overheating TOYOTA HIGHLANDER HYBRID 2017 XU50 / 3.G Owners Manual

901-2. Hybrid system
HIGHLANDER_HV_U (OM48F12U)
WARNING
■Hybrid battery (traction battery)
● Never resell, hand over or modify the hybrid battery. To prevent accidents,
hybrid batteries that have been removed from a disposed vehicle are col-
lected through your Toyota dealer. Do not dispose of the battery yourself.
Unless the battery is properly collected, the following may occur, resulting
in death or serious injury:
• The hybrid battery may be illegally disposed of or dumped, and it is haz-
ardous to the environment or someone may touch a high voltage part,
resulting in an electric shock.
• The hybrid battery is intended to be used exclusively with your hybrid
vehicle. If the hybrid battery is used outside of your vehicle or modified
in any way, accidents such as electric shock, heat generation, smoke
generation, an explosion and electrolyte leakage may occur.
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 without the hybrid battery having been
removed, there is a danger of serious 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 your
Toyota dealer or a qualified service shop. If the hybrid battery is not dis-
posed of properly, it may cause electric shock that can result in death or
serious injury.
NOTICE
■Hybrid battery (traction battery) air intake vents
● Do not place objects that will block the air intake vents. The hybrid battery
(traction battery) may overheat and be damaged.
● Clean the air intake vents regularly to prevent the hybrid battery (traction
battery) from overheating.
● Do not get water or foreign materials in the air intake vents as this may
cause a short circuit and damage the hybrid battery (traction battery).
● 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.

1062. Instrument cluster
HIGHLANDER_HV_U (OM48F12U)
NOTICE
■To prevent damage to the engine and its components
The engine may be overheating if the engine coolant temperature gauge is
in the red zone (H). In this case, immediately stop the vehicle in a safe
place, and check the engine after it has cooled completely. ( →P. 631)

1994-1. Before driving
4
Driving
HIGHLANDER_HV_U (OM48F12U)
WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury.
■When the vehicle is parked
● Do not leave glasses, cigarette lighters, spray cans, or soft drink cans in
the vehicle when it is in the sun.
Doing so may result in the following:
• Gas may leak from a cigarette lighter or spray can, and may lead to a
fire.
• The temperature inside the vehicle may cause the plastic lenses and plastic material of glasses to deform or crack.
• Soft drink cans may fracture, causing the contents to spray over the interior of the vehicle, and may also cause a short circuit in the vehicle’s
electrical components.
● Do not leave cigarette lighters in the vehicle. If a cigarette lighter is in a
place such as the glove box or on the floor, it may be lit accidentally when
luggage is loaded or the seat is adjusted, causing a fire.
● Do not attach adhesive discs to the windshield or windows. Do not place
containers such as air fresheners on the instrument panel or dashboard.
Adhesive discs or containers may act as lenses, causing a fire in the vehi-
cle.
● Do not leave a door or window open if the curved glass is coated with a
metallized film such as a silver-colored one. Reflected sunlight may cause
the glass to act as a lens, causing a fire.
● Always apply the parking brake, shift the shift lever to P, stop the hybrid
system and lock the vehicle.
Do not leave the vehicle unattended while the “READY” indicator is illumi-
nated.
If the vehicle is parked with the shift lever in P but the parking brake is not
set, the vehicle may start to move, possibly leading to an accident.
● Do not touch the exhaust pipe while the “READY” indicator is illuminated
or immediately after turning the hybrid system off.
Doing so may cause burns.
■ When taking a nap in the vehicle
Always turn the hybrid system off. Otherwise, if you accidentally move the
shift lever or depress the accelerator pedal, this could cause an accident or
fire due to hybrid system overheating. Additionally, if the vehicle is parked in
a poorly ventilated area, exhaust gases may collect and enter the vehicle,
leading to death or a serious health hazard.

2184-1. Before driving
HIGHLANDER_HV_U (OM48F12U)
●Note that when making a turn, the trailer wheels will be closer than
the vehicle wheels to the inside of the turn. Compensate by making
a wider than normal turning radius.
● Slow down before making a turn, in cross winds, on wet or slippery
surfaces, etc.
Increasing vehicle speed c an destabilize the trailer.
● Take care when passing other vehicles. Passing requires consider-
able distance. After passing a vehi cle, do not forget the length of
your trailer, and be sure you hav e plenty of room before changing
lanes.
● To maintain engine braking efficiency and charging system perfor-
mance when using engine braking, do not put the transmission in
D. If in the S mode, the transmis sion shift range position must be in
4 or lower.
● Instability happens more frequently when descending steep or long
downhill grades. Before descending, slow down and downshift. Do
not make sudden downshifts while descending steep or long down-
hill grades.
● Avoid holding the brake pedal down too long or applying the brakes
too frequently. This could cause the brakes to overheat and result in
reduced braking efficiency.
● Due to the added load of the trailer, your vehicle’s engine may over-
heat on hot days (at temperatures over 85 °F [30°C]) when driving
up a long or steep grade. If t he engine coolant temperature gauge
indicates overheating, immediately turn off the air conditioning (if in
use), pull your vehicle off the road and stop in a safe spot.
( → P. 631)

2284-2. Driving procedures
HIGHLANDER_HV_U (OM48F12U)■
If the hybrid system does not start
●The immobilizer system may not have been deactivated. ( →P. 91)
Contact your Toyota dealer.
● Check that the shift lever is securely set in P. The hybrid system may not
start if the shift lever is displaced out of P.
■ Steering lock
After turning the power switch off and opening and closing the doors, the
steering wheel will be locked due to the steering lock function. Operating the
power switch again automatically cancels the steering lock.
■ When the steering lock cannot be released
■ Steering lock motor o verheating prevention
To prevent the steering lock motor from overheating, operation of the motor
may be suspended if the hybrid system is turned on and off repeatedly in a
short period of time. In this case, refrain from operating the hybrid system.
After about 10 seconds, the steering lock motor will resume functioning.
■ When “Check SMART Key System” will be displayed on the multi-infor-
mation display
The system may be malfunctioning. Have the vehicle inspected by your
Toyota dealer immediately.
■ If the “READY” indicator does not come on
In the event that the “READY” indicator does not come on even after perform-
ing the proper procedures for starting the vehicle, contact your Toyota dealer
immediately.
■ If the hybrid system is malfunctioning
→P. 581
■ If the electronic key battery is depleted
→P. 539 “Steering Lock active” will be displayed on
the multi-information display.
Check that the shift lever is set in P. Press
the power switch while turning the steer-
ing wheel left and right.

2404-2. Driving procedures
HIGHLANDER_HV_U (OM48F12U)
To set the parking brake, fully
depress the parking brake pedal
with your left foot while depress-
ing the brake pedal with your right
foot.
(Depressing the pedal again
releases the parking brake.)
*1:For U.S.A.
*2: For Canada
■Parking the vehicle
→P. 192
■ Parking brake engaged warning buzzer
→P. 581
■ Usage in winter time
→P. 337
Parking brake
Operating instructions
*1*2
NOTICE
■Before driving
Fully release the parking brake.
Driving the vehicle with the parking brake set will lead to brake components
overheating, which may affect braking performance and increase brake
wear.

3324-5. Using the driving support systems
HIGHLANDER_HV_U (OM48F12U)■
ECB operation sound
ECB operating sound may be heard in the following cases, but it does not
indicate that a malfunction has occurred.
●Operating sound heard from the engine compartment when the brake pedal
is operated.
● Motor sound of the brake system heard from the front part of the vehicle
when the driver’s door is opened.
● Operating sound heard from the engine compartment when one or two min-
utes passed after the stop of the hybrid system.
■ EPS operating sound
When the steering wheel is operated, a motor sound (whirring sound) may be
heard. This does not indicate a malfunction.
■ Automatic reactivation of TRAC and VSC systems
After turning the TRAC and VSC systems off, the systems will be automati-
cally re-enabled in the following situations:
● When the power switch is turned off
● If only the TRAC system is turned off, the TRAC will turn on when vehicle
speed increases
If both the TRAC and VSC systems are turned off, automatic re-enabling will
not occur when vehicle speed increases.
■ Reduced effectiveness of the EPS system
The effectiveness of the EPS system is reduced to prevent the system from
overheating when there is frequent steering input over an extended period of
time. The steering wheel may feel heavy as a result. Should this occur, refrain
from excessive steering input or stop the vehicle and turn the hybrid system
off. The EPS system should return to normal within 10 minutes.
WARNING
■The ABS does not operate effectively when
● The limits of tire gripping performance have been exceeded (such as
excessively worn tires on a snow covered road).
● The vehicle hydroplanes while driving at high speed on wet or slick roads.
■ Stopping distance when the ABS is operating may exceed that of nor-
mal conditions
The ABS is not designed to shorten the vehicle’s stopping distance. Always
maintain a safe distance from the vehicle in front of you, especially in the
following situations:
● When driving on dirt, gravel or snow-covered roads
● When driving with tire chains
● When driving over bumps in the road
● When driving over roads with potholes or uneven surfaces

4446-1. Using the air conditioning system and defogger
HIGHLANDER_HV_U (OM48F12U)
Heated steering wheel∗/seat heaters∗/seat
ventilators
∗
∗: If equipped
The heated steering wheel and seat heaters heat the side grips
of the steering wheel and seats, respectively. Seat ventilators
maintain good airflow by blowing air from the seats.
WARNING
● Care should be taken to prevent injury if anyone in the following categories
comes in contact with the steering wheel and seats when the heater is on\
:
• Babies, small children, the elderly, the sick and the physically chal-
lenged
• Persons with sensitive skin
• Persons who are fatigued
• Persons who have taken alcohol or drugs that induce sleep (sleeping drugs, cold remedies, etc.)
● Observe the following precautions to prevent minor burns or overheating
• Do not cover the seat with a blanket or cushion when using the seat heater.
• Do not use the seat heaters more than necessary.
NOTICE
● Do not put heavy objects that have an uneven surface on the seat and do
not stick sharp objects (needles, nails, etc.) into the seat.
● To prevent 12-volt battery discharge, do not use the functions when the
hybrid system is off.

6318-2. Steps to take in an emergency
8
When trouble arises
HIGHLANDER_HV_U (OM48F12U)
●The needle of the engine coolant temperature gauge ( →P. 103)
enters the red zone or a loss of hybrid system power is experi-
enced. (For example, the vehicle speed does not increase.)
● “Hybrid System Overheated Reduced Output Power” is shown on
the multi-information display.
● Steam comes out from under the hood.
■If the needle of the engine coolant temperature gauge enters
the red zone
Stop the vehicle in a safe place and turn off the air conditioning
system, and then stop the hybrid system.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the hybrid system has
cooled down sufficiently,
inspect the hoses and radia-
tor core (radiator) for any
leaks.Radiator
Cooling fans
If a large amount of coolant
leaks, immediately contact
your Toyota dealer.
If your vehicle overheats
The following may indicate that your vehicle is overheating.
Correction procedures
1
2
3
1
2

701Alphabetical index
HIGHLANDER_HV_U (OM48F12U)
Care................................... 490, 494Aluminum wheels.................. 491
Exterior ................................. 490
Interior................................... 494
Seat belts .............................. 495
Cargo hooks............................. 457
CD player
*................................ 367
Chains....................................... 339
Child restraint system ............... 62
Booster seats, definition ......... 63
Booster seats, installation ....... 74
Convertible seats, definition ............................... 63
Convertible seats,
installation ............................ 70
Front passenger occupant classification syst em............. 54
Infant seats, definition ............. 63
Infant seats, installation .......... 70
Installing CRS with LATCH anchors .................... 68
Installing CRS with seat belts ...................................... 70
Installing CRS with top tether strap ........................... 76
Child safety ................................ 61 12-volt battery
precautions ................. 520, 629
Airbag precautions .................. 44
Back door precautions .......... 136
Child restraint system ............. 62
Glass hatch precautions ....... 143
How your child should wear the seat belt .......................... 37
Installing child restraints ......... 66
Moon roof precautions .......... 184 Panoramic moon roof
precautions......................... 189
Power window lock switch .... 178
Power window precautions ... 180
Rear door child-protectors .... 127
Removed electronic key battery precautions............. 540
Seat belt extender
precautions........................... 40
Seat belt precautions .............. 39
Seat heater precautions ....... 444
Child-protectors ...................... 127
Cleaning ........................... 490, 494 Aluminum wheels ................. 491
Exterior ................................. 490
Interior .................................. 494
Seat belts.............................. 495
Clock......................................... 461
Coat hooks ............................... 469
Compass .................................. 484
Condenser................................ 514
Console box ............................. 451
Conversation mirror ................ 460
Cooling system........................ 513 Hybrid system overheating ... 631
Cruise control Dynamic radar cruise
control ................................ 292
Cup holders ............................. 453
Curtain shield airbags............... 42
Customizable features ............ 666
C
*: Refer to “NAVIGATION AND MULTIMEDIA SYSTEM OWNER’S MANUAL”