2023 TOYOTA MIRAI auxiliary battery

762-1. Fuel cell electric vehicle
Owners Manual_USA_M62064_en
2-1.Fuel cell electric vehicle
The illustration is an example for explanation and may differ from the actual
item.
Fuel cell stack
Fuel cell converter and auxiliary inverter
Hydrogen tanks
Traction battery
Fuel cell electric ve hicle characteristics
Fuel cell electric vehicle efficiently use electricity, which i s
generated by a chemical reaction between hydrogen and oxy-
gen in a fuel cell stack, and electricity charged in a traction
battery to drive the electric motor (traction motor).
The fuel is H2 (compressed hydrogen gas), so the exhaust is
only water and water vapor. As they do not release emissions
such as CO
2 (Carbon Dioxide) and NOx (Nitrogen Oxides),
fuel cell electric vehicles are environmentally friendly vehi-
cles.
Fuel cell electric vehicle components

822-1. Fuel cell electric vehicle
Owners Manual_USA_M62064_en
■High-voltage and high-temperature components
The fuel cell electric vehicle has high-voltage components (abo ut
650 V maximum) such as a fuel c ell stack, traction battery, power
control unit, fuel cell converter, high-voltage cables (which a re distin-
guished from low-voltage cables b y their orange covers), electric
motor (traction motor), etc., and high-temperature parts such a s the
radiator for cooling. Pay attention to all warning labels attached to
the vehicle.
This diagram is for illustrative purposes only and may differ f rom the actual
vehicle.
Warning label
Radiator for inverter cooling
Radiator for fuel cell stack cooling
Fuel cell water pump
Fuel cell converter and auxiliary inverter
Power control unit
Cabin coolant heater
Traction battery
Service plug

4668-2. Steps to take in an emergency
Owners Manual_USA_M62064_en
■If a message that indicates the
need for visiting your Toyota
dealer is displayed
The system or part shown on the
multi-information display is malfunc-
tioning. Have the vehicle inspected
by your Toyota dealer immediately.
■If a message that indicates the
need for referring to Owner’s
Manual is displayed
●If any of the following messages
are shown on the multi-informa-
tion display, it may indicate a mal-
function. Have the vehicle
inspected by you r Toyota dealer
immediately.
• “Smart Key System Malfunction
See Owner’s Manual”
• “P Switch Malfunction Apply Park- ing Brake Securely When Parking
See Owner’s Manual”
• “Shift System Malfunction Apply Parking Brake Securely When
Parking See Owner’s Manual”
• “Shift System Unavailable Apply Parking Brake Securely When
Parking See Owner’s Manual”
• “Shift System Malfunction See Owner’s Manual”
• “Shift System Malfunction Stop in a Safe Place See Owner’s Man-
ual”
• “Battery Low Shifting Unavailable See Owner’s Manual”
• “FCV system malfunction”
• “Traction battery system malfunc-
tion”
• “Accelerator System Malfunction”
●If any of the following messages
are shown on the multi-informa-
tion display, it may indicate a mal-
function. Immediat ely stop the
vehicle and contact your Toyota
dealer.
• “Braking Power Low Stop in a Safe Place See Owner’s Manual”
• “FCV System Shutdown Due to
Hydrogen Leakage Stop in a Safe
Place See Owner’s Manual”
●If “FCV system stopped” is shown
on the multi-information display,
the vehicle may have run out of fuel. Stop the vehicle in a safe
place and, if the fuel level is low,
refuel the vehicle. (
P.83)
●If “Low Auxiliary Battery See
Owner’s Manual” is shown,
• When the display goes off after several seconds (displays for
about 6 seconds): Maintain the
fuel cell system operation for more
than 15 minutes and charge the
12-volt battery.
• When the display does not go off: Start up the fuel cell system using
the procedures: P. 4 8 5
●If “Maintenance Required for Trac-
tion Battery Cooling Parts See
Owner’s Manual” is shown, the fil-
ters may be clogged, the air intake
vents may be blocked, or there
may be a gap in the duct. There-
fore, perform the following correc-
tion procedure.
• Cleaning the traction battery air intake vents ( P.433)
If the warning message is shown
even if the vents are cleaned,
have the vehicle inspected by
your Toyota dealer.
■If “Ion Filter Maintenance
Required Visit Your Dealer” is
displayed
Ion filter replacement is necessary.
Contact your Toyota dealer.
NOTICE
■If “Low Auxiliary Battery See
Owner’s Manual” is displayed
frequently
The 12-volt battery may have
deteriorated. As the battery may
discharge in this state when left
unattended, have the battery
inspected by you r Toyota dealer.

544Alphabetical Index
Owners Manual_USA_M62064_en
Auxiliary boxes ....................... 360
Average fuel economy ........... 107
Average vehicle speed........... 111
B
Back-up lights Replacing light bulbs ............ 443
Battery (12-volt battery) ......... 413 Battery checking................... 413
If the 12-volt battery is dis-charged .............................. 485
Preparing and c hecking before
winter.................................. 327
Warning light ........................ 455
Battery (traction battery) ......... 81
Blind Spot Monitor (BSM) ...... 256 Enabling/disabling the system........................................... 258
Brake Brake hold ............................ 194
Fluid ............................. 412, 500
Parking brake ....................... 191
Warning light ........................ 454
Brake assist ............................ 322
Break-in tips ........ ................... 170
Brightness control Instrument panel light control................................... 100, 104
BSM (Blind Spot Monitor) ...... 256 Enabling/disabling the system........................................... 258
Buzzer Hands off steering wheel warn-ing (LTA) ............................. 239
Vehicle sway warning function (LTA) ................................... 240
C
Camera Front camera ........................214
Rear camera.........................278
Toyota Teammate Advanced Park ....................................297
Care..................................392, 396 Aluminum wheel ornaments .392
Aluminum wheels .................392
Exterior .................................392
Interior ..................................396
Roof film ...............................393
Seat belts .............................396
Traction battery air intake vents...........................................433
Cargo and luggage .................175
Cargo capacity ........................178
Chains......................................329
Child restraint system ..............52 Fixed with a LATCH system ...60
Fixed with a seat belt..............56
Front passenger occupant clas-sification system ...................46
Points to remember ................52
Riding with children ................51
Types of child restraint system installation method ...............54
Using an anchor bracket ........62
Child safety ...............................51 12-volt battery precautions .414, 488
Airbag precautions .................39
Child restraint system .............54
Electronic sunshade .............364
Heated steering wheel and seat heater precautio ns..............351
How your child should wear the seat belt ................................30
Power window lock switch ....164
Power window precautions...163
Rear door child-protectors ....130

Owners Manual_USA_M62064_en
Alphabetical Index549
Instrument panel light control
....................................... 100, 104
Interior lights .......................... 355
Intuitive parking assist .......... 261 Enabling/disabling the system........................................... 262
Function ............................... 261
Warning lights....................... 457
Warning message ................ 263
Inverter coolant ...................... 410 Checking .............................. 410
Ion filter ..................................... 84
J
Jack Positioning a floor jack ......... 406
Jam protection function Power windows .................... 162
K
Keyless entrySmart key system................. 136
Wireless remote control ....... 125
Keys ......................................... 124 Battery-saving function......... 137
Electronic key ....................... 124
If the electronic key does not operate properly ................. 482
If you lose your keys ............ 481
Key number plate ................. 124
Keyless entry................ 127, 136
Mechanical key .................... 124
Power switch ........................ 180
Replacing the battery ........... 436
Warning buzzer .................... 136
Wireless remote control ....... 125
Knee airbags ............................. 34
L
Lane Tracing Assist (LTA) ......230 Operation..............................230
Warning lights .......................457
Warning messages ...............240
Language (multi-information dis- play) ....................................... 111
LATCH anchors.........................60
Lever Auxiliary catch lever .............406
Hood lock release lever ........406
Internal trunk rele ase lever ...134
Shift lever .............................185
Turn signal lever ...................190
Wiper lever ...........................204
License plate lights Light switch...........................198
Replacing light bulbs ............443
Light bulbs Replacing .............................443
Lights Automatic High Be am ...........200
Front personal lights .............356
Headlight switch ...................198
Interior lights .................355, 356
Interior lights list ...................355
Rear personal lights .............356
Replacing light bulbs ............443
Trunk light .............................134
Turn signal lever ...................190
Vanity lights ..........................380
LTA (Lane Tracing Assist) ......230 Operation..............................230
Warning lights .......................457
Warning messages ...............240
Luggage mats .........................361