overheating TOYOTA PRIUS 2019 Owners Manual (in English)

114
PRIUS_OM_OM47C35U_(U)
2. Instrument cluster
■BSM (Blind Spot Monitor) outsid e rear view mirror indicators
(if equipped) ( P. 337)
• When the BSM function is enabled on the screen of the multi-i nfor-
mation display, the power switch is turned to ON mode.
If the system is functioning correctly, the BSM outside rear vi ew mirror indi-
cators will turn off after a few seconds.
If the BSM outside rear view mirror indicators do not illuminat e or do not
turn off, there may be a malfunction in the system.
If this occurs, have the vehicle inspected by your Toyota deale r.
●
Indicators are also displayed on the out-
side rear view mirrors.
● In order to confirm operation, the BSM
outside rear view mirror indicators illumi-
nate in the following situations:
• When the power switch is in ON
mode, the BSM function is enabled
on the screen of the multi-infor-
mation display.
WARNING
■If a safety system warning light does not come on
Should a safety system light such as the ABS and SRS warning li ght not
come on when you start the hybrid system, this could mean that these sys-
tems are not available to help protect you in an accident, which could result
in death or serious injury. Have the vehicle inspected by your Toyota dealer
immediately if this occurs.
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 v ehicle in a
safe place, and check the engine after it has cooled completely. (P. 746)

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PRIUS_OM_OM47C35U_(U)
4-1. Before driving
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 veh icle 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 th at 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.
■ If the vehicle becomes stuck (AWD models)
Do not spin the wheels excessively when any of the tires is up in the air, or
the vehicle is stuck in sand, mud, etc. This may damage the driveline com-
ponents or propel the vehicle forward or backward, causing an accident.

257
PRIUS_OM_OM47C35U_(U)
4-2. Driving procedures
4
Driving
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. 224
■ Parking brake engaged warning buzzer
A buzzer will sound if the vehicle is driven with the parking b rake engaged.
“Release Parking Brake” is displayed on the multi-information display (with
the vehicle reached a speed of 3 mph [5 km/h]).
■ Usage in winter time
P. 428
Operating instructions
(U.S.A.)
(Canada)
NOTICE
■ Before driving
Fully release the parking brake.
Driving the vehicle with the parking brake set will lead to bra ke components
overheating, which may affect braking performance and increase brake
wear.

PRIUS_OM_OM47C35U_(U)
4214-5. Using the driving support systems
4
Driving
■Reduced effectiveness of the EPS system
The effectiveness of the EPS system is reduced to prevent the s ystem from
overheating when there is frequent steering input over an exten ded period of
time. The steering wheel may feel heavy as a result. Should thi s 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 wa rning light (warning buzzer)
P. 683
■ When a message related to AWD system is displayed on the multi-infor-
mation display (AWD models)
Perform the following actions.
MessageDetailsActions
“AWD System Overheated Switching to 2WD Mode”AWD system is over-
heating.Stop the vehicle for a
certain amount of time
or drive the vehicle at
approximately 6 mph
(10 km/h) or more to
reduce the overload to
the system. Once the
display message on the
multi-information dis-
play turns off, there is
no problem continuing
to drive.
“AWD System Overheated
2WD Mode Engaged”
The vehicle switched
from all-wheel drive
(AWD) to front wheel
drive due to over-
heating.
“AWD System Malfunction 2WD Mode Engaged
Visit Your Dealer”
A malfunction
occurred in the AWD
system, and the
vehicle switched to
front wheel drive.
Have the vehicle
inspected by your Toy-
ota dealer immediately.

746
PRIUS_OM_OM47C35U_(U)
8-2. Steps to take in an emergency
If your vehicle overheats
■If the high coolant temperature warning light comes on or
flashesStop 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 t he
hoses and radiator core (ra diator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant
leaks, immediately contact
your Toyota dealer.
The following may indicate that your vehicle is overheating.
● The high coolant temperature warning light ( P. 684) comes on
or flashes, or a loss of hybrid system power is experienced. (F or
example, the vehicle s peed does not increase.)
● “Hybrid System Overheated” is shown on the multi-information
display.
● Steam comes out from under the hood.
Correction procedures
1
2
3
1
2

815Alphabetical index
PRIUS_OM_OM47C35U_(U)
CleaningAluminum wheels.................. 587
Camera sensor ..................... 287
Exterior ................................. 586
Hybrid battery (traction
battery) air intake vent ........ 641
Interior................................... 592
Radar sensor ........................ 286
Seat belts .............................. 593
Water-repellent coating......... 587
Coat hooks ............................... 576
Combination meter .................... 98
Clock adjustment .................. 103
Main display .......................... 115
Multi-information display ....... 122
Warning lights and indicators ............................ 107
Condenser ................................ 614
Console box ............................. 552
Coolant ..................................... 612 Capacity ................................ 760
Checking ............................... 612
Preparing and checking before winter....................... 427
Cooling system ........................ 612 Engine overheating ............... 746
Hybrid system overheating ... 748
Consumption screen ....... 162, 169
Cruise control Cruise control........................ 330
Dynamic radar cruise control
with full-speed range .......... 314
Cup holders.............................. 553
Curtain shield airbags ............... 36
Customizable features ............ 780 Daytime running light
system.................................... 261
Deck board ............................... 557
Defogger Outside rear view
mirrors ........................ 530, 540
Rear window ................. 530, 540
Windshield .................... 530, 540
Dimension ................................ 754
Dinghy towing.......................... 240
Display BSM (Blind Spot Monitor) ..... 337
Drive information .................. 124
Dynamic radar cruise control with full-speed range .......... 314
Energy monitor ..... 125, 162, 169
Head-up display.................... 155
LDA (Lane Departure Alert with steering control) .......... 308
Multi-information display ....... 122
Parking assist
system ....... ................. 350, 377
Pre-collision warning ............ 291
Trip information..................... 117
Warning messages ............... 693
Do-it-yourself maintenance .... 602
Door courtesy lights ............... 548 Location ................................ 548
Wattage ................................ 764D

817Alphabetical index
PRIUS_OM_OM47C35U_(U)
Engine....................................... 756Accessory mode ................... 243
Compartment ........................ 608
Engine switch........................ 241
Exhaust gas precautions ........ 55
Hood ..................................... 605
How to start the hybrid system ......... ....................... 241
Identification number ............ 756
If the hybrid system will not start .............................. 735
If your vehicle has to be stopped in an emergency ... 671
Ignition switch
(power switch) .................... 241
Overheating .......................... 746
Power switch......................... 241
Engine coolant ......................... 612 Capacity ................................ 760
Checking ............................... 612
Preparing and checking before winter....................... 427
Engine oil ................................. 609
Capacity ................................ 758
Checking ............................... 609
Oil pressure warning light ..... 682
Preparing and checking before winter....................... 427
Engine switch .......................... 241 Auto power off function ......... 243
Changing the power
switch modes...................... 243
If your vehicle has to be
stopped in an
emergency.......................... 671
Starting the hybrid system .... 241 EPS (Electronic Power
Steering) ................................ 418
Function ................................ 418
Warning light......................... 683
EV indicator ............................. 127
EV drive mode ......................... 247
Event data recorder (EDR)........ 11
Exhaust gas precautions .......... 55
Flat tire ..................................... 721
Floor mats .................................. 26
Fluid Brake .................................... 761
Transmission ........................ 761
Washer ................................. 620
Fog lights
Replacing light bulbs ............ 667
Switch ................................... 268
Footwell lights ......................... 548
Front doors .............................. 181
Front fog lights Replacing light bulbs ............ 667
Switch ................................... 268
Front passenger occupant classification system .............. 50
Front passenger’s seat
belt reminder light................. 684
Front seats ............................... 200 Adjustment............................ 200
Cleaning ............................... 592
Correct driving posture ........... 28
Head restraints ..................... 205
Seat heaters ......................... 546
Front side marker lights Light switch ........................... 258
Replacing light bulbs ............ 661
Wattage ................................ 764
F

818Alphabetical index
PRIUS_OM_OM47C35U_(U)
Front turn signal lightsReplacing light bulbs............. 667
Turn signal lever ................... 256
Fuel Capacity ................................ 757
Fuel gauge ............................ 116
Information ............................ 765
Refueling............................... 278
Type ...................................... 757
Warning light ......................... 684
Fuel consumption............ 131, 167
Fuel filler door.......................... 278
Opener .................................. 280
Refueling............................... 278
When the fuel filler door cannot be opened............... 281
Fuses ........................................ 653
Garage door opener ................ 578
Glove box ................................. 552
Hands-free system
(for cellular phone)................ 484
Head restraints ........................ 205
Head-up display ....................... 155
Headlights ................................ 258 Automatic High Beam ........... 263
Headlight aim ................ 656, 804
Light switch ........................... 258
Replacing light bulbs............. 667
Heated steering wheel............. 546
Heaters
Automatic air conditioning system ....... ................. 526, 536
Heated steering wheel .......... 546
Outside rear view mirrors ........................ 530, 540
Seat heaters ......................... 546 High coolant temperature
warning light.......................... 684
High mounted stoplight Replacing.............................. 667
High-voltage components ........ 87
Hill-start assist control ........... 418
Hood ......................................... 605
Hooks
Cargo hooks ......................... 558
Coat hooks ........................... 576
Grocery bag hook ................. 559
Retaining hooks (floor mat) .... 26
Horn .......................................... 208
Hybrid battery (tr action battery)
Location .................................. 87
Specification ......................... 757
Hybrid battery
(traction battery)
air intake vent .................. 88, 641
Hybrid system............................ 83
Brake Override System ........ 225
Drive-Start Control ................ 226
Emergency shut off system .... 88
Energy monitor/consumption
screen ................ 125, 162, 169
EV drive mode ...................... 247
High voltage components ....... 87
Hybrid System Indicator ....... 127
Hybrid system precautions ..... 87
Hybrid vehicle driving tips ..... 424
If the hybrid system will not start .................................... 735
Overheating .......................... 746
Power switch ........................ 241
Regenerative braking ............. 85
Starting the hybrid system .... 241
Vehicle proximity notification system .......... ..................... ... 84
Hybrid System Indicator ......... 127
Hybrid transmission................ 250
G
H

821Alphabetical index
PRIUS_OM_OM47C35U_(U)
Multi-information display ........ 122Air conditioning system
settings screen ................... 144
Audio system-linked display ................................ 143
BSM (Blind Spot Monitor) ..... 337
Display contents ................... 122
Drive information................... 124
Driving assist system information.......................... 148
Dynamic radar cruise control
with full-speed range .......... 314
Energy monitor ..................... 125
Language .............................. 151
LDA (Lane Departure Alert with steering control) .......... 308
Navigation system-linked
display ................................ 143
Parking assist system ... 350, 377
Pre-collision warning............. 291
Settings display..................... 149
Warning message display..... 148
Navigation system
*
Noise from under vehicle............ 8
Odometer.................................. 117
Oil Engine oil .............................. 758
Opener Back door.............................. 187
Fuel filler door ....................... 280
Hood ..................................... 605
Outside rear view mirrors ....... 212
Adjustment ............................ 212
BSM (Blind Spot Monitor) ..... 337
Folding .................................. 212
Outside rear view mirror defoggers ................... 530, 540 Outside temperature
display.................................... 116
Overhead console ................... 555
Overheating ............................. 746
P position switch ..................... 251
Panic mode .............................. 177
Parking assist sensors Intuitive parking assist .......... 349
Parking Support Brake function............................... 360
S-APGS (Simple Advanced Parking Guidance
System) .............................. 373
Parking brake........................... 257 Operation .............................. 257
Parking brake engaged
warning buzzer ................... 257
Parking lights
Light switch ........................... 258
Replacing light bulbs .... 660, 667
Wattage ................................ 764
Parking lock ............................. 251
PCS (Pre-Collision System).... 291 Enabling/disabling the system .......... ...................... 295
Function ................................ 291
Warning light......................... 683
Personal lights......................... 548
Switch ................................... 549
Wattage ................................ 764
Power control unit coolant ..... 612
Capacity................................ 760
Checking............................... 612
Preparing and checking before winter ...................... 427
Radiator ................................ 614
N
O
P
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL”.