cooling TOYOTA YARIS CROSS 2021 Owners Manual

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1-4. Hybrid system
For safety and security
slowly discharge. For this reason, be
sure to drive the vehicle at least once every few months for at least 30 minutes or 16 km (10 miles). If the hybrid battery
(traction battery) becomes fully dis- charged and you are unable to start the hybrid system, contact any authorized
Toyota retailer or Toyota authorized repairer, or any reliable repairer.
■Charging the 12-volt battery
 P. 4 7 8
■After the 12-volt battery has dis-
charged or when the terminal has 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 any authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer.
■Sounds and vibrations specific to a hybrid vehicle
There may be no engine sound or vibra-
tion even though the vehicle is able to move with the “READY” indicator is illu-minated. For safety, apply the parking
brake and make sure to shift the shift lever to P when parked.
The following sounds or vibrations may
occur when the hybrid system is operat- ing 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 emitted from the hybrid battery (traction battery), under the rear seats, when the hybrid
system is started or stopped.
●Sounds from the hybrid system may
be heard when the back door is open.
●Sounds may be heard from the trans-
mission 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 regener-
ative braking when the brake pedal is depressed or as the accelerator pedal is released.
●Vibration may be felt when the gaso-line engine starts or stops.
●Cooling fan sounds may be heard from the air intake vent on the side of
the lower part of the rear left seat.
■Maintenance, repair, recycling, and disposal
Contact any authorized Toyota retailer
or Toyota authorized repairer, or any reli- able repairer regarding maintenance, repair, recycling and disposal. Do not
dispose of the vehicle yourself.
■Customization
Some functions can be customized. ( P.498)
When the gasoline engine is off
while driving, a sound is produced
to warn pedestrians, people riding
bicycles or other people and vehi-
cles in the surrounding area that
the vehicle is approaching. The
pitch of the sound adjusts accord-
ing to vehicle speed. When vehicle
speed is approximately 25 km/h (16
mph) or more, the warning system
turns off.
■Acoustic vehicle alerting system
In the following cases, the acoustic vehi- cle alerting system sound may be diffi-cult for pedestrians, people riding
bicycles or other people and vehicles in
Acoustic vehicle alerting
system

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1-4. Hybrid system
There is an air intake vent under
the left side of the rear seat for the
purpose of cooling the hybrid bat-
tery (traction battery). If the vent
becomes blocked, the hybrid bat-
tery (traction battery) input and out-
put may be reduced.
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 risk
of electrocution and fuel leakage. If
the emergency shut off system acti-
WARNING
When reselling or handing over your vehicle, the possibility of an accident
is extremely high because the person receiving the vehicle may not be aware of these dangers.
●If your vehicle is disposed of with-out the hybrid battery having been
removed, there is a danger of seri- ous electric shock if high voltage parts, cables and their connectors
are touched. In the event that your vehicle must be disposed of, the hybrid battery must be disposed of
by any authorized Toyota retailer or Toyota authorized repairer, or any reliable repairer. If the hybrid bat-
tery is not disposed of properly, it may cause electric shock that can result in death or serious injury.
NOTICE
■Hybrid battery (traction battery) air intake vent
Do not carry large amounts of water such as water cooler bottles in the vehicle. If water spills onto the hybrid
battery (traction battery), the battery may be damaged. Have the vehicle inspected by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable repairer.
Hybrid battery (traction bat-
tery) air intake vent
NOTICE
■Hybrid battery (traction battery) air intake vent
●Make sure that the air intake vent is not blocked, such as by a seat cover, plastic cover, or luggage. If
the vent is blocked, the hybrid bat- tery (traction battery) input and out-put may be restricted, possibly
leading to a malfunction.
●Clean the air intake vent regularly
to prevent the hybrid battery (trac- tion battery) from overheating.
●Do not get water or foreign materi-als in the air intake vent as this may cause a short circuit and damage
the hybrid battery (traction battery).
●A filter is installed to the air intake
vent. When the filter remains noticeably dirty even after cleaning the air intake vent, filter cleaning or
replacement is recommended. Refer to P.412 for details on how to clean the filters.
Emergency shut off system

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4-5. Using the driving support systems
Each time the switch is pressed,
the system changes between
power mode, normal mode, and
ECO drive mode.
Type A
Type B
1 Normal mode
Provides an optimal balance of fuel
economy, quietness, and dynamic per-
formance. Suitable for normal driving.
2 Power mode
Controls the transmission and engine to
provide quick, powerful acceleration.
Making it suitable for when agile driving
response is desired, such as when driv-
ing on roads with many curves.
When the Power mode is selected,
Power mode indicator comes on.
3 Eco drive mode
Helps the driver accelerate in an eco-
friendly manner and improve fuel econ-
omy through moderate throttle charac-
teristics and by controlling the operation
of the air conditioning system (heat-
ing/cooling).
When the Eco drive mode is selected,
Eco drive mode indicator comes on.
■Operation of the air conditioning system in Eco drive mode
Eco drive mode controls the heat- ing/cooling operations and fan speed of the air conditioning system to enhance
fuel efficiency. To improve air condition- ing performance, perform the following operations:
●Turn off air conditioning eco mode ( P.350)
●Adjust the fan speed (P.351)
●Turn off Eco drive mode
■Automatic deactivation of Power mode
If the power switch is turned off after
driving in power mode, the drive mode will be changed to normal mode.
Driving mode select
switch
The driving modes can be
selected to suit driving condi-
tion.
Selecting a drive mode

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5-1. Using the air conditioning system and defogger
■Switching between outside air
and recirculated air modes
 To change to recirculated air
mode, press the recirculated air
mode switch.
The indicator illuminates on the recircu-
lated air mode switch.
 To change to outside air mode,
press the outside air mode
switch.
The indicator illuminates on the outside
air mode switch.
■Set cooling and dehumidifica-
tion function
Press the “A/C” switch.
When the function is on, the indicator
illuminates on the “A/C” switch.
■Defogging the windshield
Defoggers are used to defog the
windshield and front side windows.
Press the windshield defogger
switch.
Set the outside/recirculated air mode
switch to outside air mode if the recircu-
lated air mode is used. (It may switch
automatically.)
To defog the windshield and the side
windows quickly, turn the air flow and
temperature up.
To return to the previous mode, press
the windshield defogger switch again
when the windshield is defogged.
When the windshield defogger switch is
on, the indicator illuminates on the
windshield defogger switch.
■Defogging the rear window
and outside rear view mirrors
Defoggers are used to defog the
rear window, and to remove rain-
drops, dew and frost from the out-
side rear view mirrors.
Press the rear window and outside
rear view mirror defoggers switch.
The defoggers will automatically turn off
after a while.
When the rear window and outside rear
view mirror defoggers switch is on, the
indicator illuminates on the rear window
and outside rear view mirror defoggers
switch.
■Using the Climate Preference
1 Press the automatic mode
switch.
2 Press the “FAST/ECO” switch.
Each time the “FAST/ECO” switch
is pressed, the fan speed setting
mode toggles as follows.
Normal  “ECO”  “FAST”  Nor-
mal
When “ECO” is displayed on the air
conditioning screen, the air condi-
tioning is controlled with low fuel
consumption prioritized such as
reducing fan speed, etc.
When “FAST” is displayed on the
screen, fan speed will be
increased.
■Fogging up of the windows
●The windows will easily fog up when
the humidity in the vehicle is high. Turning “A/C” on will dehumidify the air from the outlets and defog the

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6-3. Do-it-yourself maintenance
Maintenance and care
WARNING
●Keep hands, clothing and tools away from the moving fan.
●Be careful not to touch the engine, power control unit, radiator, exhaust
manifold, etc. right after driving as they may be hot. Oil and other flu-ids may also be hot.
●Do not leave anything that may burn easily, such as paper and
rags, in the engine compartment.
●Do not smoke, cause sparks or
expose an open flame to fuel or 12- volt battery. Fuel and 12-volt battery fumes are flammable.
●Be extremely cautious when work-ing on the 12-volt battery. It con-
tains poisonous and corrosive sulfuric acid.
●Take care because brake fluid can harm your hands or eyes and dam-age painted surfaces. If fluid gets
on your hands or in your eyes, flush the affected area with clean water immediately.
If you still experience discomfort, consult a doctor.
■When working near the electric cooling fan or radiator grille
Be sure the power switch is OFF.
With the power switch in ON, the electric cooling fan may automatically start to run if the air conditioning is on
and/or the coolant temperature is high. ( P.393)
■Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc.
from getting in your eyes.
NOTICE
■If you remove the air cleaner fil- ter
Driving with the air cleaner filter removed may cause excessive engine wear due to dirt in the air.
■If the fluid level is low or high
It is normal for the brake fluid level to
go down slightly as the brake pads wear or when the fluid level in the accumulator is high.
If the reservoir needs frequent refill- ing, it may indicate a serious problem.

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6-3. Do-it-yourself maintenance
Maintenance and care
Washer fluid tank (P.393)
Fuse boxes ( P.418)
Power control unit coolant reservoir ( P.391)
Engine oil filler cap ( P.390)
Engine oil level dipstick ( P.390)
Engine coolant reservoir ( P. 3 9 1 )
Radiator ( P.393)
Condenser ( P.393)
Electric cooling fan
■12-volt battery
 P. 3 9 4
With the engine at operating tem-
Engine compartment
Components
Checking and adding the
engine oil

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6-3. Do-it-yourself maintenance
the reservoir when the engine is
cold.
Reservoir cap
“F” line
“L” line
If the level is on or below the “L” line,
add coolant up to the “F” line. ( P.481)
■Power control unit coolant
reservoir
The coolant level is satisfactory if it
is between the “F” and “L” lines on
the reservoir when the hybrid sys-
tem is cold.
Reservoir cap
“F” line
“L” line
If the level is on or below the “L” line,
add coolant up to the “F” line. ( P.481)
■Coolant selection
Only use “Toyota Super Long Life Cool-
ant” or a similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant with
long-life hybrid organic acid technology.
“Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50% deion-
ized water. (Minimum temperature: - 35°C [-31°F])
For more details about coolant, contact
any authorized Toyota retailer or Toyota authorized repairer, or any reliable repairer.
■If the coolant level drops within a
short time of replenishing
Visually check the radiator, hoses, engine/power control unit coolant reser-
voir caps, drain cock and water pump. If you cannot find a leak, have any authorized Toyota retailer or Toyota
authorized repairer, or any reliable repairer, test the cap and check for leaks in the cooling system.
WARNING
■When the hybrid system is hot
Do not remove the engine/power con-
trol unit coolant reservoir caps. ( P.483)
The cooling system may be under
pressure and may spray hot coolant if the cap is removed, causing serious injuries, such as burns.
NOTICE
■When adding coolant
Coolant is neither plain water nor
straight antifreeze. The correct mix- ture of water and antifreeze must be used to provide proper lubrication,
corrosion protection and cooling. Be sure to read the antifreeze or coolant label.

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6-3. Do-it-yourself maintenance
Remove the dust from the air intake
vent with a vacuum cleaner, etc.
Make sure to only use a vacuum to
suck out dust and clogs. Attempting to
blow out dust and clogs using an air-
gun, etc. may push it into the air intake
vent. ( P.414)
If dust and clogs cannot be com-
pletely removed with the air intake
vent cover installed, remove the
cover and clean the filter.
1 Turn the power switch off.
2 Using a flathead screwdriver,
remove the air intake vent cover.
1 Pull the cover as shown in the
illustration to disengage the 2
claws, starting from the claw in
the upper right corner.
2 Pull the cover toward the side of
the vehicle to remove it.
3 Remove the air intake vent filter.
1 Disengage the 2 claws as
shown in the illustration.
2 Disengage the 2 tabs and
Cleaning the hybrid bat-
ter y (traction batter y)
air intake vent and filter
To prevent the fuel economy
from being affected, visually
inspect the hybrid battery
(traction battery) air intake
vent periodically for dust and
clogs. If it is dusty or clogged
or if “Maintenance Required
for Traction Battery Cooling
Parts See Owner’s Manual” is
displayed on th e multi-infor-
mation display, clean the air
intake vent using the following
procedures:
Cleaning the air intake vent
If dust and clogs cannot be
completely removed

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6-3. Do-it-yourself maintenance
Maintenance and care
remove the filter from cover as
shown in the illustration.
4 Remove the dust and clogs from
the filter using a vacuum
cleaner, etc.
Make sure to also remove the dust and clogs from the inside of the air intake
vent cover.
5 Reinstall the filter to the cover.
1 Engage the filter to the 2 tabs as
shown in the illustration.
2 Engage the 2 claws to install the
filter.
Make sure that the filter is not crooked or deformed when installing it.
6 Install the air intake vent cover.
1 Insert the tab of the cover as
shown in the illustration.
2 Push the cover to engage the 2
claws.
■Scheduled maintenance of the air
intake vent
Refer to “Toyota Service Booklet” or “Toyota Warranty Booklet”.
■Cleaning the air intake vent
●Dust in the air intake vent may inter-fere with the cooling of the hybrid bat-
tery (traction battery). If charging/discharging of the hybrid battery (traction battery) becomes lim-
ited, the distance that the vehicle can be driven using the electric motor (traction motor) may be reduced and
the fuel economy may be reduced. Inspect and clean the air intake vent periodically.
●Improper handling of the air intake vent cover and filter may result in
damage to them. If you have any con- cerns about cleaning the filter, contact any authorized Toyota retailer or
Toyota authorized repairer, or any reli- able repairer.
■If “Maintenance Required for Trac-tion Battery Cooling Parts See
Owner’s Manual” is displayed on the multi-information display
●If this warning message is displayed on the multi-information display, remove the air intake vent cover and

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6-3. Do-it-yourself maintenance
Maintenance and care
■If the electronic key battery is depleted
The following symptoms may occur:
●The smart entry & start system (if equipped) and wireless remote control
will not function properly.
●The operational range will be reduced.
 Flathead screwdriver
 Small flathead screwdriver
 Lithium battery CR2032 (vehi-
cles without a smart entry & start
system), or CR2450 (vehicles
with a smart entry & start sys-
tem)
■Use a CR2032 (vehicles without a
smart entry & start system) or CR2450 (vehicles with a smart entry & start system) lithium bat-
tery
●Batteries can be purchased at any
authorized Toyota retailer or Toyota authorized repairer, or any reliable
NOTICE
●Do not install anything to the air intake vent other than the exclusive
filter for this vehicle or use the vehi- cle without the filter installed.
■If “Maintenance Required for Traction Battery Cooling Parts See Owner’s Manual” is dis-
played on the multi-information display
If the vehicle is continuously driven
with the warning message (indicating that charging/discharging of the hybrid battery [traction battery] may
become limited) displayed, the hybrid battery (traction battery) may mal-function. If the warning message is
displayed, clean the air intake vent immediately.
Wireless remote con-
trol/electronic key bat-
ter y
Replace the battery with a new
one if it is depleted.
As the key may be damaged if
the following procedure is not
performed properly, it is rec-
ommended that key battery
replacement be performed by
any authorized Toyota retailer
or Toyota authorized repairer,
or any reliable repairer.
Items to prepare