fuel TOYOTA HIGHLANDER HYBRID 2023 Workshop Manual

3936-3. Do-it-yourself maintenance
6
Maintenance and care
Hybrid battery
(traction bat-
tery) air intake
vent (P.420)• Vacuum cleaner,
etc.
• Phillips screw- driver
Headlight aim
( P.427)• Phillips-head
screwdriver
Light bulbs
( P.428)
• Bulb with same
number and
wattage rating as
original
• Phillips-head screwdriver
• Flathead screw- driver
• Wrench
Radiator and
condenser
(  P.400)

Tire inflation
pressure
( P.415)• Tire pressure
gauge
• Compressed air source
Washer fluid
( P.401)
• 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.400)
■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.

4156-3. Do-it-yourself maintenance
6
Maintenance and care
The recommended cold tire
inflation pressure and tire size
are displayed on the tire and
loading information label.
(P.495)
Tire valve
Tire pressure gauge
1 Remove the tire valve cap. 2
Press the tip of the tire pres-
sure gauge onto the tire
valve.
3 Read the pressure using the
gauge gradations.
4 If the tire inflation pressure is
not at the recommended
level, adjust the pressure.
If you add too much air, press
the center of the valve to
deflate.
5 After completing the tire infla-
tion pressure measurement
and adjustment, apply soapy
water to the valve and check
for leakage.
6 Put the tire valve cap back
on.
■Tire inflation pressure check
interval
You should check ti re inflation pres-
sure every two week s, or at least
once a month. Do not forget to
check the spare.
■Effects of incorrect tire inflation
pressure
Driving with incorrec t tire inflation
pressure may resul t in the following:
●Reduced fuel economy
●Reduced driving comfort and poor
handling
●Reduced tire life due to wear
●Reduced safety
●Damage to the drive train
If a tire needs frequent inflating,
have it checked by your Toyota
dealer.
■Instructions for checking tire
inflation pressure
When checking tire inflation pres-
Tire inflation pressure
Checking the specified
tire inflation pressure
Inspection and adjust-
ment procedure

4206-3. Do-it-yourself maintenance
■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 details, refer to “Scheduled
Maintenance Guide”.
■Cleaning the air intake vent
Improper handling of the air intake
vent cover and filter may result in
damage to them. If you have any
concerns about cleaning the filter,
contact your Toyota dealer.
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.
Cleaning the hybrid
batter y (traction bat-
ter y) air intake vents
To prevent the fuel economy
from being affected, visually
inspect the hybrid battery
(traction battery) air intake
vents periodically for clogs.
If it is dusty or clogged or if
“Maintenance Required for
Traction Battery Cooling
Parts See Owner’s Manual”
is shown on the multi-infor-
mation display, clean the air
intake vent using the follow-
ing procedures:
NOTICE
■If “Maintenance Required for
Traction Battery Cooling
Parts See Owner’s Manual” is
displayed on the multi-infor-
mation display
Clean the air intake vent immedi-
ately.
If the vehicle is continuously
driven with the warning message
displayed, it may cause a mal-
function or output restriction of the
hybrid battery (traction battery).
Cleaning procedure

437
7
7
When trouble arises
When trouble arises
.7-1. Essential informationEmergency flashers .... 438
If your vehicle has to be stopped in an emergency.................................. 438
If the vehicle is submerged or water on the road is ris-
ing ............................. 439
7-2. Steps to take in an emer- gency
If your vehicle needs to be towed......................... 441
If you think something is wrong ........................ 443
If a warning light turns on or a warning buzzer sounds
.................................. 445
If a warning message is dis- played........................ 456
If you have a flat tire.... 461
If the hybrid system will not start ........................... 474
If you lose your keys ... 475
If the fuel filler door cannot be opened ................. 476
If the electronic key does not operate properly .. 477
If the 12-volt battery is dis- charged ..................... 479
If your vehicle overheats .................................. 484
If the vehicle becomes stuck .................................. 488

4487-2. Steps to take in an emergency
■Electric power steering system warning light (warning
buzzer)
■Low fuel level warning light
■Driver’s and front passenger’s seat belt reminder light (warn-
ing buzzer)*
*: Driver’s seat belt warning buzzer:
The driver’s seat belt warning buzzer sounds to alert the driver that his or
her seat belt is not fastened. O nce the power switch is turned to ON, the
buzzer sounds. If the seat belt is still un fastened, the buzzer sounds inter-
mittently for a certain period of time after the vehicle reache s a certain
speed.
Front passenger’s seat belt warning buzzer:
The front passenger’s seat belt w arning buzzer sounds to alert the front
passenger that his or her seat belt is not fastened. If the seat belt is unfas-
tened, the buzzer sounds intermittently for a certain period of time after the
vehicle reaches a certain speed.
Warning lightDetails/Actions
(red/yellow)
Indicates a malfunction in th e EPS (Electric Power Steer-
ing) system
 Have the vehicle inspected by your Toyota dealer
immediately.
Warning lightDetails/Actions
Indicates that remaining fuel is approximately 2.6 gal. (9.7
L, 2.1 Imp. gal.) or less
 Refuel the vehicle.
Warning lightDetails/Actions
Warns the driver and/or front passenger to fasten their seat
belts
Fasten the seat belt.
If the front passenger’s se at is occupied, the front
passenger’s seat belt also needs to be fastened to
make the warning light (w arning buzzer) turn off.

4537-2. Steps to take in an emergency
7
When trouble arises
the warning light to flash and the
warning buzzer to sound even if a
passenger is not sitting in the
seat.
●If a cushion is placed on the seat,
the sensor may not detect a pas-
senger, and the warning light may
not operate properly.
■SRS warning light
This warning light system monitors
the airbag sensor assembly, front
impact sensors, side impact sensors
(front), side impact sensors (front
door), side impact sensors (rear),
driver’s seat position sensor,
driver’s seat belt buckle switch, front
passenger occupant classification
system (ECU and sensors), “PASS
AIR BAG ON” indicator light, “PASS
AIR BAG OFF” indicator light, front
passenger’s seat belt buckle switch,
driver’s seat belt pretensioner, front
passenger’s seat be lt pretensioner
and force limiter, airbags, intercon-
necting wiring and power sources.
(  P.34)
■If the malfunction indicator
lamp comes on while driving
First check the following:
●Is the fuel t ank empty?
If it is, fill the f uel tank immediately.
●Is the fuel tank cap loose?
If it is, tighten it securely.
The light will go o ff after several
driving trips.
If the light does not go off even after
several trips, contact your Toyota
dealer as soon as possible.
■Electric power steering system
warning light (warning buzzer)
When the 12-volt battery charge
becomes insufficien t or the voltage
temporarily drops, the electric power
steering system warning light may
come on and the warning buzzer
may sound.
■When the tire pressure warning
light comes on
Inspect the tires to check if a tire is
punctured.
If a tire is punctured: P. 4 6 1
If none of the tires are punctured:
Turn the power switch off then turn it
to ON. Check if th e tire pressure
warning light com es on or blinks.
If the tire pressure warning light
blinks for 1 minute then stays on
There may be a malfunction in the
tire pressure warning system. Have
the vehicle inspected by your Toyota
dealer immediately.
If the tire pressur e warning light
comes on
1 After the temperature of the tires
has lowered sufficiently, check
the inflation pressure of each tire
and adjust them to the specified
level.
2 If the warning light does not turn
off even after several minutes
have elapsed, check that the
inflation pressure of each tire is
at the specified level and perform
initialization. ( P.410)
If the warning light d oes not turn off
several minutes af ter the initializa-
tion has been performed, have the
vehicle inspected by your Toyota
dealer immediately.
■The tire pressure warning light
may come on due to natural
causes
The tire pressure warning light may
come on due to natural causes such
as natural air leaks and tire inflation
pressure changes caused by tem-
perature. In this ca se, adjusting the
tire inflation pressure will turn off the
warning ligh t (after a few minutes).
■When a tire is replaced with a
spare tire
The compact spare tire is not
equipped with a tire pressure warn-
ing valve and tran smitter. If a tire
goes flat, the tire pressure warning

4557-2. Steps to take in an emergency
7
When trouble arises
WARNING
As an added safety feature, your
vehicle has been equipped with a
tire pressure m onitoring system
(TPMS-tire pressure warning sys-
tem) that illuminates a low tire
pressure telltale (tire pressure
warning light) when one or more
of your tires is significantly
under-inflated. Accordingly, when
the low tire pressure telltale (tire
pressure warning light) illumi-
nates, you should stop and check
your tires as soon as possible,
and inflate them to the proper
pressure. Driving on a signifi-
cantly under-inflated tire causes
the tire to overheat and can lead
to tire failure. Under-inflation also
reduces fuel efficiency and tire
tread life, and may affect the vehi-
cle’s handling and stopping ability.
Please note that the TPMS (tire
pressure warning system) is not a
substitute for pro per tire mainte-
nance, and it is the driver’s
responsibility to maintain correct
tire pressure, even if under-infla-
tion has not reach ed the level to
trigger illumination of the TPMS
low tire pressure telltale (tire pres-
sure warning light).
Your vehicle has also been
equipped with a TPMS (tire pres-
sure warning system) malfunc-
tion indicator to indicate when the
system is not operating properly.
The TPMS (tire pressure warning
system) malfunction indicator is
combined with the low tire pres-
sure telltale (tire pressure warning
light). When the system detects a
malfunction, the te lltale will flash
for approximately one minute and
then remain continuously illumi-
nated. This sequence will con-
tinue upon subsequent vehicle
start-ups as long as the malfunc-
tion exists. When the malfunction
indicator is illuminated, the sys-
tem may not be ab le to detect or
signal low tire pressure as
intended.
TPMS (tire pressure warning sys-
tem) malfunctions may occur for a
variety of reasons, including the
installation of replacement or
alternate tires or wheels on the
vehicle that prevent the TPMS
(tire pressure warning system)
from functioning properly. Always
check the TPMS (tire pressure
warning system) malfunction tell-
tale after replacing one or more
tires or wheels on your vehicle to
ensure that the replacement or
alternate tires and wheels allow
the TPMS (tire pressure warning
system) to continue to function
properly.
NOTICE
■To ensure the tire pressure
warning system operates
properly
Do not install tires with different
specifications or makers, as the
tire pressure warning system may
not operate properly.

4597-2. Steps to take in an emergency
7
When trouble arises
resolved. (causes a nd coping meth-
ods: P.240)
■If “Radar Cruise Control
Unavailable” is shown
The dynamic radar cruise control
with full-speed range system cannot
be used temporarily. Use the system
when it becomes available again.
■If a message that indicates the
malfunction of front camera is
displayed
The following sys tems may be sus-
pended until the pr oblem shown in
the message is resolved. ( P.240,
451)
●PCS (Pre-Collision system)
●LTA (Lane Tracing Assist)
●Automatic High Beam
●RSA (Road Sign Assist) (if
equipped)
●Dynamic radar cruise control with
full-speed range
■If a message that indicates the
malfunction of radar sensor is
displayed
The following sys tems may be sus-
pended until the pr oblem shown in
the message is resolved. ( P.240,
451)
●PCS (Pre-Collision system)
●LTA (Lane Tracing Assist)
●Dynamic radar cruise control with
full-speed range
■If “AWD System Overheated
Switching to 2WD Mode” or
“AWD System Overheated 2WD
Mode Engaged” is displayed
This message may be displayed
when driving under extremely high
load conditions.
Drive the vehicle at low speeds and
stop the vehicle in a safe place with
the hybrid system operating until the
message is cleared.
If the message is not cleared, have
the vehicle inspected by your Toyota dealer.
■If “Check Fuel Cap” is dis-
played
The fuel tank cap is not properly
installed. Correctly install the fuel
tank cap.
■If “Maintenance Required
Soon” is displayed
Indicates that all maintenance
according to the driven distance on
the maintenance schedule
* should
be performed soon.
Comes on approximately 4500
miles (7200 km) after the message
has been reset. If necessary, per-
form maintenance. Please reset the
message after the maintenance is
performed. ( P.387)
*: Refer to the separate “Scheduled
Maintenance Guide” or “Owner’s
Manual Supplement” for the main-
tenance interval applicable to your
vehicle.
■If “Maintenance Required Visit
Your Dealer” is displayed
Indicates that all maintenance is
required to correspond to the driven
distance on the maintenance sched-
ule
*.
Comes on approximately 5000
miles (8000 km) after the message
has been reset. (The indicator will
not work properly unless the mes-
sage has been rese t.) Perform the
necessary maintenance. Please
reset the message after the mainte-
nance is performed. ( P.387)
*: Refer to the separate “Scheduled
Maintenance Guide” or “Owner’s
Manual Supplement” for the main-
tenance interval applicable to your
vehicle.
■If “Oil Maintenance Required
Soon” is displayed
Indicates that the engine oil should
be scheduled to be changed.

4607-2. Steps to take in an emergency
Check the engine oil and change it if
necessary. After changing the
engine oil, make sure to reset the
message. (P.398)
■If “Oil Maintenance Required” is
displayed
Indicates that the engine oil should
be changed.
Check and change the engine oil,
and oil filter by your Toyota dealer.
After changing the engine oil, make
sure to reset the message.
(  P.398)
■If a message that indicates the
need for visiting your Toyota
dealer is displayed
The system or part shown on the
multi-information display is malfunc-
tioning. Have the vehicle inspected
by your Toyota dealer immediately.
■If a message that indicates the
need for referring to Owner’s
Manual is displayed
●If any of the following messages
are shown on the multi-informa-
tion display, it may indicate a mal-
function. Immediat ely stop the
vehicle and contact your Toyota
dealer.
• “Braking Power Low Stop in a Safe Place See Owner's Manual”
• “Oil Pressure Low Stop in a Safe
Place See Owner's Manual”
• “Charging System Malfunction Stop in a Safe Place See Owner's
Manual”
• “Stop in a Safe Place See Owner's Manual”
• “Shift to P See Owner's Manual”
●If any of the following messages
are shown on the multi-informa-
tion display, the vehicle may have
run out of fuel. Stop the vehicle in
a safe place and, if the fuel level is
low, refuel the vehicle.
• “Hybrid System Stopped”
• “Engine Stopped”
●If any of the following messages
are shown on the multi-informa-
tion display, it may indicate a mal- function. Have the vehicle
inspected by your Toyota dealer
immediately.
• “Hybrid System Malfunction”
• “Check Engine”
• “Hybrid Battery System Malfunc- tion”
• “Accelerator System Malfunction”
• “Smart Key System Malfunction See Owner's Manual”
●If any of the following messages
are shown on the multi-informa-
tion display, follow the instruc-
tions.
• “Engine Coolant Temp High Stop in a Safe Place See Owner's Man-
ual” ( P.484)
●If “Maintenance Required for Trac-
tion Battery Cooling Parts See
Owner's Manual” is shown, the fil-
ters may be clogged, the air intake
vents may be blocked, or there
may be a gap in the duct. There-
fore, perform the following correc-
tion procedure.
• Cleaning the hybrid battery (trac- tion battery) air intake vents
( P.420)
If the warning message is shown
even if the vents ar e cleaned, have
the vehicle inspected by your Toyota
dealer.
NOTICE
■If “High Power Consumption
Partial Limit on AC/Heater
Operation” is displayed fre-
quently
There is a possible malfunction
relating to the charging system or
the 12-volt battery may be deteri-
orating. Have the vehicle
inspected by you r Toyota dealer.

4747-2. Steps to take in an emergency
One of the following may be the
cause of the problem:
The electronic key may not be
functioning properly.
( P.477)
 There may not be sufficient
fuel in the vehicle’s tank.
Refuel the vehicle.
 There may be a malfunction
in the immobilizer system.
( P. 7 7 )
 The hybrid system may be
malfunctioning due to an elec-
trical problem such as elec-
tronic key battery depletion or
a blown fuse. However,
depending on the type of mal-
function, an interim measure
is available to start the hybrid
system. ( P.474) One of the following may be the
cause of the problem:

The 12-volt battery may be
discharged. ( P.479)
 The 12-volt battery terminal
connections may be loose or
corroded. ( P.402)
One of the following may be the
cause of the problem:
 One or both of the 12-volt bat-
tery terminals may be discon-
nected. ( P.402)
 The 12-volt battery may be
discharged. ( P.479)
Contact your Toyota dealer if the
problem cannot be repaired, or if
repair procedures are unknown.
When the hybrid system does
not start, the following steps can
be used as an interim measure
to start the hybrid system if the
power switch is functioning nor-
mally.
Do not use this starting proce-
If the hybrid system
will not start
Reasons for the hybrid sys-
tem not starting vary
depending on the situation.
Check the following and
perform the appropriate
procedure:
The hybrid system will not
start even though the cor-
rect starting procedure is
being followed. ( P.207)
The interior lights and
headlights are dim, or the
horn does not sound or
sounds at a low volume.
The interior lights and
headlights do not turn on,
or the horn does not
sound.
Starting the hybrid sys-
tem in an emergency