overheating TOYOTA PRIUS PLUS 2019 Owners Manual

901-2. Hybrid system
PRIUS +_OM_OM47D30E_(EE)
WARNING
■Hybrid battery (traction battery)
Your vehicle contains a sealed lithium-ion 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 any authorized Toyota retailer or Toyota authorized repairer,
or any reliable repairer. 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 any autho-
rized Toyota retailer or Toyota authorized repairer, or any reliable repairer
or a qualified service shop. If the hybrid battery 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 place objects that will block the air intake vent. The hybrid battery
(traction battery) may overheat and be damaged.
● Clean the air intake vent regularly to prevent the hybrid battery (traction
battery) from overheating.
● Do not get water or foreign materials in the air intake vent 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. Have the vehicle inspected by any authorized Toyota
retailer or Toyota authorized repairer, or any reliable repairer.

1252. Instrument cluster
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Instrument cluster
PRIUS +_OM_OM47D30E_(EE)
■ Remaining hybrid battery (traction battery) charge display
The charge amount of the hybrid battery (traction battery) is automatically
controlled by the hybrid system. For this reason, even if electricity is recov-
ered via the regenerative braking, or el ectricity is generated via the gasoline
engine, the displayed hybrid battery (traction battery) charge amount may not
reach the highest level (level 8). However, this does not indicate a malfunc-
tion.
■ Engine speed
On hybrid vehicles, engine speed is precisely controlled in order to help
improve fuel efficiency and reduce exhaust emissions etc.
■ Brightness of the instrument panel light
If the headlight switch is turned to ON while the surrounding area is dark, the
instrument cluster lights will dim.
■ When disconnecting and reconnecting 12-volt battery terminals
The fuel consumption display and average vehicle speed will be reset.
NOTICE
■ To prevent damage to the engine and its components
The engine may be overheating if the high coolant temperature warning
light comes on or flashes. In this case, immediately stop the vehicle in a
safe place, and check the engine after it has cooled completely. ( P. 518)
■ The trip information display at low temperatures
Allow the interior of the vehicle to warm up before using the liquid crystal
information display. At extremely low temperatures, the information display
monitor may respond slowly, and display changes may be delayed.

2194-1. Before driving
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Driving
PRIUS +_OM_OM47D30E_(EE)
WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury.
■ 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.
■ When braking
● When the brakes are wet, drive more cautiously.
Braking distance increases when the brakes are wet, and this may cause
one side of the vehicle to brake differently than the other side. Also, the
parking brake may not securely hold the vehicle.
● If the electronically controlled assist function does not operate, do not fol-
low other vehicles closely and avoid downhill or sharp turns that require
braking.
In this case, braking is still possible, but the brake pedal should be
depressed more firmly than usual. Also, the braking distance will increase.
Have your brakes fixed immediately.
● The brake system consists of 2 or more individual hydraulic systems; if
one of the systems fails, the other(s) will still operate. In this case, the
brake pedal should be depressed more firmly than usual and the braking
distance will increase. Have your brakes fixed immediately.
NOTICE
■When driving the vehicle
● Do not depress the accelerator and brake pedals at the same time during
driving, as this may restrain driving torque.
● Do not use the accelerator pedal or depress the accelerator and brake
pedals at the same time to hold the vehicle on a hill.
■ When parking the vehicle
Always set the parking brake, and shift the shift position to P. Failure to do
so may cause the vehicle to move or the vehicle may accelerate suddenly if
the accelerator pedal is accidentally depressed.

2404-2. Driving procedures
PRIUS +_OM_OM47D30E_(EE)
Parking brake
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.)
■ Parking the vehicle
 P. 212
■ Parking brake engaged warning buzzer
 P. 451
■ Usage in winter time
 P. 327
Operating instructions
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.

3204-5. Using the driving support systems
PRIUS +_OM_OM47D30E_(EE)
■Sounds and vibrations caused by the ABS, brake assist, VSC, TRC and
hill-start assist control systems
Any of the following conditions may occur when the above systems are oper-
ating. None of these indicates that a malfunction has occurred.
●Vibrations may be felt through the vehicle body and steering.
●A motor sound may be heard after the vehicle comes to a stop.
●The brake pedal may pulsate slightly after the ABS is activated.
●The brake pedal may move down slightly after the ABS is activated.
■ECB operating 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 1-2 minutes
passed after the stop of the hybrid system.
■EPS operation sound
When the steering wheel is operated, a motor sound (whirring sound) may be
heard. This does not indicate a malfunction.
■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.
■Electric power steering system warning light (warning buzzer)
P. 445

3415-1. Using the air conditioning system and defogger
PRIUS +_OM_OM47D30E_(EE)
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Interior features
Seat heaters
Heats the left front seat
Heats the right front seat
The indicator light comes on when
the seat heater is operating.
● The seat heaters can be used when the power switch is in ON mode.
● When not in use, turn off the switch. The indicator light turns off.
: If equipped
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WARNING
●Care should be taken to prevent injury if anyone in the following categories
comes in contact with the 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 seat heater 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.

5187-2. Steps to take in an emergency
PRIUS +_OM_OM47D30E_(EE)
If your vehicle overheats
■If the high coolant temperature warning light comes on or
flashes
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 radiator core (radiator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant
leaks, immediately contact
any authorized Toyota retailer
or Toyota authorized repairer,
or any reliable repairer.
The following may indicate that your vehicle is overheating.
● The high coolant temperature warning light (P. 449) comes on
or flashes, or a loss of hybrid system power is experienced. (For
example, the vehicle speed does not increase.)
● Vehicles without multi-information display: The hybrid system
overheat warning light ( P. 449) comes on.
● Vehicles with multi-information display: The warning message
indicating overheat is shown on the multi-information display.
( P. 464)
● Steam comes out from under the hood.
Correction procedures
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3
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554Alphabetical index
PRIUS +_OM_OM47D30E_(EE)
Card holder............................... 350
Care
Aluminum wheels .................. 363
Exterior.................................. 362
Interior ................................... 367
Panoramic roof...................... 366
Radar sensor ........................ 262
Seat belts .............................. 368
Cargo hooks ............................. 351
CD player
*
Chains ....................................... 328
Child restraint system ............... 59
Baby seat definition................. 60
Baby seat installation .............. 68
Child seat definition................. 60
Child seat installation .............. 70
Installing CRS with ISOFIX
rigid anchors ......................... 74
Installing CRS with seat belt ... 68
Installing CRS with top strap ... 76
Junior seats definition ............. 60
Junior seat installation ............ 72
Child safety ................................ 58
12-volt battery precautions.... 391
Airbag precautions .................. 48
Back door precautions .......... 150
Child restraint system ............. 59
How your child should wear
the seat belt .......................... 42
Installing child restraints.......... 67
Power window lock switch .... 208
Power window precautions ... 210Rear door child-protectors .... 147
Removed key battery
precautions......................... 418
Seat belt precautions .............. 44
Seat heater precautions........ 341
Child-protectors....................... 147
Cleaning
Aluminum wheels.................. 363
Exterior ................................. 362
Interior................................... 367
Panoramic roof ..................... 366
Radar sensor ........................ 262
Seat belts .............................. 368
Climate remote control ........... 340
Clock ......................................... 355
Condenser ................................ 386
Console box ............................. 346
Coolant
Capacity ................................ 532
Checking ............................... 385
Preparing and checking
before winter....................... 327
Cooling system ........................ 385
Hybrid system overheating ... 518
Consumption screen ............... 134
Cruise control
Cruise control........................ 313
Dynamic radar cruise
control................................. 299
Cup holders.............................. 347
Curtain shield airbags ............... 46
Customizable features ............ 539
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556Alphabetical index
PRIUS +_OM_OM47D30E_(EE)
Emergency, in case of
If a warning buzzer sounds ... 444
If a warning light turns on ...... 444
If a warning message is
displayed ............................ 458
If the 12-volt battery is
discharged .......................... 513
If the electronic key does not
operate properly ................. 511
If the hybrid system will not
start..................................... 509
If the vehicle is trapped in
rising water ......................... 436
If you have a flat tire...... 478, 492
If you lose your keys ............. 143
If you think something is
wrong .................................. 443
If your vehicle becomes
stuck ................................... 523
If your vehicle has to be
stopped in an emergency ... 435
If your vehicle needs to be
towed .................................. 437
If your vehicle overheats ....... 518
Energy monitor ........................ 134Engine
Accessory mode ................... 227
Compartment ........................ 379
Engine switch........................ 224
Exhaust gas precautions ........ 80
Hood ..................................... 375
How to start the hybrid
system ................................ 224
Identification number ............ 528
If the hybrid system will not
start .................................... 509
If your vehicle has to be
stopped in an emergency ... 435
Ignition switch
(power switch) .................... 224
Overheating .......................... 518
Power switch......................... 224
Engine coolant
Capacity ................................ 532
Checking ............................... 385
Preparing and checking
before winter....................... 327
Engine coolant temperature
warning light .......................... 449

558Alphabetical index
PRIUS +_OM_OM47D30E_(EE)
Front turn signal lights
Replacing light bulbs ............. 427
Turn signal lever ................... 239
Wattage................................. 536
Fuel
Capacity ................................ 528
Fuel gauge ............................ 118
Gas station information ......... 568
Information ............................ 537
Refueling ............................... 256
Type ...................................... 528
Warning light ......................... 449
Fuel filler door .......................... 258
Fuses ........................................ 419
Gas station information .......... 568
Gauges...................................... 117
Glove box ................................. 346
Head restraints......................... 199
Headlights ................................ 241
Automatic headlight
leveling ............................... 243
Automatic High Beam
system ................................ 244
Light switch ........................... 241
Replacing light bulbs ............. 430
Heaters
Automatic air conditioning
system ................................ 332
Outside rear view mirrors ...... 335
Seat heaters.......................... 341High mounted stoplight
Replacing .............................. 430
Hill-start assist control............ 319
Hood ......................................... 375
Hooks
Cargo hooks ......................... 351
Retaining hooks (floor mat)..... 34
Horn .......................................... 202
Hybrid battery (traction battery)
Location .................................. 85
Specification ......................... 529
Hybrid battery
(traction battery) air intake
vent ........................................... 86
Hybrid system ............................ 81
Brake Override System......... 213
Drive-Start Control ................ 213
Emergency shut off system .... 86
Energy monitor/consumption
screen.......................... 128,134
EV drive mode ...................... 231
High voltage components ....... 85
Hybrid System Indicator........ 124
Hybrid system precautions ..... 85
Hybrid vehicle driving tips ..... 324
If the hybrid system will not
start .................................... 509
Overheating .......................... 518
Power switch......................... 224
Regenerative braking.............. 82
Starting the hybrid system .... 224
Hybrid System Indicator ......... 124
Hybrid transmission ................ 233
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