2021 TOYOTA PRIUS PLUG-IN HYBRID stop start

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Prius Plug-in Hybrid_OM_OM47D72E_(EE)
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7-1. Maintenance and care
Cleaning and protecting
the vehicle exterior ..........616
Cleaning and protecting
the vehicle interior ...........622
7-2. Maintenance
Maintenance
requirements....................628
7-3. Do-it-yourself maintenance
Do-it-yourself service
precautions ......................631
Hood ..................................634
Positioning a floor jack .......636
Engine compartment..........637
Tires ...................................650
Tire inflation pressure ........665
Wheels ...............................667
Replacing the tire ...............669
Air conditioning filter ..........681
Wiper insert
replacement .....................685
Electronic key battery ........688
Checking and replacing
fuses ................................691
Light bulbs .........................695
8-1. Essential information
Emergency flashers .......... 704
If your vehicle has to
be stopped in an
emergency ...................... 705
If the vehicle is trapped in
rising water...................... 706
8-2. Steps to take in an
emergency
If your vehicle needs
to be towed ..................... 707
If you think something is
wrong .............................. 713
If a warning light turns on
or a warning buzzer
sounds ............................ 714
If a warning message is
displayed ......................... 723
If you have a flat tire .......... 731
If the hybrid system will
not start ........................... 749
If the electronic key does
not operate properly ........ 751
If the 12-volt battery is
discharged ...................... 755
If your vehicle
overheats ........................ 761
If the vehicle becomes
stuck................................ 766
7Maintenance and care8When trouble arises

16Pictorial index
Prius Plug-in Hybrid_OM_OM47D72E_(EE)
■Instrument panel (Left-hand drive vehicles)
Power switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 373
Starting the hybrid system/changing the modes . . . . . . . . . . . P. 373
Emergency stop of the hybrid system . . . . . . . . . . . . . . . . . . . P. 705
When the hybrid system will not start . . . . . . . . . . . . . . . . . . . P. 749
Warning messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 723
Shift lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 379
Changing the shift position . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 379
Precautions against towing . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 707
P position switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 380
Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 204
Reading the meters/adjusting the instrument
cluster light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 204, 206
Warning lights/indicator lights . . . . . . . . . . . . . . . . . . . . . . . . . P. 214
When the warning lights come on . . . . . . . . . . . . . . . . . . . . . . P. 714
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22Pictorial index
Prius Plug-in Hybrid_OM_OM47D72E_(EE)
■Instrument panel (Right-hand drive vehicles)
Power switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 373
Starting the hybrid system/changing the modes . . . . . . . . . . . P. 373
Emergency stop of the hybrid system . . . . . . . . . . . . . . . . . . . P. 705
When the hybrid system will not start . . . . . . . . . . . . . . . . . . . P. 749
Warning messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 723
Shift lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 379
Changing the shift position . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 379
Precautions against towing . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 707
P position switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 380
Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 204
Reading the meters/adjusting the instrument
cluster light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 204, 206
Warning lights/indicator lights . . . . . . . . . . . . . . . . . . . . . . . . . P. 214
When the warning lights come on . . . . . . . . . . . . . . . . . . . . . . P. 714
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331-1. For safe use
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Prius Plug-in Hybrid_OM_OM47D72E_(EE)
For safety and security
WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury.
● Do not adjust the position of the driver’s seat while driving.
Doing so could cause the driver to lose control of the vehicle.
● Do not place a cushion between the driver or passenger and the seatback.
A cushion may prevent correct posture from being achieved, and reduce
the effectiveness of the seat belt and head restraint.
● Do not place anything under the front seats.
Objects placed under the front seats may become jammed in the seat
tracks and stop the seat from locking in place. This may lead to an acci-
dent and the adjustment mechanism may also be damaged.
● Always observe the legal speed limit when driving on public roads.
● When driving over long distances, take regular breaks before you start to
feel tired.
Also, if you feel tired or sleepy while driving, do not force yourself to con-
tinue driving and take a break immediately.

741-3. Theft deterrent system
Prius Plug-in Hybrid_OM_OM47D72E_(EE)
Immobilizer system
The indicator light flashes after
the power switch has been turned
off to indicate that the system is
operating.
The indicator light stops flashing
after the power switch has been
turned to ACCESSORY or ON
mode to indicate that the system
has been canceled.
■ System maintenance
The vehicle has a maintenance-free type immobilizer system.
■ Conditions that may cause the system to malfunction
● If the grip portion of the key is in contact with a metallic object
● If the key is in close proximity to or touching a key registered to the security
system (key with a built-in transponder chip) of another vehicle
The vehicle’s keys have built-in transponder chips that prevent
the hybrid system from starting if a key has not been previously
registered in the vehicle’s on-board computer.
Never leave the keys inside the vehicle when you leave the vehi-
cle.
This system is designed to help prevent vehicle theft but does not
guarantee absolute security against all vehicle thefts.

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1-3. Theft deterrent system
Prius Plug-in Hybrid_OM_OM47D72E_(EE)
For safety and security
Alarm
The alarm uses light and sound to give an alert when an intrusion is
detected.
The alarm is triggered in the following situations when the alarm is
set:
● A locked door or back door is unlocked or opened in any way other
than using the entry function or wireless remote control. (The doors
will lock again automatically.)
● The hood is opened.
● If equipped, the intrusion sensor detects something moving inside
the vehicle. (An intruder gets in the vehicle.)
Close the doors and hood, and
lock all the doors using the entry
function or wireless remote con-
trol. The system will be set auto-
matically after 30 seconds.
The indicator light changes from
being on to flashing when the sys-
tem is set.
Do one of the following to deactivate or stop the alarm.
● Unlock the doors using the entry function or wireless remote con-
trol.
● Start the hybrid system. (The alarm will be deactivated or stopped
after a few seconds.)
: If equipped
The alarm
Setting the alarm system
Deactivating or stopping the alarm

1002-1. Plug-in hybrid system
Prius Plug-in Hybrid_OM_OM47D72E_(EE)
■If the plug-in hybrid system operation mode cannot be changed
In the following situations, the plug-in hybrid system operation mode cannot
be changed even if the EV/HV mode selection switch or EV City mode switch
is pressed. (In this case, the warning message is displayed on the multi-infor-
mation display when the switch is pressed.)
●When electricity needed for EV driving is not remaining (when in EV/EV City
mode)
●When the traction battery is almost completely charged (hybrid battery [trac-
tion battery] charge mode)
■When EV City mode is canceled
When EV City mode is canceled, either automatically or by pressing the EV
City mode switch, while the accelerator pedal is depressed, the drive torque
and vehicle speed may increase even if the accelerator pedal is maintained
at a fixed position. When EV City mode is canceled, a buzzer will sound and
the EV City mode indicator will flash and go off.
■When switching from EV mode to another mode using the switch
When the power switch is turned off, operation mode switching is canceled
and the system returns to EV mode the next time the vehicle is started.
■Hybrid battery (traction battery) charge mode
●The following may occur to protect the system, etc.
• Cannot switch to hybrid battery (traction battery) charge mode or cannot
cancel it
• Gasoline engine does not start or stops even after switching to hybrid bat-
tery (traction battery) charge mode
●If a load to the system is large, such as when the power consumption of the
air conditioning system is large or when the temperature of the engine cool-
ant is high, it may take longer time than usual to charge using the hybrid bat-
tery (traction battery) charge mode, or charging to the hybrid battery
(traction battery) may not be performed.

1022-1. Plug-in hybrid system
Prius Plug-in Hybrid_OM_OM47D72E_(EE)
■When in HV mode
The vehicle can be used in the same way as a standard hybrid
vehicle.
In HV mode, controls are primarily carried out as follows in accor-
dance with the driving conditions.
●The gasoline engine stops
* when the vehicle is stopped.
●During start off, the electric motor (traction motor) drives the vehi-
cle.
●During normal driving, the gasoline engine and electric motor
(traction motor) are controlled effectively, and the vehicle is
driven with optimum fuel efficiency. Also, when necessary, the
electric motor (traction motor) operates as an electrical generator
to charge the hybrid battery (traction battery).
●When the accelerator pedal is depressed heavily, drive force
from both the gasoline engine and the electric motor (traction
motor) is used to accelerate.
*: When the hybrid battery (traction battery) requires charging or the
engine is warming up, etc., the gasoline engine will not automatically
stop. (P. 105)
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When braking (regenerative braking)
The electric motor (traction motor) charges the hybrid battery (trac-
tion battery).
The EV driving range can be extended by actively using this regen-
erative braking to store electricity in the hybrid battery (traction bat-
tery).
Moreover, as fuel consumption is also reduced when in HV mode,
the regenerative braking system can be used effectively.