TOYOTA PRIUS 2021 Owners Manual (in English)

PRIUS_OM_OM47E09U_(U)
5316-3. Do-it-yourself maintenance
6
Maintenance and care
■Using the gauge (if equipped)
The washer fluid level can be checked by
observing the position of the level on the
liquid-covered holes in the gauge.
If the level falls below the second hole
from the bottom (the “LOW” position), refill
the washer fluid.
WARNING
■When adding washer fluid
Do not add washer fluid when the hybrid system is hot or operat ing as
washer fluid contains alcohol and may catch fire if spilled on the engine etc.
NOTICE
■Do not use any fluid ot her than washer fluid
Do not use soapy water or engine antifreeze instead of washer f luid.
Doing so may cause streaking on the vehicle’s painted surfaces, as well as
damaging the pump leading to problems of the washer fluid not s praying.
■ Diluting washer fluid
Dilute washer fluid with water as necessary.
Refer to the freezing temperatures listed on the label of the washer fluid bot-
tle.
Current
fluid level

532
PRIUS_OM_OM47E09U_(U)
6-3. Do-it-yourself maintenance
Tires
Check if the treadwear indicators are showing on the tires. Also check
the tires for uneven wear, such as excessive wear on one side o f the
tread.
Check the spare tire (if equipped) condition and pressure if no t
rotated.
New tread
Worn tread
Treadwear indicator
The location of treadwear indicators is shown by a “TWI” or “ ” mark,
etc., molded into the s idewall of each tire.
Replace the tires if the treadwear indicators are showing on a tire.
Replace or rotate tires in accordance with maintenance sched-
ules and treadwear.
Checking tires
1
2
3

PRIUS_OM_OM47E09U_(U)
5336-3. Do-it-yourself maintenance
6
Maintenance and care
Rotate the tires in the order shown.
To equalize tire wear and extend tire life, Toyota recommends that tire
rotation is carried ou t at the same interval as tire inspection .
Do not fail to initialize the ti re pressure warning system afte r tire rota-
tion.
Tire rotation
Vehicles without full-size spare
tireVehicles with full-size spare
tire
FrontFront

534
PRIUS_OM_OM47E09U_(U)
6-3. Do-it-yourself maintenance
Your vehicle is equipped with a tire pressure warning system that uses
tire pressure warning valves and transmitters to detect low tire infla-
tion pressure before serious problems arise.
If the tire pressure drops below a predetermined level, the dri ver is
warned by a warning light. ( P. 595)
The compact spare tire is not equipped with a tire pressure warning
valve and transmitter.
◆Installing tire pressure warn ing valves and transmitters
When replacing tires or wheels, tire pressure warning valves an d
transmitters must also be installed.
When new tire pressure warning valves and transmitters are
installed, new ID codes must be registered in the tire pressure
warning computer and the tire pressure warning system must be
initialized. Have tire pressure warning valve and transmitter I D
codes registered by your Toyota dealer. ( P. 535)
◆Initializing the tire pressure warning system
■The tire pressure warning system must be initialized when the
tire inflation pressu re is changed such a s when changing trav-
elling speed or load weight.
When the tire pressure warning sy stem is initialized, the current tire
inflation pressure is set as the benchmark pressure.
Tire pressure warning system

PRIUS_OM_OM47E09U_(U)
5356-3. Do-it-yourself maintenance
6
Maintenance and care
■How to initialize the tire pressure warning systemPark the vehicle in a s afe place and turn the power switch off.
Initialization cannot be perfo rmed while the vehicle is moving.
Adjust the tire inflation pressure to the specified cold tire i nflation
pressure level. ( P. 672)
Make sure to adjust the tire pre ssure to the specified cold tire infla-
tion pressure level. The tire pressure warning system will oper ate
based on this pr essure level.
Turn the power switch to ON mode.
Switch the multi-informatio n display to the screen.
(  P. 151)
Press or of the meter control switches, select
(“Vehicle Settings”), and then press .
Press or of the meter contro l switches, select “Mainte-
nance System”, a nd then press .
Press or of the meter cont rol switches, select “TPMS”,
and then press .
Press and hold .
When initialization com-
pletes, a message is dis-
played on the multi-
information display and the
tire pressure warning light
illuminates.
◆Registering ID codes
The tire pressure warning valve and transmitter is equipped wit h a
unique ID code. When replacing a tire pressure warning valve an d
transmitter, it is necessary to register the ID code. Have the ID code
registered by your Toyota dealer.
1
2
3
4
5
6
7
8
Until Complete
9

536
PRIUS_OM_OM47E09U_(U)
6-3. Do-it-yourself maintenance
■When to replace your vehicle’s tires
Tires should be replaced if:
●The treadwear indicators are showing on a tire.
●You have tire damage such as cuts, splits, cracks deep enough t o
expose the fabric, and bulges indicating internal damage.
●A tire goes flat repeatedly or c annot be properly repaired due to the size
or location of a cut or other damage.
If you are not sure, consult with your Toyota dealer.
■Replacing tires and wheels
If the ID code of the tire press ure warning valve and transmitt er is not reg-
istered, the tire pressure warni ng system will not work properly. A f t e r d r i v -
ing for about 20 minutes, the tire pressure warning light blink s for 1
minute and stays on to indi cate a system malfunction.
■Tire life
Any tire over 6 years old must be checked by a qualified techni cian even
if it has seldom or never been u sed or damage is not obvious.
■Routine tire inflation pressure checks
The tire pressure warning system does not replace routine tire inflation
pressure checks. Make sure to chec k tire inflation pressure as part of
your routine of daily vehicle checks.
■Maximum load of tire
Check that the maximum load of t he replacement tire is greater than 1/2
of the Gross Axle Weight Ratings (GAWR) of either the front axl e or the
rear axle, whichever is greater.
For the GAWR, see the Certification
Label. For the maximum load of the tire,
see the load limit at maximum cold tire
inflation pressure mentioned on the
sidewall of the tire. ( P. 6 7 8 )
BTO62EP049

PRIUS_OM_OM47E09U_(U)
5376-3. Do-it-yourself maintenance
6
Maintenance and care
■Tire types
●Summer tires
Summer tires are high-speed performance tires best suited to highway
driving under dry conditions. Si nce summer tires do not have th e same
traction performance as snow tires, summer tires are inadequate for
driving on snow-covered or icy ro ads. For driving on snow-covered
roads or icy roads, the use of snow tires is recommended. When install-
ing snow tires, be sure to replace all four tires.
●All season tires
All season tires are designed to provide better traction in sno w and to
be adequate for driving in most winter conditions as well as fo r use
year-round. All season tires, however, do not have adequate tra ction
performance compared with snow tires in heavy or loose snow. Al so, all
season tires fall short in acceleration and handling performanc e com-
pared with summer tires in highway driving.
●Snow tires
For driving on snow-covered roads or icy roads, we recommend us ing
snow tires. If you need snow tires, select tires of the same si ze, con-
struction and load capacity as t he originally installed tires. Since your
vehicle has radial tires as original equipment, make sure your snow
tires also have radial construct ion. Do not install studded tires without
first checking local regulations for possible restrictions. Sno w tires
should be install ed on all wheels. ( P. 430)
■If the tread on snow tires wea rs down below 0.16 in. (4 mm)
The effectiveness of the tires as snow tires is lost.
■Low profile tires (vehicl es with 215/45R17 tires)
Generally, low profile tires will wear more rapidly and tire gr ip perfor-
mance will be reduced on snowy and /or icy roads when compared to
standard tires.
Be sure to use snow tires or tire chains on snowy and/or icy roads and
drive carefully at a speed approp riate for road and weather conditions.

538
PRIUS_OM_OM47E09U_(U)
6-3. Do-it-yourself maintenance
■Situations in which the tire pressure warning system may not oper-
ate properly
●In the following cases, the tire pressure warning system may no t operate
properly.
• If non-genuine Toyota wheels are used.
• When a replacement tire is used, the system may not operate cor-
rectly due to the structure of the replacement tire.
• A tire has been replac ed with a tire that is not of the specif ied size.
• Tire chains etc . are equipped.
• An auxiliary-supported ru n-flat tire is equipped.
• If a window tint that affects the radio wave signals is instal led.
• If there is a lot of snow or ice on the vehicle, particularly around the
wheels or wheel housings.
• If the tire inflation pressure is extremely higher than the sp ecified
level.
• If wheel without the tire pressure warning valve and transmitt er is
used.
• If the ID code on the tire pressure warning valves and transmi tters is
not registered in the tire pressure warning computer.
●Performance may be affected in the following situations.
• Near a TV tower, electric power plant, gas station, radio stat ion, large
display, airport or other facilit y that generates strong radio waves or
electrical noise
• When carrying a portable radio, cellular phone, cordless phone or
other wireless communication device
●When the vehicle is parked, the time taken for the warning to s tart or go
off could be extended.
●When tire inflation pressure declines rapidly for example when a tire has
burst, the warning may not function.
■The initialization operation
●Make sure to carry out initializ ation after adjusting the tire inflation pres-
sure.
Also, make sure the tires are co ld before carrying out initialization or tire
inflation pressure adjustment.
●If you have accidentally turned the power switch off during ini tialization,
it is not necessary to press the reset swit ch again as initialization will
restart automatically when the power switch has been turned to ON
mode for the next time.
●If you accidentally press the reset switch when initialization is not neces-
sary, adjust the tire inflation pressure to the specified level when the
tires are cold, and cond uct initialization again.

PRIUS_OM_OM47E09U_(U)
5396-3. Do-it-yourself maintenance
6
Maintenance and care
■When initialization of the tire pressure warning system has fai led
Initialization can be completed i n a few minutes. However, in the following
cases, the settings have not been record ed and the system will not oper-
ate properly. If repeated attempts to record tire inflation pre ssure settings
are unsuccessful, have the vehicl e inspected by your Toyota dealer.
●When operating the initialization of the system, the tire pressure warning
light does not flash 3 times an d the setting message does not a ppear on
the multi-information display.
●After driving for a certain period of time since the initializa tion has been
completed, the warning light comes on after blinking for 1 minute.
■Certifications for the tire pressure warning system
For vehicles sold in the U.S.A., Hawaii, American Samoa, Guam,
Saipan and Puerto Rico

540
PRIUS_OM_OM47E09U_(U)
6-3. Do-it-yourself maintenance
For vehicles sold in Canada
WARNING
■When inspecting or replacing tires
Observe the following precautions to prevent accidents.
Failure to do so may cause damage to parts of the drive train as well as
dangerous handling characteristics, which may lead to an accide nt
resulting in death o r serious injury.
●Do not mix tires of different ma kes, models or tread patterns.
Also, do not mix tires of re markably different treadwear.
●Do not use tire sizes other th an those recommended by Toyota.
●Do not mix differently constructed tires (radial, bias-belted o r bias-ply
tires).
●Do not mix summer, all season and snow tires.
●Do not use tires that have b een used on another vehicle.
Do not use tires if you do not kn ow how they were used previous ly.
■When initializing the tire pressure warning system
Do not initialize the tire press ure warning system without firs t adjusting
the tire inflation pressure to t he specified level. Otherwise, the tire pres-
sure warning light may not come on even if the tire inflation p ressure is
low, or it may come on when the tire inflation pressure is actu ally nor-
mal.