2021 TOYOTA PRIUS stop start

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PRIUS_OM_OM47E09U_(U)
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6-3. Do-it-yourself maintenance
Do-it-yourself service precautions ..................... 512
Hood.................................. 515
Positioning a floor jack ...... 517
Engine compartment ......... 518
Tires .................................. 532
Tire inflation pressure........ 542
Wheels .............................. 545
Air conditioning filter .......... 548
Cleaning the hybrid battery (traction battery) air intake
vent and filter .................. 551
Wiper insert replacement .................... 556
Electronic key battery ........ 560
Checking and replacing fuses ............................... 563
Headlight aim .................... 566
Light bulbs ......................... 568
7-1. Essential information Emergency flashers .......... 580
If your vehicle has to be stopped in an
emergency ...................... 581
If the vehicle is trapped in rising water...................... 582 7-2. Steps to take in an
emergency
If your vehicle needs to be towed .......................... 584
If you think something is wrong............................... 591
If a warning light turns on or a warning buzzer
sounds ............................. 592
If a warning message is displayed ......................... 603
If you have a flat tire (vehicles without
spare tire) ........................ 611
If you have a flat tire (vehicles with
spare tire) ........................ 631
If the hybrid system will not start ........................... 645
If the electronic key does not operate properly ........ 647
If the 12-volt battery is discharged ....................... 650
If your vehicle overheats.... 656
If the vehicle becomes stuck ................................ 661
7When trouble arises

18Pictorial index
PRIUS_OM_OM47E09U_(U)
■Instrument panel
Power switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 245
Starting the hybrid system/changing the modes . . . . . . . . . . . P. 245
Emergency stop of the hybrid system . . . . . . . . . . . . . . . . . . . P. 581
When the hybrid system will not start . . . . . . . . . . . . . . . . . . . P. 645
Warning messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 603
Shift lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 255
Changing the shift position . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 255
Precautions against towing . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 584
P position switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 256
Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 98
Reading the meters/adjusting the instrument
cluster light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 98, 100
Warning lights/indicator lights . . . . . . . . . . . . . . . . . . . . . . . . . P. 107
When the warning lights come on . . . . . . . . . . . . . . . . . . . . . . P. 5921
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291-1. For safe use
PRIUS_OM_OM47E09U_(U)
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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 s eat
tracks and stop the seat from locking in place. This may lead t o 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 yo u start to
feel tired.
Also, if you feel tired or sleepy while driving, do not force y ourself to con-
tinue driving and take a break immediately.

851-4. Hybrid system
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For safety and security
◆When stopped/during start off
The gasoline engine stops
* when the vehicle is stopped. During
start off, the electric motor (traction motor) drives the vehic le. At
slow speeds or when traveling down a gentle slope, the engine i s
stopped
* and the electric motor (tr action motor) is used.
When shift position is in N, the hybrid battery (traction batte ry) is not
being charged.
*: When the hybrid battery (traction battery) requires charging o r the engine
is warming up, etc., the gasoline engine will not automatically stop.
( P. 86)
◆During normal driving
The gasoline engine is predominantly used. The electric motor
(traction motor) charges the hybr id battery (traction battery) as nec-
essary.
◆When accelerating sharply
When the accelerator pedal is depressed heavily, the power of t he
hybrid battery (traction battery) is added to that of the gasol ine
engine via the electric motor (traction motor).
◆When braking (regenerative braking)
The wheels operate the electric motor (traction motor) as a pow er
generator, and the hybrid battery (traction battery) is charged.
When driving with the gasolin e engine stopped, a sound, which
changes in accordance with the driving speed, will be played in order
to warn people nearby of the vehicle’s approach. The sound will stop
when the vehicle speed exceeds approximately 22 mph (35 km/h).
Vehicle proximity notification system

861-4. Hybrid system
PRIUS_OM_OM47E09U_(U)
■Regenerative braking
In the following situations, kinetic energy is converted to electric energy and
deceleration force can be obtained in conjunction with the rech arging of the
hybrid battery (traction battery).
● The accelerator pedal is released while driving with the shift position in D or
B.
● The brake pedal is depressed while driving with the shift posit ion in D or B.
■ Hybrid System Indicator
■ Conditions in which the gasoline engine may not stop
The gasoline engine starts and stops automatically. However, it may not stop
automatically in the following conditions
*:
● During gasoline engine warm-up
● During hybrid battery (traction battery) charging
● When the temperature of the hybrid battery (traction battery) is high or low
● When the heater is switched on
*: Depending on the circumstances, the gasoline engine may also not stop
automatically in situations other than those above.
■ Charging the hybrid batt ery (traction battery)
As the gasoline engine charges the hybrid battery (traction bat tery), the bat-
tery does not need to be charged from an outside source. Howeve r, i f t h e
vehicle is left parked for a long time the hybrid battery (trac tion battery) will
slowly discharge. For this reason, be sure to drive the vehicle at least once
every few months for at least 30 minutes or 10 miles (16 km). I f the hybrid
battery (traction battery) becomes fully discharged and you are unable to start
the hybrid system, contact your Toyota dealer.
■ Charging the 12-volt battery
P. 652
■ After the 12-volt battery has discharged or when the terminal h as been
removed and installed during exchange, etc.
The gasoline engine may not stop even if the vehicle is being driven by the
hybrid battery (traction battery). If this continues for a few days, contact your
Toyota dealer. Hybrid System Indicator represents the
hybrid system power output and regener-
ative charging. ( P. 129)

871-4. Hybrid system
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For safety and security
■Sounds and vibrations sp ecific to a hybrid vehicle
There may be no engine sound or vibration even though the vehic le is able to
move with the “READY” indicator is illuminated. For safety, app ly the parking
brake and make sure to shift the shift position to P when parke d.
The following sounds or vibrations may occur when the hybrid sy stem is
operating and are not a malfunction:
● Motor sounds may be heard from the engine compartment.
● Sounds may be heard from the hybrid battery (traction battery) under the
rear seats when the hybrid system starts or stops.
● Relay operating sounds such as a snap or soft clank will be emi tted from the
hybrid battery (traction battery), under the rear seats, when the hybrid sys-
tem is started or stopped.
● Sounds from the hybrid system may be heard when the back door is open.
● Sounds may be heard from the transmission when the gasoline engine
starts or stops, when driving at low speeds, or during idling.
● Engine sounds may be heard when accelerating sharply.
● Sounds may be heard due to regenerative braking when the brake pedal is
depressed or as the accelerator pedal is released.
● Vibration may be felt when the gasoline engine starts or stops.
● Cooling fan sounds may be heard from the air intake vent. ( P. 89)
■ Vehicle proximity notification system
In the following cases, the vehicle proximity notification syst em may be diffi-
cult for surrounding people to hear.
● In very noisy areas
● In the wind or the rain
Also, as the vehicle proximity notification system is installed on the front of
the vehicle, it may be more difficult to hear from the rear of the vehicle com-
pared to the front.
■ When “Proximity Notification Syst em Malfunction Visit Your Dealer” is
displayed on the multi-information display
The vehicle proximity notification system may be malfunctioning . Have the
vehicle inspected by your Toyota dealer immediately.
■ Maintenance, repair, recycling, and disposal
Contact your Toyota dealer regarding maintenance, repair, recyc ling and dis-
posal. Do not dispose of the vehicle yourself.

891-4. Hybrid system
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For safety and security
There is an air intake vent under
the right side of the rear seat for
the purpose of cooling the hybrid
battery (traction battery). If the
vent is blocked, charging/dis-
charging of the hybrid battery
(traction battery) may become lim-
ited.
When a certain level of impact is detected by the impact sensor , the
emergency shut off system blocks the high voltage current and stops
the fuel pump to minimize the ri sk of electrocution and fuel leakage. If
the emergency shut off system activates, your vehicle will not restart.
To restart the hybrid system , contact your Toyota dealer.
A message is automatically displ ayed when a malfunction occurs in
the hybrid system or an improper operation is attempted.
If a warning message is shown on
the multi-information display, read
the message and follow the
instructions.
Hybrid battery (traction battery) air intake vent
Emergency shut off system
Hybrid warning message

951-5. Theft deterrent system
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For safety and security
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 ob ject
● 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 ha ve built-in transponder chips that prevent
the hybrid system from starting if a key has not been previousl y
registered in the vehic le’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.