TOYOTA PRIUS PLUG-IN HYBRID 2022 Owners Manual

6598-2. Steps to take in an emergency
Prius Plug-in Hybrid_OM_OM47E75E_(EE)
8
When trouble arises
(Flashes or illuminates)
PCS warning light
• When a buzzer sounds simultaneously:
Indicates a malfunction has occurred in the PCS (Pre-
Collision System).
 Have the vehicle inspected by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable
repairer immediately.
• When a buzzer does not sound:
The PCS (Pre-Collision System) has become temporar-
ily unavailable, corrective action may be necessary.
 Follow the instructions displayed on the multi-infor-
mation display. ( P. 366, 665)
If the PCS (Pre-Collision System) or VSC (Vehicle Stability
Control) system is disabled, the PCS warning light will illu-
minate.
 P. 378
(Orange)
LTA indicator (warning buzzer)
Indicates a malfunction in the LTA (Lane Tracing Assist)
 Follow the instructions displayed on the multi-infor-
mation display. ( P. 394)
Slip indicator light
Indicates a malfunction in:
• The VSC system;
• The TRC system; or
• The hill-start assist control system
 Have the vehicle inspected by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable
repairer immediately.
The light will flash when the ABS, VSC or TRC system is
operating.
High coolant temperature warning light
• When the light flashes:
Indicates that the engine coolant temperature is too high
The light changes from a flashing to a solid light when
the temperature further increases
 Immediately stop the vehicle in a safe place.
( P. 703)
• When the light comes on without flashing:
Indicates a malfunction in the exhaust heat recirculator
system
 Have the vehicle inspected by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable
repairer immediately.
Warning lightWarning light/Details/Actions

6608-2. Steps to take in an emergency
Prius Plug-in Hybrid_OM_OM47E75E_(EE)
(Flashes) (If equipped)
PKSB OFF indicator
Indicates a malfunction in the Parking Support Brake func-
tion
 Have the vehicle inspected by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable
repairer.
The warning light will operate as follows, even when the
system is not malfunctioning:
• The light will come on when the Parking Support Brake
function is turned off ( P. 464)
• The light will come on when the Parking Support Brake
function is operating ( P. 468)
• The light will flash when the system cannot temporarily
be used ( P. 470)
Open door warning light (warning buzzer)*3
Indicates that a door is not fully closed
 Check that all the doors are closed.
Low fuel level warning light
Indicates that remaining fuel is approximately 6.4 L
(1.7 gal., 1.4 Imp.gal.) or less
 Refuel the vehicle.
Driver’s and front passenger’s seat belt reminder light
(warning buzzer)*4
Warns the driver and/or fr ont 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.
Rear passengers’ seat belt reminder light (warning
buzzer)*5
Warns the rear passengers to fasten their seat belts
 Fasten the seat belt.
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. 665
Warning lightWarning light/Details/Actions

6618-2. Steps to take in an emergency
Prius Plug-in Hybrid_OM_OM47E75E_(EE)
8
When trouble arises
Tire pressure warning light
When the light comes on:
Low tire inflation pressure such as
• Natural causes ( P. 663)
• Flat tire ( P. 673)
 Adjust the tire inflation pressure to the specified
level.
The light will turn off after a few minutes. In case the
light does not turn off even if the tire inflation pres-
sure is adjusted, have the system checked by any
authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer.
When the light comes on after blinking for 1 minute:
Malfunction in the tire pressure warning system ( P. 663)
 Have the system checked by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable
repairer.
Inappropriate pedal operation warning light*6 (warning
buzzer)
When a buzzer sounds:
Indicates a malfunction in:
• The Brake Override System
• The Drive-Start Control
 Have the vehicle inspected by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable
repairer.
Indicates that the shift position was changed and Drive-
Start Control was operated while depressing the accelera-
tor pedal.
 Momentarily release the accelerator pedal.
Indicates that the Parking Support Brake function (if
equipped) is operating ( P. 468)
 Follow the instruction that is displayed on the multi-
information display.
When a buzzer does not sound:
Indicates that the accelerator and brake pedals are being
depressed simultaneously, and the Brake Override Sys-
tem is operating.
 Release the accelerator pedal and depress the brake
pedal.
Warning lightWarning light/Details/Actions

6628-2. Steps to take in an emergency
Prius Plug-in Hybrid_OM_OM47E75E_(EE)
*1: Brake system warning buzzer:
When there is a possible problem that could affect braking perf ormance,
the warning light will come on and a warning buzzer will sound.
*2: Low engine oil pressure warning buzzer:
A buzzer also sounds continuously for approximately 30 seconds at maxi-
mum in addition to the low engine oil pressure warning light wh en the
“READY” indicator is illuminated.
*3: Open door warning buzzer:
The open door warning buzzer sounds to alert one or more of the doors is
not fully closed (with the vehicle having reached a speed of 5 k m/h
[3 mph]).
*4: Driver’s and front passenger’s seat belt warning buzzer:
The driver’s and front passenger’s seat belt warning buzzer sou nds to alert
the driver and front passenger that his or her seat belt is not fastened. If
the seat belt is unfastened, the buzzer sounds intermittently f or a certain
period of time after the vehicle reaches a certain speed.
*5: Rear passengers’ seat belt warning buzzer:
The rear passengers’ seat belt warning buzzer sounds to alert t he rear
passenger that his or her seat belt is not fastened. If the sea t belt is unfas-
tened, the buzzer sounds intermittently for a certain period of time, after
the seat belt is fastened and unfastened and the vehicle reache s a certain
speed.
*6: This symbol is displayed on the multi-information display.
Q Front passenger detection sensor, seat belt reminder and warning
buzzer
O If luggage is placed on the front passenger seat, the front passenger 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.
O If a cushion is placed on the seat, the sensor may not detect a passenger,
and the warning light may not operate properly.
Q Electric power steering system warning 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.
Q If the malfunction indicator lamp comes on while driving
The malfunction indicator lamp will come on if the fuel tank be comes com-
pletely empty. If the fuel tank is empty, refuel the vehicle im mediately. The
malfunction indicator lamp will go off after several trips.
If the malfunction indicator lamp does not go off, contact any authorized
Toyota retailer or Toyota authorized repairer, or any reliable repairer as soon
as possible.

6638-2. Steps to take in an emergency
Prius Plug-in Hybrid_OM_OM47E75E_(EE)
8
When trouble arises
QWhen the tire pressure warning light comes on
Inspect the appearance of the tire to check that the tire is no t punctured.
If the tire is punctured: P. 673
If the tire is not punctured:
Carry out the following procedure after the tire temperature ha s lowered suffi-
ciently.
O Check the tire inflation pressure and adjust to the appropriate level.
O If the warning light does not go out even after several minutes, check that
the tire inflation pressure is at the specified level and carry out initialization.
( P. 602)
The warning light may come on again if the above operations are conducted
without first allowing the tire temperature to lower sufficient ly.
Q The tire pressure warning light may come on due to natural causes
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 temperature.
In this case, adjusting the tire inflation pressure will turn o ff the warning light
(after a few minutes).
Q Conditions that the tire pressure warning system may not function prop-
erly
 P. 604
Q If the tire pressure warning light frequently comes on after blinking for
1minute
If the tire pressure warning light frequently comes on after bl inking for
1 minute when the power switch is turned to ON mode, have it che cked by
any authorized Toyota retailer or Toyota authorized repairer, o r any reliable
repairer.
Q Warning buzzer
In some cases, the buzzer may not be heard due to being in a no isy location
or audio sound.

6648-2. Steps to take in an emergency
Prius Plug-in Hybrid_OM_OM47E75E_(EE)
WARNING
QWhen 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.
Q If the tire pressure warning light comes on
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.
O Stop your vehicle in a safe place as soon as possible. Adjust the tire infla-
tion pressure immediately.
O If the tire pressure warning light comes on even after tire inflation pressure
adjustment, it is probable that you have a flat tire. Check the tires. If a tire
is flat, repair the flat tire by using emergency tire puncture repair kit.
O Avoid abrupt maneuvering and braking. If the vehicle tires deteriorate, you
could lose control of the steering wheel or the brakes.
Q If a blowout or sudden air leakage should occur
The tire pressure warning system may not activate immediately.
NOTICE
Q To ensure the tire pressure warning system operates properly
Do not install tires with different specifications or makers, a s the tire pres-
sure warning system may not operate properly.

6658-2. Steps to take in an emergency
Prius Plug-in Hybrid_OM_OM47E75E_(EE)
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When trouble arises
If a war ning message is displayed
Master warning light
The master warning light also
comes on or flashes in order to
indicate that a message is cur-
rently being displayed on the multi-
information display.*
Multi-information display
Handling method
Follow the instructions of the mes-
sage on the multi-information dis-
play.
If any of the warning messages are shown again after the follow ing
actions have been performed, contact any authorized Toyota reta iler
or Toyota authorized repairer, or any reliable repairer.
*: The master warning light may not come on or flash when a warni ng mes-
sage is displayed.
The multi-information display shows warnings of system mal-
functions, incorrectly performed operations, and messages that
indicate a need for maintenance. When a message is shown,
perform the correction procedure appropriate to the message.
When a message about charging is displayed, refer to P. 187.
1
2
3

6668-2. Steps to take in an emergency
Prius Plug-in Hybrid_OM_OM47E75E_(EE)
The warning lights and warning buzzers operate as follows depending
on the content of the message. If a message indicates the need for
inspection by a dealer, have the vehicle inspected by any autho rized
Toyota retailer or Toyota authorized repairer, or any reliable repairer
immediately.
The operation of the warning lights and warning buzzers may dif fer
from those stated. In this case, perform the correction procedu re
according to the displayed message.
*: A buzzer sounds the first time a message is shown on the multi -informa-
tion display.
Messages and warnings
System
warning
light
Warning
buzzer*Warning
Comes onSounds
Indicates an important situation, such
as when a system related to driving is
malfunctioning or that danger may
result if the correction procedure is not
performed
Comes on
or flashesSounds
Indicates an important situation, such
as when the systems shown on the
multi-information display may be mal-
functioning
FlashesSounds
Indicates a situation, such as when
damage to the vehicle or danger may
result
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 performed incor-
rectly, or indicates how to perform an
operation correctly

6678-2. Steps to take in an emergency
Prius Plug-in Hybrid_OM_OM47E75E_(EE)
8
When trouble arises
QWarning messages
The warning messages explained below may differ from the actual messages
according to operation conditions and vehicle specifications.
Q System warning lights
The master warning light does not come on or flash in the follo wing cases.
Instead, a separate system warning light will come on along wit h a message
or image shown on the multi-information display.
O “Antilock Brake System Malfunction Visit Your Dealer”:
The ABS warning light comes on. ( P. 658)
O “Braking Power Low Visit Your Dealer”:
The brake system warning light (yellow) will come on. ( P. 657)
O Indicates that a door is not fully closed while the vehicle is stopped.:
The Open door warning light comes on. ( P. 6 6 0 )
Q If “Visit Your Dealer” is shown
The system or part shown on the multi-information display is ma lfunctioning.
Have the vehicle inspected by any authorized Toyota retailer or Toyota autho-
rized repairer, or any reliable repairer.
Q If a message about an operation is shown
O If a message about an operation of the accelerator pedal or brake pedal is
shown
• A warning message about an operation of the brake pedal may be shown
while the driving assist systems such as PCS (Pre-Collision Sys tem) or
the dynamic radar cruise control with full-speed range is opera ting. If a
warning message is shown, be sure to decelerate the vehicle or follow an
instruction shown on the multi-information display.
• A warning message is shown when Brake Override System operates .
( P. 310, 671)
• A warning message is shown when Drive-Start Control or Parking Sup-
port Brake function (if equipped) operates ( P. 310, 468). Follow the
instructions on the multi-information display.
O If a message about an operation of the power switch is shown
An instruction for operation of the power switch is shown when the incorrect
procedure for starting the hybrid system is performed or the po wer switch is
operated incorrectly. Follow the instructions shown on the mult i-information
display to operate the power switch again.
O If a message about a shift operation is shown
To prevent the shift position from being selected incorrectly o r the vehicle
from moving unexpectedly, the shift position may be changed aut omatically
( P. 331) or shift operation may be required. In this case, change the shift
position following the instructions on the multi-information di splay.

6688-2. Steps to take in an emergency
Prius Plug-in Hybrid_OM_OM47E75E_(EE)
O If a message or image about an open/close state of a part or replenishment
of a consumable is shown
Confirm the part indicated by the multi-information display or a warning light,
and then perform the coping method such as closing the open doo r or
replenishing a consumable.
Q If “See Owner’s Manual” is shown
O If “Braking Power Low Stop in a Safe Place See Owner’s Manual” is shown,
this may be a malfunction. Immediately stop the vehicle in a sa fe place and
contact any authorized Toyota retailer or Toyota authorized rep airer, or any
reliable repairer. Continuing to drive the vehicle may be dange rous.
O If “Engine Oil Pressure Low” is shown, this may be a malfunction. Immedi-
ately stop the vehicle in a safe place and contact any authoriz ed Toyota
retailer or Toyota authorized repairer, or any reliable repaire r.
O If the following messages are shown, there may be a malfunction. Immedi-
ately have the vehicle inspected by any authorized Toyota retai ler or Toyota
authorized repairer, or any reliable repairer.
• “Plug-in charging system malfunction.”
• “Hybrid System Malfunction”
• “Check Engine”
• “Hybrid Battery System Malfunction”
• “Accelerator System Malfunction”
• “Smart Entry & Start System Malfunction See Owner’s Manual”
O If “Exhaust Filter Full See Owner’s Manual” is shown on the multi-informa-
tion display is shown, follow the instruction. ( P. 5 0 8 )
Q If “Shift System Not Active Apply Parking Brake Securely While Parking
See Owner’s Manual” is shown
Indicates a temporary operation failure or malfunction in the s hift control sys-
tem. Immediately have the vehicle inspected by any authorized T oyota
retailer or Toyota authorized repairer, or any reliable repaire r.
When the message is shown, the hybrid system may not be started or the
shift position may not be changed normally. (Coping method: P. 672)
Q If “Shift System Malfunction Apply Parking Brake Securely While Park-
ing See Owner’s Manual” is shown
Indicates a malfunction in the shift control system. Immediatel y have the vehi-
cle inspected by any authorized Toyota retailer or Toyota autho rized repairer,
or any reliable repairer.
When the message is shown, the hybrid system may not be started or the
shift position may not be changed normally. (Coping method: P. 672)