overheating TOYOTA PRIUS PRIME 2021 Owners Manual (in English)

120
PRIUS PRIME_OM_OM47D71U_(U)
2-2. Charging
For safety, inspect the charging cable on a routine basis.
Inspecting and maintaining the charging cable
WARNING
■Routine inspection
Check the following points regularly.
Failure to do so may cause an unexpected accident, resulting in death or
serious injury.
●The charging cable, plug, charging connector, CCID (Charging Circuit
Interrupting Device) etc. have not been damaged
●The outlet has not been damaged
●The plug can be securely inserted into the outlet
●The plug does not get extremely hot during use
●The tip of the plug has not been deformed
●The plug is not dirtied by dust etc.
Remove the plug from the outlet before inspecting it. If any abnormalities
are found in the charging cable as a result of the inspection, immediately
stop use and consult your Toyota dealer.
■Maintaining the charging cable
When the charging cable is dirty, first remove the dirt with a hard, wringed
cloth, and then wipe the cable with a dry cloth.
However, never wash it with water. If the charging cable is washed with
water, fire or electric shock may occur during charging, possibly resulting in
death or serious injury.
■When not using the charging cable for a long time
Remove the plug from the outlet. Dust could accumulate on the plug or in
the outlet, possibly causing overheating which could lead to a fire.
Also, keep the cable in a place free from moisture.

208
PRIUS PRIME_OM_OM47D71U_(U)
3. Instrument cluster
■BSM (Blind Spot Monitor) outside rear view mirror indicators
(if equipped) (P. 432)
• When the BSM function is enabled on the screen of the multi-infor-
mation display, the power switch is turned to ON mode.
If the system is functioning correctly, the BSM outside rear view mirror indi-
cators will turn off after a few seconds.
If the BSM outside rear view mirror indicators do not illuminate or do not
turn off, there may be a malfunction in the system.
If this occurs, have the vehicle inspected by your Toyota dealer. ●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 light 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 vehicle in a
safe place, and check the engine after it has cooled completely. (P. 721)

PRIUS PRIME_OM_OM47D71U_(U)
3295-1. Before driving
5
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 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.

352
PRIUS PRIME_OM_OM47D71U_(U)
5-2. Driving procedures
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. 321
■Parking brake engaged warning buzzer
A buzzer will sound if the vehicle is driven with the parking brake 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. 508
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 brake components
overheating, which may affect braking performance and increase brake
wear.

504
PRIUS PRIME_OM_OM47D71U_(U)
5-5. Using the driving support systems
■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 one or two min-
utes 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.
■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.
■Electric power steering system warning light (warning buzzer)
P. 675

721
PRIUS PRIME_OM_OM47D71U_(U)
8
When trouble arises
8-2. Steps to take in an emergency
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
your Toyota dealer.
The following may indicate that your vehicle is overheating.
●The high coolant temperature warning light (P. 676) comes on
or flashes, or a loss of hybrid system power is experienced. (For
example, the vehicle speed 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

791Alphabetical index
PRIUS PRIME_OM_OM47D71U_(U)
Radar sensor ........................ 378
Seat belts .............................. 584
Water-repellent coating......... 577
Clock ......................................... 192
Adjustment ............................ 197
Coat hooks ............................... 566
Combination meter .................. 192
Clock adjustment .................. 197
Main display .......................... 209
Multi-information display ....... 220
Warning lights and
indicators ............................ 201
Condenser ................................ 606
Console box ............................. 545
Consumption screen ....... 265, 271
Coolant ..................................... 604
Capacity ................................ 735
Checking ............................... 604
Preparing and checking
before winter....................... 507
Cooling system ........................ 604
Engine overheating ............... 721
Hybrid system overheating ... 723
Cruise control
Dynamic radar cruise control
with full-speed range .......... 414
Cup holders.............................. 546
Curtain shield airbags ............... 36
Customizable features ............ 753
Daytime running light
system .................................... 356
Deck board ............................... 549
Defogger
Outside rear view
mirrors ........................ 516, 527
Rear window ................. 516, 527
Windshield .................... 515, 527Dimension ................................ 730
Dinghy towing.......................... 337
Display
BSM (Blind Spot Monitor) ..... 432
Drive information .................. 222
Dynamic radar cruise control
with full-speed range .......... 414
Energy monitor ..... 223, 262, 268
Head-up display.................... 253
Intuitive parking assist .......... 446
LTA (Lane Tracing Assist) .... 404
Main display.......................... 209
Multi-information display ....... 220
Parking Support Brake
function............................... 460
Pre-collision warning ............ 385
RSA (Road Sign Assist) ....... 411
S-APGS (Simple Advanced
Parking Guidance
System) .............................. 471
Warning messages ............... 684
Do-it-yourself maintenance .... 594
Door courtesy lights ............... 541
Location ................................ 541
Wattage ................................ 738
Doors ................................ 281, 287
Automatic door locking
and unlocking system......... 284
Back door ............................. 287
Door glasses......................... 314
Door lock .............................. 281
Open door warning buzzer ... 285
Open door warning light ....... 676
Outside rear view mirrors ..... 312
Rear door child-protectors .... 284
Side doors ............................ 281
Side windows........................ 314
D
*: Refer to “MULTIMEDIA OWNER’S MANUAL”.

793Alphabetical index
PRIUS PRIME_OM_OM47D71U_(U)
Engine
Accessory mode ................... 340
Compartment ........................ 600
Engine switch........................ 338
Exhaust gas precautions ........ 56
Hood ..................................... 597
How to start the hybrid
system ................................ 338
Identification number ............ 732
If the hybrid system will not
start .................................... 709
If your vehicle has to be
stopped in an emergency ... 665
Ignition switch (power
switch) ................................ 338
Overheating .......................... 721
Power switch......................... 338
Engine coolant ......................... 604
Capacity ................................ 735
Checking ............................... 604
Preparing and checking
before winter....................... 507
Engine oil ................................. 601
Capacity ................................ 734
Checking ............................... 601
Oil pressure warning light ..... 674
Preparing and checking
before winter....................... 507
Engine switch (power
switch) .................................... 338
Auto power off function ......... 340
Changing the power switch
modes................................. 340
If your vehicle has to be
stopped in an emergency ... 665
Starting the hybrid system .... 338EPS (Electronic Power
Steering) ................................ 502
Function ................................ 502
Warning light......................... 675
EV auto mode ............................ 87
EV driving range ...................... 108
EV mode ..................................... 87
EV/HV mode selection
switch ....................................... 90
Event data recorder (EDR)........ 11
Exhaust gas precautions .......... 56
Flat tire ..................................... 692
Floor mats .................................. 26
Fluid
Brake .................................... 737
Transmission ........................ 736
Washer ................................. 612
Fog lights ................................. 363
Replacing light bulbs ............ 660
Switch ................................... 363
Footwell lights ......................... 541
Front doors .............................. 281
Front fog lights ........................ 363
Replacing light bulbs ............ 660
Switch ................................... 363
Front passenger occupant
classification system .............. 50
Front passenger’s seat
belt reminder light................. 677
Front seat concentrated
airflow mode
(S-FLOW) ....................... 514, 526
F

795Alphabetical index
PRIUS PRIME_OM_OM47D71U_(U)
Hybrid battery (traction
battery) ..................................... 98
Air intake vent ......................... 99
Charging ............................... 110
Location .................................. 98
Specification ......................... 733
Status indicator ..................... 112
Hybrid battery (traction
battery) air intake vent ............ 99
Cleaning................................ 582
Hybrid system ............................ 86
Brake Override System......... 322
Consumption
screen................. 233, 265, 271
Drive-Start Control ................ 322
Emergency shut off system .... 99
Energy monitor ..... 223, 262, 268
High voltage components ....... 98
Hybrid System Indicator........ 225
If the hybrid system will not
start .................................... 709
Overheating .......................... 721
Plug-in hybrid system
precautions ........................... 98
Plug-in hybrid vehicle driving
tips ...................................... 105
Power switch......................... 338
Regenerative braking.............. 94
Starting the hybrid system .... 338
Vehicle proximity notification
system .................................. 93
Hybrid System Indicator ......... 225
Hybrid transmission ................ 345I/M test ...................................... 593
Identification ............................ 731
Engine .................................. 732
Vehicle .................................. 731
Ignition switch (power
switch).................................... 338
Auto power off function ......... 340
Changing the power switch
modes ................................ 340
If your vehicle has to be
stopped in an emergency ... 665
Starting the hybrid system .... 338
Illuminated entry system ........ 543
Immobilizer system ................... 83
Indicators ................................. 201
Initialization.............................. 765
Items to initialize ................... 765
Maintenance data ................. 588
Parking Support Brake
function............................... 464
Power windows..................... 315
S-APGS (Simple Advanced
Parking Guidance
System) .............................. 491
Tire pressure warning
system ................................ 616
Inside rear view mirror ............ 310
Instrument cluster light
control .................................... 194
Interior lights ........................... 541
Switch ........................... 542, 543
Wattage ................................ 738
Intuitive parking assist ........... 445I
*: Refer to “NAVIGATION SYSTEM OWNER’S MANUAL” or
“MULTIMEDIA OWNER’S MANUAL”.

797Alphabetical index
PRIUS PRIME_OM_OM47D71U_(U)
Main display ............................. 209
Maintenance
Do-it-yourself maintenance ... 594
General maintenance ........... 590
Maintenance data ................. 730
Maintenance requirements ... 587
Malfunction indicator lamp ..... 674
Master warning light................ 684
Meter ......................................... 192
Clock adjustment .................. 197
Combination meter ............... 192
Head-up display .................... 253
Indicators .............................. 204
Instrument cluster light
control................................. 194
Main display .......................... 209
Multi-information display ....... 220
Warning lights ....................... 202
Warning messages ............... 684
Microphone
*1, 2......................... 76
Mirrors
Inside rear view mirror .......... 310
Outside rear view mirror
defoggers ................... 516, 527
Outside rear view mirrors...... 312
Vanity mirrors........................ 553
MP3 disc
*1
Multi-information display ........ 220
Air conditioning system
settings screen ................... 241
Audio system-linked
display ................................ 240
BSM (Blind Spot Monitor) ..... 432
Display contents ................... 220
Drive information................... 222
Driving assist system
information.......................... 245
Dynamic radar cruise control
with full-speed range .......... 414Energy monitor ..................... 223
Intuitive parking assist .......... 446
Language.............................. 248
LTA (Lane Tracing Assist) .... 404
Navigation system-linked
display ................................ 240
Parking Support Brake
function............................... 460
Pre-collision warning ............ 385
RSA (Road Sign Assist) ....... 411
S-APGS (Simple Advanced
Parking Guidance
System) .............................. 471
Settings................................. 246
Warning message................. 245
Navigation system
*2
Noise from under vehicle ........... 8
Odometer ................................. 213
Oil
Engine oil .............................. 734
Opener
Back door ............................. 287
Fuel filler door ....................... 373
Garage door ......................... 568
Hood ..................................... 597
Outside rear view mirrors ....... 312
Adjustment............................ 312
BSM (Blind Spot Monitor) ..... 432
Folding .................................. 312
Outside rear view mirror
defoggers ................... 516, 527
Outside temperature
display.................................... 209
Overhead console ................... 548
Overheating ............................. 721
M
N
O
*1: Refer to “MULTIMEDIA OWNER’S MANUAL”.
*2: Refer to “NAVIGATION SYSTEM OWNER’S MANUAL”.