2021 TOYOTA HIGHLANDER HYBRID cooling

3855-5. Using the other interior features
5
Interior features
HIGHLANDER HV_U
Luggage compartment
■When turning the power
outlets off
1 Turn the connected devices
off.
2 Press the AC120V switch to
turn the power outlets off.
3 Disconnect each plug from
the power outlets.
4 Close the lid of each power
outlet.
■The power outlet can be used
when
The READY indicato r is illuminated.
■Rules/regulations regarding
idling stop
The engine will start automatically to
charge the hybrid battery (traction
battery) if its charge becomes low.
In some municipalities, if the engine
starts while the vehicle is parked or
stopped, it may violate local rules or
regulations regarding idling stop and
you may be penalized. Make sure to
check the local rules and regula-
tions before using the power outlets
while the vehicle is parked or
stopped.
■Power outlets
●When connecting a device, make
sure that the total power con-
sumption of all devices connected
to the 120 VAC power outlets is less than 1500 W. If a device is
connected and the power con-
sumption is exce
eded, a protec-
tion circuit will cut the power
supply and the p ower outlets will
not be able to be used.
●Depending on the device to be
used, the current flow may be high
and the initial peak wattage may
exceed 1500 W.
In this case, the protection circuit
may operate, and the power out-
lets may not be able to be used.
●Depending on the connected
device, it may cause interference
with TV and radio broadcasts.
●The voltage of the power outlets
cannot be measured with a com-
mercially available electrical tes-
ter. If it is necessary to check the
voltage, have the vehicle
inspected by your Toyota dealer.
●While a power outlet is being
used, a cooling fan sound may be
heard from near a rear seat. This
does not indicate a malfunction.
■Devices which may not operate
correctly
The following 120 VAC devices may
not operate properly even if their
power consumption is less than
1500 W:
●Devices with high initial peak watt-
age
●Measuring devices that process
precise data
●Devices that require an extremely
stable power supply
●Devices that require a constant
power supply from the power out-
let, such as a device with a timer.
■When the 120 VAC power out-
lets cannot be used
If the AC120V switch is pressed but
the switch indicator does not illumi-
nate, the protection circuit may have
operated.
In this case, perform the appropriate
procedures as follows.

3875-5. Using the other interior features
5
Interior features
HIGHLANDER HV_U
WARNING
●Do not let children touch the
power outlets.
●Keep the power outlets free of
dust and foreign matter.
●If the plug of a device fits
loosely in a pow er outlet, even
though it is fully inserted,
replace the power outlet. For
information on replacement,
contact your Toyota dealer.
■Using the power outlets while
parked or stopped
Observe the following precau-
tions.
Failure to do so may lead to an
accident, possibly resulting in
death or serious injury.
●Make sure to engage the park-
ing brake and shift the shift lever
to P.
●Do not leave the vehicle unat-
tended while the READY indica-
tor is illuminated and a device is
connected to a power outlet.
●Make sure that the hood is
closed. As the engine will start
automatically depending on the
condition of the vehicle, make
sure that nothing is left near or
contacting the ex haust pipes.
Also, do not put your head or
hands anywhere inside the
engine compartment, as the
cooling fan may operate sud-
denly. Keep hands and clothing
(especially a tie, scarf, etc.)
away from the fan as they may
get caught in a fan.
●Do not use the power outlets in
an area with poor ventilation or
an enclosed area, such as a
garage without a ventilation or
exhaust system, o r in an area
where the vehicle may become
surrounded by snow, as the
exhaust gasses may accumu-
late, causing a lack of oxygen.
●Do not use the power outlets if
the vehicle has a vehicle cover
installed.
●Do not sleep in the vehicle while
using devices such as an elec-
tric heater.
■Devices to be connected
Make sure to read a ny instruction
manual which came with a device
and observe any w arnings on the
device. Do not connect a device
to a power outlet if the device is
malfunctioning or its plug is dam-
aged.
Do not use power outlets for med-
ical devices, as the output of the
power outlet may be cut, depend-
ing on the condition of the vehicle.
NOTICE
Observe the following precau-
tions.
Failure to do so may lead to the
power outlets no t operating cor-
rectly or damage to the vehicle or
a connected device.
■To avoid short circuit or mal-
function
●Do not set a dev ice which gen-
erates heat near the interior
components or on a seat. Heat
may cause these parts to melt
or burn.

4136-3. Do-it-yourself maintenance
6
Maintenance and care
HIGHLANDER HV_U
Hybrid battery
(traction bat-
tery) air intake
vent (P.441)• Vacuum cleaner,
etc.
• Phillips screw- driver
Headlight aim
( P.448)• Phillips-head
screwdriver
Light bulbs
( P.449)
• Bulb with same
number and
wattage rating as
original
• Phillips-head screwdriver
• Flathead screw- driver
• Wrench
Radiator and
condenser
(  P.419)

Tire inflation
pressure
( P.436)• Tire pressure
gauge
• Compressed air source
Washer fluid
( P.420)
• Water or washer
fluid containing
antifreeze (for
winter use)
• Funnel (used only for adding
water or washer
fluid)
WARNING
The engine compartment contains
many mechanisms and fluids that
may move suddenly, become hot,
or become electrically energized.
To avoid death or serious injury,
observe the following precautions.
ItemsParts and tools■When working on the engine
compartment
●Make sure that the “ACCES-
SORY” or “IGNITION ON” on
the multi-information display
and the “READY” indicator are
both off.
●Be careful not to touch the
engine, power control unit, radi-
ator, exhaust manifold, etc. right
after driving as they may be hot.
Oil and other fluids may also be
hot.
●Do not leave anything that may
burn easily, such as paper and
rags, in the engine compart-
ment.
●Do not smoke, cause sparks or
expose an open flame to fuel.
Fuel fumes are flammable.
■When working near the elec-
tric cooling fan or radiator
grille
Be sure the power switch is off.
With the power switch in ON, the
electric cooling fa n may automati-
cally start to run if the air condi-
tioning is on and/or the coolant
temperature is high. ( P.419)
■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
filter
Driving with the air cleaner filter
removed may cause excessive
engine wear due to dirt in the air.

4166-3. Do-it-yourself maintenance
HIGHLANDER HV_U
Engine coolant reservoir ( P.418)
Fuse boxes ( P.446)
Engine oil filler cap ( P.417)
Engine oil level dipstick ( P.417)
Brake fluid reservoir ( P.420)
Washer fluid tank ( P.420)
Electric cooling fan
Condenser ( P.419)
Radiator ( P.419)
Power control unit coolant reservoir ( P.419)
■12-volt battery
 P. 4 2 1
With the engine at operating
temperature and turned off,
check the oil level on the dip-
Engine compar tment
Components
Checking and adding the
engine oil

4196-3. Do-it-yourself maintenance
6
Maintenance and care
HIGHLANDER HV_U
Reservoir cap
“FULL” line
“LOW” line
If the level is on or below the “LOW”
line, add coolant up to the “FULL”
line. (P.504)
■Power control unit coolant
reservoir
The coolant level is satisfactory
if it is between the “FULL” and
“LOW” lines on the reservoir
when the hybrid system is cold.
Reservoir cap
“FULL” line
“LOW” line
If the level is on or below the “LOW”
line, add coolant up to the “FULL”
line. ( P.504)
■Coolant selection
Only use “Toyota Super Long Life
Coolant” 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.
U.S.A.:
“Toyota Super Long Life Coolant” is
a mixture of 50% coolant and 50%
deionized water. (Minimum tem-
perature: -31°F [-35°C])
Canada: “Toyota Super Long Life Coolant” is
a mixture of 55% c
oolant and 45%
deionized water. (Minimum tem-
perature: -44°F [-42°C])
For more details about coolant, con-
tact your Toyota dealer.
■If the coolant level drops within
a short time of replenishing
Visually check the radiator, hoses,
engine/power control unit coolant
reservoir caps, drain cock and water
pump.
If you cannot find a leak, have your
Toyota dealer test the cap and
check for leaks in the cooling sys-
tem.
Check the radiator and con-
WARNING
■When the hybrid system is
hot
Do not remove the engine/power
control unit coolant reservoir caps
and radiator cap.
The cooling system may be under
pressure and may spray hot cool-
ant 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
mixture of water and antifreeze
must be used to provide proper
lubrication, corrosion protection
and cooling. Be sure to read the
antifreeze or coolant label.
■If you spill coolant
Be sure to wash it off with water to
prevent it from damaging parts or
paint.
Checking the radiator and
condenser

4416-3. Do-it-yourself maintenance
6
Maintenance and care
HIGHLANDER HV_U
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
airgun, etc. may push it into the air
intake vent. (P.443)
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 Remove the air intake vent
cover.
Pull the cover as shown in the illus-
tration to disengage the 6 claws,
starting from the claw in the upper
right corner and pull the cover
toward the front of the vehicle to
remove it.
3 Remove the air intake vent
filter.
Disengage the claw to remove the
filter from the rear scuff plate.
Cleaning the hybrid
batter y (traction bat-
ter y) air intake vents
and filter
To prevent the fuel economy
from being affected, visually
inspect the hybrid battery
(traction battery) air intake
vents periodically for dust
and clogs. If it is dusty or
clogged or if “Maintenance
Required for Traction Bat-
tery Cooling Parts See
Owner’s Manual” is shown
on the multi-information
display, clean the air intake
vent using the following
procedures:
Cleaning the air intake
vents
If dust and clogs cannot
be completely removed

4426-3. Do-it-yourself maintenance
HIGHLANDER HV_U
4Remove 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.
5Reinstall the filter to the
cover.
Engage the 3 claw to install the fil-
ter.
Make sure that t he filter is not
crooked or deformed when install-
ing it.
6 Install the air intake vent
cover.
I ns er t t he t ab o f th e co ve r a s sh ow n
in the illustrati on and push the cover to enga
ge the 6 claws.
■Scheduled maintenance of the
air intake vent is necessary
when
In some situations such as when the
vehicle is used frequently or in
heavy traffic or dusty areas, the air
intake vent may need to be cleaned
more regularly. For d etails, refer to
“Scheduled Maintenance Guide”.
■Cleaning the air intake vent
●Dust in the air intake vent may
interfere with the cooling of the
hybrid battery (trac tion battery). If
charging/discharging of the hybrid
battery (traction battery) becomes
limited, the distance that the vehi-
cle 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 periodi-
cally.
●Improper handling of the air intake
vent cover and filt er may result in
damage to them. If you have any
concerns about cleaning the filter,
contact your Toyota dealer.
■If “Maintenance Required for
Traction Battery Cooling Parts
See Owner’s Manual” is shown
on the multi-information display
●If this warning message is shown
on the multi-information display,
remove the air intake vent cover
and clean the filter. ( P.441)
●After cleaning the air intake vent,
start the hybrid system and check

4436-3. Do-it-yourself maintenance
6
Maintenance and care
HIGHLANDER HV_Uthat the warning message is no
longer shown. It may take approxi-
mately 20 minutes after the hybrid
system is started until the warning
message disappears. If the warn-
ing message does not disappear,
have the vehicle inspected by
your Toyota dealer.
WARNING
■When cleaning the air intake
vent
●Do not use water or other liq-
uids to clean the air intake vent.
If water is applied to the hybrid
battery (traction battery) or
other components, a malfunc-
tion or fire may occur.
●Before cleaning the air intake
vents, make su
re to turn the
power switch off to stop the
hybrid system.
NOTICE
■When cleaning the air intake
vent
When cleaning the air intake vent,
make sure to only use a vacuum
to suck out dust and clogs. If a
compressed air blow gun, etc. is
used to blow out dust and clogs,
the dust or clogs may be pushed
into the air intake vent, which may
affect the performance of the
hybrid battery (tr action battery)
and cause a malfunction.
■To prevent damage to the
vehicle
●Do not allow wa ter or foreign
matter to enter the air intake
vent when the cover is
removed.
●Carefully handle the removed
filter so that i t will not be dam-
aged. If the filter is damaged,
have it replaced with a new filter
by your Toyota dealer.
●Make sure to reinstall the filter
and cover to their original posi-
tions after cleaning.
●Do not install anything to the air
intake vent other than the exclu-
sive filter for this vehicle or use
the vehicle witho ut the filter
installed.
■If “Maintenance Required for
Traction Battery Cooling
Parts See Owner’s Manual” is
shown on the multi-informa-
tion display
If the vehicle is continuously
driven with the warning message
(indicating that charging/discharg-
ing of the hybrid battery (traction
battery) may become limited) dis-
played, the hybrid battery (traction
battery) may malfunction. If the
warning message is displayed,
clean the air intake vent immedi-
ately.