2020 TOYOTA MIRAI Owners Manual (in English)

4178-2. Steps to take in an emergency
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When trouble arises
If you think something is wrong
●Fluid leaks un der the vehicle.
(Water dripping from the air conditioning a fter use is normal.)
● Flat-looking tires or uneven tire wear
● The high coolant temperature war ning light flashes or comes on
● Excessive tire squeal when cornering
● Strange noises related to the suspension system
● Pinging or other noises rel ated to the fuel cell system
● Stumbling or running roughly
● Appreciable loss of power
● Vehicle pulls heavily to one side when braking
● Vehicle pulls heavily to one s ide when driving on a level road
● Loss of brake effectiveness, spongy feeling, pedal almost touch es
the floor
If you notice any of the followi ng symptoms, your vehicle proba -
bly needs adjustment or repair. Contact your Toyota dealer as
soon as possible.
Visible symptoms
Audible symptoms
Operational symptoms

4188-2. Steps to take in an emergency
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If a warning light turns on or a war ning
buzzer sounds
Calmly perform the following actions if any of the warning ligh ts
comes on or flashes. If a light comes on or flashes, but then
goes off, this does not necessarily indicate a malfunction in the
system. However, if this continues to occur, have the vehicle
inspected by your Toyota dealer.
Warning light and w arning buzzer list
Warning lightWarning light/Details/Actions
Hydrogen leak warning light (warning buzzer)
When a hydrogen gas leak is detected, a buzzer sounds,
a light comes on, and a warning message is displayed on
the multi-information display.
 P. 93
(U.S.A.)
(Red)
(Canada)
Brake system warning li ght (warning buzzer)*1
Indicates that:
• The brake fluid level is low; or
• The brake system is malfunctioning
 Immediately stop the vehicle in a safe place and con-
tact your Toyota dealer. Continuing to drive the vehi-
cle may be dangerous.
Charging system warning light
Indicates a malfunction in the vehicle’s charging system
 Immediately stop the vehicle in a safe place and con-
tact your Toyota dealer.
High coolant temperature warning light
Indicates that the coolant temperature is abnormal
P. 457
 Immediately stop the vehicle in a safe place and con-
tact your Toyota dealer.
(Yellow)
Brake system warning light
Indicates a malfunction in:
• The regenerative braking system; or
• The electronically controlled brake system
 Have the vehicle inspected by your Toyota dealer
immediately.

4198-2. Steps to take in an emergency
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When trouble arises
SRS warning lightIndicates a malfunction in:
• The SRS airbag system;
• The front passenger occupant classification system; or
• The seat belt pretensioner system
 Have the vehicle inspected by your Toyota dealer
immediately.
(U.S.A.)
(Canada)
ABS warning light Indicates a malfunction in:
• The ABS; or
• The brake assist system
 Have the vehicle inspected by your Toyota dealer
immediately.
(Red/Yellow)
Electric power steering system warning light (warning
buzzer)
Indicates a malfunction in the EPS (Electric Power Steer-
ing) system
 Have the vehicle inspected by your Toyota dealer
immediately.
(Yellow)
LDA indicator (warning buzzer)
Indicates a malfunction in the LDA (Lane Departure Alert)
 Follow the instructions dis played on the multi-infor-
mation display. (
P. 247)
(Flashes)
PKSB OFF indicator (warning buzzer) When a buzzer sounds:
Indicates a malfunction in the Parking Support Brake func-
tion (for static objects)
 Have the vehicle inspected by your Toyota dealer
immediately.
When a buzzer does not sound:
Indicates that the system is temporarily unavailable, possi-
bly due to a sensor being dirty or covered with ice, etc.
 Clear the dirt, etc.
When removing and installing the 12-volt battery, the sys-
tem needs to be initialized.
 P. 283
Warning lightWarning light/Details/Actions

4208-2. Steps to take in an emergency
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(Flashes or
illuminates)
PCS warning light
When a buzzer sounds simultaneously:
Indicates a malfunction has occurred in the PCS (Pre-Col-
lision System).
 Have the vehicle inspected by your Toyota dealer
immediately.
When a buzzer does not sound:
The PCS (Pre-Collision System) has become temporarily
unavailable, corrective action may be necessary.
 Follow the instructions dis played on the multi-infor-
mation display. (
P. 224, 426)
If the PCS (Pre-Collision System) or VSC (Vehicle Stability
Control) system is disabled, the PCS warning light will illu-
minate.
 P. 237
Slip indicator
Indicates a malfunction in:
• The VSC system;
• The TRAC system; or
• The hill-start assist control system
The light will flash when the ABS, VSC or TRAC
system is
operating.
 Have the vehicle inspected by your Toyota dealer
immediately.
(U.S.A.)
(Canada)
Parking brake warning light (warning buzzer)*2
Parking brake has not been fully released
 Operate the parking brake once again.
If the light turns off after the parking brake is fully release d,
the system is operating normally.
Open door warning light (warning buzzer)*3
Indicates that a door or the trunk is not fully closed
 Check that all the doors and the trunk are closed.
Low fuel level warning light
Indicates that remaining fuel is approximately 2.4 lb.
(1.1 kg) or less
 Refuel the vehicle.
Warning lightWarning light/Details/Actions

4218-2. Steps to take in an emergency
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When trouble arises
*1: Brake warning buzzer: When there is a malfunction that leads to a decline in the brak e effective-
ness, a buzzer sounds while at the same time a warning light co mes on.
*2: Parking brake engaged warning buzzer:
P. 200
*3: Open door warning buzzer:
A buzzer will sound if the vehicle reaches a speed of 3 mph (5 km/h) or
more with any door open.
Driver’s and front passenger’ s seat belt reminder light
(warning buzzer)
*4
Warns the driver and/or front passenger to fasten their
seat belts
 Fasten the seat belt.
If the front passenger’s seat is occupied, the front
passenger’s seat belt also needs to be fastened to
make the warning light (warning buzzer) turn off.
Master warning light
A buzzer sounds and the warning light comes on and
flashes to indicate that the master warning system has
detected a malfunction.
 P. 426
Tire pressure warning light
Indicates low tire pressure due to one of the following:
• Flat tire
• Natural causes
• The tire pressure warning system is malfunctioning
 Immediately stop the veh icle in a safe place.
Handling method ( P. 4 2 3 )
Brake Override System/Drive-St art Control/Parking Sup-
port Brake function (for st atic objects) (if equipped)
*5
Indicates that:
• The Brake Override System is operating;
• The Brake Override System is malfunctioning (with
warning buzzer);
• The Drive-Start Control is operating (with warning buzzer);
• The Drive-Start Control is malfunctioning (with warning buzzer); or
• The Parking Support Brake function (for static objects)
(if equipped) is operating (with warning buzzer)
(P. 279)
 Follow the instruction that are displayed on the multi-
information display.
Warning lightWarning light/Details/Actions

4228-2. Steps to take in an emergency
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*4: Driver’s and front passenger’s seat belt warning buzzer:The driver’s seat belt warning buzzer sounds to alert the drive r that his or
her seat belt is not fastened. Once the power switch is turned to ON mode,
the buzzer sounds for 6 seconds. If the vehicle reaches a speed of 12 mph
(20 km/h), the buzzer sounds once. If the seat belt is still unfastened after
24 seconds, the buzzer will sound intermittently for 10 seconds . Then, if
the seat belt is still unfastened, the buzzer will sound in a d ifferent tone for
20 more seconds.
The front passenger’s seat belt warning buzzer sounds to alert the front
passenger that his or her seat belt is not fastened. The buzzer sounds
once if the vehicle reaches a speed of 12 mph (20 km/h). If the seat belt is
still unfastened after 24 seconds, the buzzer will sound intermittently for
10 seconds. Then, if the seat belt is still unfastened, the buzzer will sound
in a different tone for 20 more seconds.
*5: This light illuminates on the multi-information display.

4238-2. Steps to take in an emergency
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When trouble arises
■SRS warning light
This warning light system monitors the airbag sensor assembly, front impact
sensors, side impact sensors (front door), side impact sensors (front), side
impact sensors (rear), driver’s seat position sensor, driver’s seat belt buckle
switch, front passenger occupant classification system (ECU and sensors),
“AIR BAG ON” indicator light, “AIR BAG OFF” indicator light, fr ont passen-
ger’s seat belt buckle switch, seat belt pretensioners, airbags , interconnect-
ing wiring and power sources. ( P. 38)
■ Front passenger detection sensor, seat belt reminder and warnin g
buzzer
● If luggage is placed on the front passenger seat, the front pas senger detec-
tion sensor may cause the warning light to flash and the warnin g buzzer to
sound even if a passenger is not sitting in the seat.
● If a cushion is placed on the seat, the sensor may not detect a passenger,
and the warning light may not operate properly.
■ Electric power steering system wa rning light (warning buzzer)
When the 12-volt battery charge becomes insufficient or the vol tage tempo-
rarily drops, the electric power steering system warning light may come on
and the warning buzzer may sound.
■
When the tire pressure warning light comes on
Inspect the appearance of the ti re to check that the tire is not punctured.
If the tire is punctured: P. 432
If the tire is not punctured:
After turning the power switch t o off, turn it to ON mode again and make
sure the tire pressure warning light comes on or blinks.
The tire pressure warning light comes on
After the temperature of the tires have lowered sufficiently, c heck the
tire inflation pressure and ad just it to the specified level.
If the warning light does not go out even after several minutes , check
that the tire inflation pressu re is at the specified level.
If the warning light does not go out even after several minutes, have the
vehicle inspected by your Toyota dealer immediately.
The tire pressure warning light is blinking for 1 minute, and t hen comes
on
Malfunction in the tire pressure warning system. Have the syste m
checked by your Toyota dealer immediately.
■The tire pressure warning light may come on due to natural caus es
The tire pressure warning light may come on due to natural caus es such
as natural air leaks and tire inflation pressure changes caused by tem-
perature. In this case, adjusting the tire inflation pressure w ill turn off the
warning light (afte r a few minutes).
■Conditions that the tire pressure warning system may not functi on
properly
 P. 3 8 2
1
2

4248-2. Steps to take in an emergency
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Warning buzzer
In some cases, the buzzer may not be heard due to being in a no isy location
or audio sound.
WARNING
■ If both the ABS and the brake s ystem warning lights remain on
Stop your vehicle in a safe place immediately and contact your To y o t a
dealer. The vehicle will become extremely unstable during braki ng, and the
ABS system may fail, which could cause an accident resulting in death or
serious injury.
■ When the electric power steering system warning light comes on
When the light comes on yellow, the assist to the power steerin g is
restricted. When the light comes on red, the assist to the powe r steering is
lost and handling operations of the steering wheel become extre mely
heavy. When steering wheel operations are heavier than usual, g rip the
steering wheel firmly and operate it using more force than usua l.
■
If the tire pressure warning light comes on
Handling method ( P. 4 2 3 )
Be sure to observe the following precautions. Failure to do so could
cause a loss of vehicle control and result in death or serious injury.
●Stop your vehicle in a safe place as soon as possible. Adjust t he tire
inflation pressure immediately.
●If the tire pressure warning light comes on even after tire inf lation pres-
sure adjustment, it is probable that you have a flat tire. Chec k the tires.
If a tire is flat, repair the fla t tire by using emergency tire puncture
repair kit.
●Avoid abrupt maneuvering and braking. If the vehicle tires dete riorate,
you could lose control of the steering wheel or the brakes.
■If a blowout or sudden air leakage should occur
The tire pressure warning system may not activate immediately.