overheating TOYOTA PRIUS PRIME 2020 Owners Manual (in English)

120
PRIUS PRIME_OM_OM47C77U_(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 Ci rcuit
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 ab normalities
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, possib ly resulting in
death or serious injury.
■ When not using the charg ing 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_OM47C77U_(U)
3. Instrument cluster
■BSM (Blind Spot Monitor) outsid e rear view mirror indicators
(if equipped) ( P. 421)
• 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 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. 709)

PRIUS PRIME_OM_OM47C77U_(U)
3275-1. 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 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.

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PRIUS PRIME_OM_OM47C77U_(U)
5-2. Driving procedures
5
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. 319
■ 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. 496
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.

492
PRIUS PRIME_OM_OM47C77U_(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 brak e pedal
is operated.
● Motor sound of the brake system heard from the front part of th e vehicle
when the driver’s door is opened.
● Operating sound heard from the engine compartment when one or t wo min-
utes passed after the stop of the hybrid system.
■ EPS operation sound
When the steering wheel is operated, a motor sound (whirring so und) 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 wh en vehicle
speed increases
If both the TRAC and VSC systems are turned off, automatic re-e nabling
will not occur when vehicle speed increases.
■ 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. 663

709
PRIUS PRIME_OM_OM47C77U_(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
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. 664) 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

777Alphabetical index
PRIUS PRIME_OM_OM47C77U_(U)
Clock ......................................... 192Adjustment ............................ 197
Coat hooks ............................... 553
Combination meter .................. 192 Clock adjustment .................. 197
Main display .......................... 209
Multi-information display ....... 218
Warning lights and
indicators ............................ 201
Condenser ................................ 594
Console box ............................. 532
Consumption screen ....... 263, 269
Coolant ..................................... 592 Capacity ................................ 723
Checking ............................... 592
Preparing and checking before winter....................... 495
Cooling system ........................ 592 Engine overheating ............... 709
Hybrid system overheating ... 711
Cruise control Dynamic radar cruise control with full-speed range .......... 403
Cup holders.............................. 533
Curtain shield airbags ............... 36
Customizable features ............ 741
Daytime running light system .................................... 353
Deck board ............................... 536
Defogger Outside rear view
mirrors ........................ 504, 515
Rear window ................. 504, 515
Windshield .................... 504, 514 Dimension ................................ 718
Dinghy towing.......................... 335
Display
BSM (Blind Spot Monitor) ..... 421
Drive information .................. 220
Dynamic radar cruise control with full-speed range .......... 403
Energy monitor ..... 221, 260, 266
Head-up display.................... 251
Intuitive parking assist .......... 434
LDA (Lane Departure Alert
with steering control) .......... 397
Main display.......................... 209
Multi-information display ....... 218
Parking Support Brake function............................... 448
Pre-collision warning ............ 381
S-APGS (Simple Advanced
Parking Guidance
System) .............................. 459
Warning messages ............... 672
Do-it-yourself maintenance .... 582
Door courtesy lights ............... 528 Location ................................ 528
Wattage ................................ 726
Doors ................................ 279, 285 Automatic door locking
and unlocking system......... 282
Back door ............................. 285
Door glasses......................... 312
Door lock .............................. 279
Open door warning buzzer ... 283
Open door warning light ....... 664
Outside rear view mirrors ..... 310
Rear door child-protectors .... 282
Side doors ............................ 279
Side windows........................ 312
D
*: Refer to “MULTIMEDIA OWNER’S MANUAL”.

779Alphabetical index
PRIUS PRIME_OM_OM47C77U_(U)
EngineAccessory mode ................... 338
Compartment ........................ 588
Engine switch........................ 336
Exhaust gas precautions ........ 56
Hood ..................................... 585
How to start the hybrid system ......... ....................... 336
Identification number ............ 720
If the hybrid system will not start .................................... 697
If your vehicle has to be stopped in an emergency ... 653
Ignition switch (power
switch) ................................ 336
Overheating .......................... 709
Power switch......................... 336
Engine coolant ......................... 592 Capacity ................................ 723
Checking ............................... 592
Preparing and checking before winter....................... 495
Engine oil ................................. 589
Capacity ................................ 722
Checking ............................... 589
Oil pressure warning light ..... 662
Preparing and checking before winter....................... 495
Engine switch (power switch) .................................... 336
Auto power off function ......... 338
Changing the power switch modes................................. 338
If your vehicle has to be stopped in an emergency ... 653
Starting the hybrid system .... 336 EPS (Electronic Power
Steering) ................................ 490
Function ................................ 490
Warning light......................... 663
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 ..................................... 680
Floor mats .................................. 26
Fluid Brake .................................... 725
Transmission ........................ 724
Washer ................................. 600
Fog lights ................................. 360
Replacing light bulbs ............ 648
Switch ................................... 360
Footwell lights ......................... 528
Front doors .............................. 279
Front fog lights ........................ 360
Replacing light bulbs ............ 648
Switch ................................... 360
Front passenger occupant classification system .............. 50
Front passenger’s seat
belt reminder light................. 664
F

781Alphabetical index
PRIUS PRIME_OM_OM47C77U_(U)
Hybrid battery (traction battery) ..................................... 98
Air intake vent ......................... 99
Charging ............................... 110
Location .................................. 98
Specification ......................... 721
Status indicator ..................... 112
Hybrid battery (traction
battery) air intake vent ............ 99 Cleaning................................ 570
Hybrid system ............................ 86
Brake Override System......... 320
Consumption screen................. 231, 263, 269
Drive-Start Control ................ 320
Emergency shut off system .... 99
Energy monitor ..... 221, 260, 266
High voltage components ....... 98
Hybrid System Indicator........ 223
If the hybrid system will not start .................................... 697
Overheating .......................... 709
Plug-in hybrid system precautions ........................... 98
Plug-in hybrid vehicle driving tips ...................................... 105
Power switch......................... 336
Regenerative braking.............. 94
Starting the hybrid system .... 336
Vehicle proximity notification
system ......... ......................... 93
Hybrid System Indicator ......... 223
Hybrid transmission ................ 342 I/M test ...................................... 581
Identification ............................ 719
Engine .................................. 720
Vehicle .................................. 719
Ignition switch (power
switch).................................... 336 Auto power off function ......... 338
Changing the power switch modes ................................ 338
If your vehicle has to be stopped in an emergency ... 653
Starting the hybrid system .... 336
Illuminated entry system ........ 530
Immobilizer system ................... 83
Indicators ................................. 201
Initialization.............................. 752 Items to initialize ................... 752
Maintenance data ................. 576
Parking Support Brake function............................... 452
Power windows..................... 313
S-APGS (Simple Advanced Parking Guidance
System) .............................. 479
Tire pressure warning system .......... ...................... 604
Inside rear view mirror ............ 308
Instrument cluster light
control .................................... 194
Interior lights ........................... 528
Switch ........................... 529, 530
Wattage ................................ 726
Intuitive parking assist ........... 433I
*: Refer to “NAVIGATION SYSTEM OWNER’S MANUAL” or “MULTIMEDIA OWNER’S MANUAL”.

783Alphabetical index
PRIUS PRIME_OM_OM47C77U_(U)
Main display ............................. 209
MaintenanceDo-it-yourself maintenance ... 582
General maintenance ........... 578
Maintenance data ................. 718
Maintenance requirements ... 575
Malfunction indicator lamp ..... 662
Master warning light................ 672
Meter ......................................... 192 Clock adjustment .................. 197
Combination meter ............... 192
Head-up display .................... 251
Indicators .............................. 204
Instrument cluster light control................................. 194
Main display .......................... 209
Multi-information display ....... 218
Warning lights ....................... 202
Warning messages ............... 672
Microphone
*1, 2......................... 76
Mirrors Inside rear view mirror .......... 308
Outside rear view mirror defoggers ................... 504, 515
Outside rear view mirrors...... 310
Vanity mirrors........................ 540
MP3 disc
*1
Multi-information display ........ 218
Air conditioning system settings screen ................... 239
Audio system-linked display ................................ 238
BSM (Blind Spot Monitor) ..... 421
Display contents ................... 218
Drive information................... 220
Driving assist system
information.......................... 243
Dynamic radar cruise control with full-speed range .......... 403 Energy monitor ..................... 221
Intuitive parking assist .......... 434
Language.............................. 246
LDA (Lane Departure Alert
with steering control) .......... 397
Navigation system-linked display ................................ 238
Parking Support Brake
function............................... 448
Pre-collision warning ............ 381
S-APGS (Simple Advanced Parking Guidance
System) .............................. 459
Settings................................. 244
Warning message................. 243
Navigation system
*2
Noise from under vehicle ........... 8
Odometer ................................. 211
Oil Engine oil .............................. 722
Opener Back door ............................. 285
Fuel filler door ....................... 370
Garage door ......................... 555
Hood ..................................... 585
Outside rear view mirrors ....... 310
Adjustment............................ 310
BSM (Blind Spot Monitor) ..... 421
Folding .................................. 310
Outside rear view mirror defoggers ................... 504, 515
Outside temperature
display.................................... 209
Overhead console ................... 535
Overheating ............................. 709
M
N
O
*1: Refer to “MULTIMEDIA OWNER’S MANUAL”.
*2: Refer to “NAVIGATION S YSTEM OWNER’S MANUAL”.