( P. 117)
●If you lose your electronic keys, the risk of vehicle theft inc reases signifi-
cantly. Contact your Toyota dealer immediately. ( P. 119)
●Is the key battery weak or depleted? (P. 353)
●Is the power switch in ON mode?
When locking the doors, turn the power switch off. ( P. 174)
●Is the electronic key left inside the vehicle?
When locking the doors, make sure that you have the electronic key on
your person.
●The function may not operate properly due to the condition of t he radio
wave. ( P. 134)
●Is the child-protector lock set?
The rear door cannot be opened from inside the vehicle when the lock is
set. Open the rear door from outside and then unlock the child-protector
lock. ( P. 123)
●The function to prevent the electronic key from being left insi de the trunk
will operate and you can open the trunk as usual. Take the key out from the
trunk. ( P. 128)
If you have a problem, check the following before contacting
your Toyota dealer.
The doors cannot be locked, unlocked, opened or closed
You lose your keys
The doors cannot be locked or unlocked
The rear door cannot be opened
The trunk lid is closed with t he electronic key left inside

447What to do if... (Troubleshooting)
MIRAI_OM_USA_OM62025U
●Did you press the power switch while firmly depressing the brake pedal?
( P. 172)
●Is the shift position in P? ( P. 180)
●Is the electronic key anywhere detectable inside the vehicle? ( P. 132)
●Is the electronic key battery weak or depleted?
In this case, the fuel cell system can be started in a temporary way.
( P. 399)
●Is the 12-volt battery discharged? ( P. 401)
●Is the window lock switch pressed?
The power window except for the one at the driver’s seat cannot be oper-
ated if the window lock switch is pressed. ( P. 154)
●The auto power off function will be operated if the vehicle is left in ACCES-
SORY or ON mode (the fuel cell system is not operating) for a p eriod of
time. ( P. 174)
If you think something is wrong
The fuel cell syst em does not start
The windows do not open or close by operating the power
window switches
The power switch is turned off automatically

448What to do if... (Troubleshooting)
MIRAI_OM_USA_OM62025U
●The seat belt reminder light is flashing
Are the driver and the front passenger wearing the seat belts? (P. 371)
●The brake system warning light is on
Is the parking brake released? ( P. 186)
Depending on the situation, other types of warning buzzer may a lso sound.
( P. 369, 376)
●Did anyone inside the vehicle open a door during setting the al arm?
The sensor detects it and the alarm sounds. ( P. 74)
To stop the alarm, turn the power switch to ON mode or start the fuel cell sys-
tem.

●Is the electronic key left inside the vehicle?
Check the message on the multi-information display. ( P. 376)
●When a warning light turns on or a warning message or indicator is dis-
played, refer to P. 369, 376.
●Stop the vehicle in a safe place and replace the flat tire with the spare
tire. ( P. 381)
●Try the procedure for when the vehicle becomes stuck in mud, di rt, or
snow. ( P. 412)
A warning buzzer sounds during driving
A warning buzzer sounds w hen leaving the vehicle
An alarm is activated and the horn sounds
A warning light turns on or a warning message or indicator
is displayed
When a problem has occurred If you have a flat tire
The vehicle becomes stuck

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”.

450Alphabetical index
MIRAI_OM_USA_OM62025U
Back-up lightsReplacing light bulb .............. 358
Battery (12-volt battery) .......... 328 Battery checking ................... 328
If the 12-volt battery is discharged .......................... 401
Preparing and checking before winter....................... 252
Warning message ................. 376
Battery (traction battery)..... 78, 83 Air intake vent ......................... 85
Charging ................................. 81
Location ............................ 78, 83
Warning message ................. 376
Blind Spot Monitor (BSM) ....... 244 Blind Spot Monitor function ... 246
Rear Crossing Traffic Alert function ............................... 250
Bluetooth
®*
Audio system*
Hands-free system (for cellular phone)
*
Navigation system*
Bottle holders .......................... 274
Brake Fluid ...................................... 420
Parking brake........................ 186
Regenerative braking.............. 81
Warning light ......................... 369
Brake assist ............................. 231
Break-in tips ............................ 160
Brightness control Instrument panel light
control................................. 104
BSM (Blind Spot Monitor) ....... 244 Blind Spot Monitor function ... 246
Rear Cross Traffic Alert
function ............................... 249 Care .................................. 306, 310
Aluminum wheels ................. 307
Exterior ................................. 306
Interior .................................. 310
Seat belts.............................. 311
Cargo capacity......................... 169
CD player
*
Chains ...................................... 253
Child restraint system............... 56 Booster seats installation........ 64
Convertible seats installation ............................ 63
Front passenger occupant classification syst em ............ 49
Infant seats definition.............. 58
Infant seats installation ........... 62
Installing a CRS to the passenger seat..................... 59
Installing CRS with LATCH anchors ................................ 67
Installing CRS with seat belts...................................... 62
Installing CRS with top tether
strap ..................................... 69
Child safety ................................ 55 12-volt battery precautions................. 330, 405
Airbag precautions.................. 39
Child restraint system ............. 56
How your child should wear the seat belt.......................... 32
Power window lock switch .... 154
Power window precautions ... 156
Rear door child-protectors .... 123
Removed electronic key battery precautions............. 354
Seat belt extender precautions........................... 35
Seat belt precautions .............. 34
Seat heater precautions ....... 265
Trunk precautions ................. 129
BC

451Alphabetical index
MIRAI_OM_USA_OM62025U
Child-protectors....................... 123
Cleaning ........................... 306, 310Aluminum wheels.................. 307
Exterior ................................. 306
Interior................................... 310
Seat belts .............................. 311
Clock ......................................... 278
Coat hooks ............................... 279
Condenser ................................ 325
Console box ............................. 271
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.............................. 272
Curtain shield airbags ............... 37
Customizable features ............ 434
Daytime running light system .................................... 188
Defogger Outside rear view mirrors...... 259
Rear window ......................... 259
Windshield ............................ 259
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 ................................ 267
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”.

452Alphabetical index
MIRAI_OM_USA_OM62025U
DrivingBreak-in tips .......................... 160
Correct driving posture ........... 28
Driving advice ......................... 94
Fuel cell vehicle driving
tips ........................................ 94
Procedures ........................... 158
Winter drive tips .................... 252
Driving position memory ........ 140 Memory recall function.......... 142
Dynamic radar cruise
control .................................... 203
ECB (Electronically Controlled Brake System) ...................... 231
Eco drive mode ........................ 181
EDR (Event data recorder) .......... 9
Electric motor (traction motor) Location ............................ 78, 83
Specification ......................... 418
Electric Power Steering (EPS)....................................... 232
Function ................................ 232
Warning light ......................... 370
Electronic key Battery-saving function ......... 133
If the electronic key does not
operate properly ................. 398
Replacing the battery ............ 353
Electronically Controlled Brake System (ECB) ............. 231
Emergency flashers ................ 360 Emergency, in case of
If a warning buzzer sounds... 369
If a warning light turns on ..... 369
If a warning message is displayed ............................ 376
If the 12-volt battery is discharged.......................... 401
If the electronic key does not
operate properly ................. 398
If the fuel cell system will not start ........................ 396
If you have a flat tire ............. 381
If you lose your keys ..... 117, 119
If you think something is wrong ................................. 368
If your vehicle becomes stuck ................................... 412
If your vehicle has to be stopped in an emergency ... 361
If your vehicle needs to be
towed.................................. 362
If your vehicle overheats....... 406
Emergency shut off system ..... 84
Emergency tire puncture
repair kit ................................. 381
Energy monitor ........................ 108
Enhanced VSC ......................... 231
EPS (Electric Power Steering) ..... 232 Function ................................ 232
Warning light......................... 370
Event data recorder (EDR).......... 9
E

455Alphabetical index
MIRAI_OM_USA_OM62025U
IdentificationVehicle .................................. 417
Illuminated entry system ........ 269
Immobilizer system ................... 72
Indicators ................................. 100
Initialization Ion filter ................................. 439
Power windows ..................... 155
Inside rear view mirror ............ 149
Instrument panel light control .................................... 104
Interior lights............................ 267 Switch ................................... 268
Wattage ................................ 421
Intuitive parking assist............ 223
Inverter coolant Capacity ................................ 419
Checking ............................... 324
Ion filter ...................................... 87 Jack
Positioning a floor jack.......... 321
Vehicle-equipped
jack ............................. 339, 383
Jack handle ...................... 339, 383
Jam protection function
Power window ...................... 155
Keyless entry Smart key system ......... 120, 126
Wireless remote
control ........................ 120, 126
Keys .......................................... 116
Battery-saving function ......... 133
Electronic key ....................... 116
If the electronic key does not operate properly ................. 398
If you lose your keys ..... 117, 119
Key number plate ................. 116
Keyless entry ................ 120, 126
Mechanical key ..................... 117
Power switch ........................ 172
Replacing the battery............ 353
Warning buzzer .................... 132
Wireless remote control ........ 116
Knee airbags .............................. 36
IJ
K
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL”.

458Alphabetical index
MIRAI_OM_USA_OM62025U
Radar cruise control (dynamic radar cruise control) ............. 203
Radiator .................................... 325
Radio
*
Rear Crossing Traffic Alert ..... 244
Rear interior lights................... 268 Wattage ................................ 421
Rear side marker lights ........... 187
Light switch ........................... 187
Replacing light bulbs............. 358
Rear turn signal lights............. 185
Replacing light bulbs............. 358
Turn signal lever ................... 185
Rear view mirror
Inside rear view mirror .......... 149
Outside rear view mirrors...... 151
Rear view monitor system
*
Rear window defogger ............ 259
Refueling .................................. 198 Capacity ................................ 418
Fuel types ............................. 418
Opening the fuel door ........... 200
Regenerative braking ................ 81
Replacing
Electronic key battery ........... 353
Fuses .................................... 355
Light bulbs ............................ 358
Tires ...................................... 339
Reporting safety defects for U.S. owners ...................... 444
Road accident cautions ............ 92 Safety Connect ........................ 299
Seat belt reminder light .......... 371
Seat belts ................................... 30
Adjusting the seat belt ............ 31
Automatic Locking Retractor (ALR) .................... 32
Child restra int system
installation ............................ 56
Cleaning and maintaining the seat belt........................ 311
Emergency Locking Retractor
(ELR) .................................... 32
How to wear your seat belt ..... 30
How your child should wear the seat belt.......................... 32
Pregnant women, proper seat belt use ......................... 33
Reminder light and buzzer.... 371
Seat belt extender .................. 32
Seat belt pretensioners........... 31
SRS warning light ................. 370
Seat heaters ............................. 266
Seat position memory ............. 140
Seating capacity ...................... 169
RS

459Alphabetical index
MIRAI_OM_USA_OM62025U
SeatsAdjustment ............................ 138
Adjustment precautions ........ 139
Child seats/child restraint system installation . ............... 56
Cleaning................................ 310
Driving position memory ....... 140
Head restraints ..................... 145
Power easy access system ......... ....................... 140
Properly sitting in the seat ...... 28
Seat heaters ......................... 266
Sensor Automatic headlight
system ......... ....................... 188
Automatic High Beam system ......... ....................... 194
Humidity sensor .................... 264
Inside rear view mirror .......... 150
Intuitive parking assist .......... 223
Radar sensor ................ 211, 239
Rain-sensing windshield wipers ................................. 196
Service plug ............................... 83
Shift lever ................................. 179
Side airbags ............................... 37
Side marker lights ................... 187 Light switch ........................... 187
Replacing light bulbs............. 358 Side mirrors ............................. 151
Adjusting and folding ............ 151
BSM (Blind Spot Monitor) ..... 244
Heaters ................................. 259
Side turn signal lights ............. 185
Replacing light bulbs ............ 358
Turn signal lever ................... 185
Smart key system .................... 131
Antenna location ................... 131
Entry functions .............. 120, 126
Starting the fuel cell system .......... ...................... 172
Warning message................. 376
Snow tires ................................ 252
Specifications .......................... 416
Speech command system
*
Speedometer............................ 102
Steering wheel ......................... 147
Adjustment............................ 147
Audio switches
*
Heated steering wheel .......... 265
Meter control switches .......... 104
Power easy access system .......... ...................... 140
Telephone switches
*
Stop lights Replacing light bulbs ............ 358
Storage feature ........................ 270
Stuck If the vehicle becomes
stuck ................................... 412
Sun visors ................................ 277
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL”.