2018 TOYOTA PRIUS PLUG-IN HYBRID overheating

1352-2. Charging
2
Plug-in hybrid system
PRIUS PHV_OM_OM47C99E_(EE)
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 socket has not been damaged
● The plug can be securely inserted into the socket
● 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 socket before inspecting it. If any abnormalities
are found in the charging cable as a result of the inspection, immediately
stop use and consult any authorized Toyota retailer or Toyota authorized
repairer, or any reliable repairer.
■ 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 oc cur during charging, possibly resulting in
death or serious injury.
■ When not using the charging cable for a long time
Remove the plug from the socket. Dust could accumulate on the plug or in
the socket, possibly causing overheating which could lead to a fire.
Also, keep the cable in a place free from moisture.

2143. Instrument cluster
PRIUS PHV_OM_OM47C99E_(EE)
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 any authorized
Toyota retailer or Toyota authorized repairer, or any reliable repairer imme-
diately 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. 718)

3455-1. Before driving
PRIUS PHV_OM_OM47C99E_(EE)
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.

3645-2. Driving procedures
PRIUS PHV_OM_OM47C99E_(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. 337
■ 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 5 km/h [3 mph]).
■ Usage in winter time
 P. 526
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.

5215-5. Using the driving support systems
PRIUS PHV_OM_OM47C99E_(EE)
5
Driving
■Sounds and vibrations caused by the ABS, brake assist, VSC, TRC and
hill-start assist control systems
●A sound may be heard from the engine compartment when the brake pedal
is depressed repeatedly, when the hybrid system is started or just after the
vehicle begins to move. This sound does not indicate that a malfunction has
occurred in any of these systems.
●Any of the following conditions may occur when the above systems are
operating. 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 also after the vehicle comes to a stop.
■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.
■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. 672
■Automatic reactivation of TRC and VSC systems
After turning the TRC and VSC systems off, the systems will be automatically
re-enabled in the following situations:
●When the power switch is turned off
●If only the TRC system is turned off, the TRC will turn on when vehicle
speed increases
If both the TRC and VSC systems are turned off, automatic re-enabling will
not occur when vehicle speed increases.

5466-1. Using the air conditioning system and defogger
PRIUS PHV_OM_OM47C99E_(EE)
Seat heaters
Seat heaters heat the front seats.
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.

7188-2. Steps to take in an emergency
PRIUS PHV_OM_OM47C99E_(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. 673) 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
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3
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757Alphabetical index
PRIUS PHV_OM_OM47C99E_(EE)
Child-protectors ....................... 280
Cleaning............................ 572, 577
Aluminum wheels .................. 573
Camera sensor ..................... 387
Exterior.................................. 572
Interior ................................... 577
Radar sensor ........................ 386
Seat belts .............................. 580
Water-repellent coating ......... 573
Clock ......................................... 198
Adjustment ............................ 204
Coat hooks ............................... 569
Combination meter .................. 198
Clock adjustment .................. 204
Main display .......................... 215
Multi-information display ....... 223
Warning lights and
indicators ............................ 207
Condenser ................................ 598
Console box ............................. 552
Consumption screen ............... 268
Coolant ..................................... 596
Capacity ................................ 732
Checking ............................... 596
Preparing and checking
before winter....................... 525
Cooling system ........................ 596
Engine overheating ............... 718
Hybrid system overheating ... 720
Cruise control .......................... 422
Dynamic radar cruise
control with full-speed
range .................................. 422
Cup holders .............................. 553
Curtain shield airbags ............... 39
Customizable features ............ 738Daytime running light
system .................................... 366
Deck board ............................... 556
Defogger
Outside rear view mirrors...... 535
Rear window ......................... 535
Windshield ............................ 535
Dimension ................................ 726
Display
BSM (Blind Spot Monitor) ..... 442
Drive information................... 225
Dynamic radar cruise
control with full-speed
range .................................. 422
Energy monitor ............. 226, 265
Head-up display .................... 257
Intelligent Clearance
Sonar.................................. 476
LDA (Lane Departure Alert
with steering control) .......... 411
Main display .......................... 215
Multi-information display ....... 223
Pre-crash warning................. 395
RSA (Road Sign Assist)........ 418
S-IPA (Simple Intelligent
Parking Assist System) ...... 487
Toyota parking assist
sensor................................. 460
Warning messages ............... 680
Do-it-yourself maintenance .... 586
Door courtesy lights................ 548
Location ................................ 548
Wattage ................................ 735D