2015 TOYOTA PRIUS overheating

43
1-1. Hybrid system
1
Before driving
PRIUS_OM_OM47A17U_DVD_(U)
CAUTION
■
Hybrid battery (traction battery)
Your vehicle contains a sealed nickel-metal hydride battery. If disposed of
improperly, it is hazardous to the environment and there is a risk of severe
burns and electrical shock that may result in death or serious injury.
NOTICE
■Hybrid battery (traction battery) air vent
●Do not put foreign objects near the air vent. The hybrid battery (traction
battery) may overheat and be damaged.
● Clean the air vent regularly to prevent the hybrid battery (traction battery)
from overheating.
● Do not wet or allow foreign substances to enter the air vent as this may
cause a short circuit and damage the hybrid battery (traction battery).
● Do not carry large amounts of water such as water cooler bottles in the
vehicle. If water spills onto the hybrid battery (traction battery), the battery
may be damaged. Have the vehicle inspected by your Toyota dealer.
● If the rear seat belt becomes separated from the guide ( P. 104), it could
obstruct the hybrid battery (traction battery) air vent. Set the rear seat belt
into the guide to use.

192 2-1. Driving procedures
PRIUS_OM_OM47A17U_DVD_(U)
CAUTION
■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.

215
2-1. Driving procedures
PRIUS_OM_OM47A17U_DVD_(U)
2
When driving
Parking brake
■Parking brake engaged warning buzzer
P. 503
■ Usage in winter time
P. 323
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.
To set the parking brake, fully
depress the parking brake
pedal with your left foot while
depressing the brake pedal
with your right foot.
(Depressing the pedal again
releases the parking brake.)
U.S.A.
Canada

221
2-2. Instrument cluster
PRIUS_OM_OM47A17U_DVD_(U)
2
When driving
CAUTION
■
To prevent an accident
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. 561)
Do not place anything or attach a sticker
in front of the instrument cluster. The item
may obscure or obstruct the display, or
could reflect off the display, possibly
causing an accident.Instrument cluster

303
2-4. Using other
driving systems
PRIUS_OM_OM47A17U_DVD_(U)
2
When driving
■Sounds and vibrati ons caused by the ABS, brake assist, VSC and
TRAC
● A sound may be heard from the engine compartment when the hybrid
system is started, just after the vehicle begins to move, if the brake pedal
is depressed forcefully or repeatedly, or 1-2 minutes after the hybrid sys-
tem is stopped. 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 after the vehicle comes to a stop.
• The brake pedal may pulsate slightly after the ABS is activated.
• The brake pedal may move down slightly after the ABS is activated.
■ 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.
*: If the LKA (Lane-Keeping Assist) system (if equipped) cannot operate in this case, a warning message will be shown on the multi-information dis-
play.
■ Electric power steering system warning light (warning buzzer)
P. 5 1 1

376 3-5. Other interior features
PRIUS_OM_OM47A17U_DVD_(U)
CAUTION
■Burns
●Use caution when seating the following persons in a seat with the seat
heater on to avoid the possibility of burns:
• 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.)
● Do not cover the seat with anything when using the seat heater.
Using the seat heater with a blanket or cushion increases the temperature
of the seat and may lead to overheating.
● Do not use the seat heater more than necessary. Doing so may cause
minor burns or overheating.
NOTICE
■To prevent seat heater damage
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
Turn the seat heaters off when the hybrid system is off.

5
When trouble arises
561
5-2. Steps to take in an emergency
PRIUS_OM_OM47A17U_DVD_(U)
If your vehicle overheats
Correction procedures■ If the high coolant temperatur e warning light comes on or
flashes
Stop the vehicle in a safe place and turn off the air condition-
ing 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. 504) comes on
or flashes, or a loss of hybrid system power is experienced. (For
example, the vehicle s peed does not increase.)
● “HYBRID SYSTEM OVERHEAT” ( P. 525) is shown on the
multi-informat ion display.
● Steam comes out from under the hood.
STEP 1
STEP 2
STEP 3

632 Alphabetical index
PRIUS_OM_OM47A17U_DVD_(U)
Child safetyAirbag precautions ................150
Back door precautions ............96
Child restraint system............ 162
Child-protectors .......................89
How your child should wear the seat belt ........................ 112
Installing child restraints ........ 167
Power window lock switch..... 125
Power window precautions ... 127
Removed electronic key battery precautions ......................... 465
Seat belt extender precautions ......................... 117
Seat belt precautions ............ 113
Seat heater precautions ........ 376
12-volt battery precautions .... 443
Child-protectors .........................89
Cleaning
Exterior .................................. 404
Interior ................................... 407
Seat belts .............................. 408
Clock ......................................... 233
Condenser ................................ 435
Console box ............................. 365
Cooling system Engine overheating ............... 561
Hybrid system overheating.... 561
Cruise control Cruise control ........................ 269
Dynamic radar cruise control ................................. 273
Cup holders .............................. 366
Curtain shield airbags ............. 141
Customizable features............. 602 Daytime running light
system .................................... 256
Deck board ............................... 381
Defogger
Rear window ......................... 352
Side mirrors........................... 352
Dimensions .............................. 572
Dinghy towing .......................... 329
Display Dynamic radar cruise control ................................. 273
Multi-information ................... 226
Warning messages ............... 517
Do-it-yourself maintenance .... 419
Door lock Back door ................................ 94
Side doors ............................... 88
Smart key system .. ................. 63
Wireless remote control .......... 86
Doors Back door ................................ 94
Door glasses ......................... 125
Door lock ..................... 63, 86, 88
Rear door child-protector ........ 89
Side doors ............................... 88
Driver’s seat belt reminder light ......................................... 508
Driving
Break-in tips .......................... 183
Correct posture ..................... 139
Procedures............................ 182
Winter driving tips ................. 323D