2020 TOYOTA PRIUS C overheating

871-3. Hybrid system
1
For safety and security
PRIUS c_U
NOTICE
■Hybrid battery (traction battery) air intake vent
● Do not place objects that will block the air intake vent. When the air intake
vent is blocked, the battery operations will be restricted and cause a
decline in fuel consumption.
● Clean the air intake vent regularly to prevent the hybrid batte ry (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 b attery).
● Do not carry large amounts of water such as water cooler bottle s in the
vehicle. If water spills onto the hybrid battery (traction batt ery), the battery
may be damaged. Have the vehicle inspected by your Toyota deale r.
● There is a filter installed to the air intake vent. When the fi lter remains
noticeably dirty even after cleaning the air intake vent, filte r cleaning or
replacement is recommended. For information regarding filter cl eaning or
replacement, contact your Toyota dealer.
● If “MAINTENANCE REQUIRED FOR TRACTION BATTERY COOLING
PARTS SEE OWNER’S MANUAL” is shown on the multi-information dis -
play, the air intake vent and filter may be clogged. Refer to P . 404 for infor-
mation on how to clean the air intake vent.

1022. Instrument cluster
PRIUS c_U
NOTICE
■To prevent damage to the engine and its components
This vehicle is not installed with an engine coolant temperatur e gauge.
Instead, is shown on the multi-information display. The engine may
be overheating if is shown on the multi-information display. I n this
case, immediately stop the vehicle in a safe place. ( P. 529)

1794-1. Before driving
4
Driving
PRIUS c_U
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 ma y cause
one side of the vehicle to brake differently than the other sid e. Also, the
parking brake may not securely hold the vehicle.
● If the electronically controlled brake system does not operate, do not fol-
low other vehicles closely and avoid hills or sharp turns that require brak-
ing.
In this case, braking is still possible, but the brake pedal sh ould be
depressed more firmly than usual. Also, the braking distance wi ll 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 t his 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 tim e during
driving, as this may restrain the hybrid system output.
● 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 lever to P. F ailure to do so
may cause the vehicle to move or the vehicle may accelerate sud denly if
the accelerator pedal is accidentally depressed.

1954-2. Driving procedures
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Driving
PRIUS c_U■
Notes for the entry function
P. 144
■ If the hybrid system does not start
●The immobilizer system may not have been deactivated. ( P. 88)
Contact your Toyota dealer.
■ 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 overheating prevention
To prevent the steering lock motor from overheating, the motor may be sus-
pended 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. ● Check that the shift lever is securely set
in P. The hybrid system may not start if
the shift lever is not securely in the P
position. “SHIFT INTO P POSITION TO
START” will be displayed on the multi-
information display.
“STEERING LOCK ACTIVE” will be dis-
played on the multi-information display.
Check that the shift lever is set in P.
Press the power switch while turning the
steering wheel left and right.

2074-2. Driving procedures
4
Driving
PRIUS c_U
To set the parking brake, fully
pull the parking brake lever
while depressing the brake
pedal.
To release the parking brake,
slightly raise the lever and
lower it completely while press-
ing the button.
■Parking the vehicle
P. 172
■ Parking brake engaged warning buzzer
A buzzer will sound if the vehicle is driven at a speed of appr oximately 3 mph
(5 km/h) or more with the parking brake engaged. ( P. 481, 492)
■ Usage in winter time
P. 274
Parking brake
Operating instructions
U.S.A. Canada
1
2
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.

2684-6. Using the driving support systems
PRIUS c_U■
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.
■ 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. 484
■ 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 to the “LOCK” position (vehicles without a
smart key system) or the power switch is turned off (vehicles with a smart
key system)
● 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.

5298-2. Steps to take in an emergency
8
When trouble arises
PRIUS c_U
● ( P. 489) is shown on the mu lti-information display.
● The hybrid system overheat warning message ( P. 493) is shown
on the multi-information display.
● Steam comes out f rom under the hood.
■If is shown on the mult i-information display
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 fan
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

589Alphabetical index
PRIUS c_U
Child safetyAirbag precautions .................. 42
Child-protectors .................... 131
Child restraint system ............. 59
How your child should
wear the seat belt ................. 34
Installing child restraints ......... 59
Moon roof precautions .......... 169
Power window lock switch .... 163
Power window precautions ... 166
Removed key battery precautions ......................... 453
Seat belt extender precautions ........................... 38
Seat belt precautions .............. 36
Seat heater precautions........ 384
12-volt battery precautions ................. 433, 528
Cleaning Exterior ................................. 400
Interior................................... 403
Seat belts .............................. 406
Clock ......................................... 108
Coat hooks ............................... 395
Condenser ................................ 428
Console box ............................. 389
Cooling system
Hybrid system overheating ... 529
Cord hook................................. 284
Cruise control .......................... 251
Cup holders.............................. 391
Curtain shield airbags ............... 40
Customizable features ............ 560 Daytime running light
system.................................... 210
Defogger Rear window ......................... 378
Side mirrors .......................... 378
Dimension ................................ 536
Dinghy towing.......................... 187
Display Energy flow ........................... 112
Multi-information display ....... 103
Trip information..................... 103
Warning message................. 488
Do-it-yourself maintenance .... 416
Doors Back door ............................. 136
Door lock .............................. 130
Door windows ....................... 163
Rear door child protector ...... 131
Side doors ............................ 127
Side mirrors .......................... 161
Driver’s seat belt reminder light ........................................ 482
Driving
Break-in tips.......................... 174
Correct posture ....................... 28
Procedures ........................... 172
Winter driving tips ................. 274D