2017 TOYOTA PRIUS PRIME heating

5046-1. Using the air conditioning system and defogger
PRIUS PRIME_OM_OM47A88U_(U)
■Heating
●In HV mode, the gasoline engine may operate in order to exhaust heat from
the engine coolant via the heater.
● In EV mode, heating is done by a heat pump system.
• When the outside temperature is low or it is snowing, compared to con-
ventional vehicles, heating may be less effective and warm air may not
come out.
• If frost has formed of the outside heat exchanger, the heating perfor- mance will decline. The frost can be removed from the outside heat
exchanger by operating the Remote Air Conditioning System before driv-
ing ( →P. 509). When frosted over, the heating operation of the Remote
Air Conditioning System starts after defrosting.
• When is turned on, the heating is controlled optimally. There- fore, the set heating performance may not be achieved even if the fan
speed setting is increased.
● In the following situations the gasoline engine may operate in order to
exhaust heat from the engine coolant via the heater even in EV mode.
• The outside temperature is extremely low
• is operating
■ Using automatic mode
Fan speed is adjusted automatically according to the temperature setting and
the ambient conditions.
Therefore, the fan may stop for a while until warm or cool air is ready to flow
immediately after is pressed.
■ Water droplets during air conditioning operation• When the outside heat exchanger is
frosted over, fan speed declines and it
may become harder to heat the inte-
rior. However, it is not a malfunction.
In this situation, the air temperature
from the outlets may not change even
though the set temperature is raised.
The outside heat exchanger, accumulator
and air conditioning piping may incur con-
densation or frost may form. During or
after the air conditioning operation, water
droplets may fall from the vehicle. How-
ever, it is not a malfunction.
Outside heat exchanger
Outside heat exchanger
Accumulator

5066-1. Using the air conditioning system and defogger
PRIUS PRIME_OM_OM47A88U_(U)■
Fresh air intake system while parking
When parking, the system automatically switches to outside air mode to
encourage better air circulation throughout the vehicle, helping to reduce
odors that occur when starting the vehicle.
■ Operation of the air conditioning system in the air conditioning eco
mode
●In the air conditioning eco mode, the air conditioning system is controlled as
follows to prioritize fuel efficiency:
• Engine speed and compressor operation controlled to restrict heating/
cooling capacity
• Fan speed restricted when automatic mode is selected
● To improve air conditioning performance, perform the following operations:
• Adjust the fan speed
• Adjust the temperature setting
• Turn off the air conditioning eco mode
● When the driving mode is set to Eco driving mode, the air conditioning eco
mode will be turned on automatically. Even in this case, the air conditioning
eco mode can be turned off by selecting . ( →P. 406)
■ When the outside temperat ure falls to nearly 32°F (0°C)
The dehumidification function may not operate even when is
selected.
■ Ventilation and air conditioning odors
●To let the fresh air in, set the air conditioning system to the outside air mode.
● During use, various odors from inside and outside the vehicle may enter into
and accumulate in the air conditioning system. This may then cause odor to
be emitted from the vents.
● In order to suppress odors that occur when the air conditioning system
starts, fresh air is automatically taken in when parked.
● To reduce potential odors from occurring, the start timing of the blower may
be delayed for a short period of time i mmediately after the air conditioning
system is started in automatic mode.
■ Air conditioning filter
→P. 620
■ Customization
Settings (e.g. A/C auto switching operation) can be changed. (Customizable
features: →P. 732)

5086-1. Using the air conditioning system and defogger
PRIUS PRIME_OM_OM47A88U_(U)
NOTICE
■Humidity sensor
● Do not spray the glass cleaner on the sensor or subject it to strong impacts
● Do not stick anything on the sensor
■ To prevent 12-volt battery discharge
Do not leave the air conditioning system on longer than necessary when the
hybrid system is off.
■ Air outlets
The air outlets become hot when used for heating. Therefore, use caution
and adjust the air outlets accordingly.
In order to detect fog on the windshield, a
sensor which monitors the temperature
of the windshield, the surround humidity,
etc. is installed. ( →P. 505)
Follow these points to avoid damaging
the sensor:
● Do not disassemble the sensor

5106-1. Using the air conditioning system and defogger
PRIUS PRIME_OM_OM47A88U_(U)
■Operating conditions
The system will only operate if all of the following conditions are met:
●The shift position is in P.
● The power switch is off.
*
●All doors are closed.
● The hood is closed.
*: The Remote Air Conditioning System cannot be used for approximately 3
minutes and a half after the power switch is turned off.
■ Remote Air Conditioning System automatic shut-off
The system will automatically shut off under the following conditions:
● About 10 minutes have passed since operation began
● Any one of the operating conditions is not met
The system may also shut off if the charge level of the hybrid battery (traction
battery) drops to low.
■ Conditions affecting operation
The system may not start in the following situations:
●The charge level of the hybrid battery (traction battery) is low
● The outside temperature is extremely low
● When the hybrid system is cool (for example, after being left for a lon\
g time
in low temperatures)
■ Windshield defogger
When defogging the windshield using the Remote Air Conditioning System,
defogging may be insufficient due to the power being restricted more than
during normal air conditioning operation. Also, the outside of the windshield
may fog up due to the outside temperature, humidity or air conditioning set
temperature.
■ Using the heater via the Remote Air Conditioning System
When the outside heat exchanger becomes frosted over, heating perfor-
mance may decline due to automatically switching to the frost removal op\
era-
tion.

513
PRIUS PRIME_OM_OM47A88U_(U)
6-1. Using the air conditioning system and defogger
6
Interior features
Heated steering wheel∗/seat heaters
∗: If equipped
Heated steering wheel and seat heaters heat the side grips of the
steering wheel and front seats, respectively.
WARNING
●Care should be taken to prevent injury if anyone in the following categories
comes in contact with the steering wheel and 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.

700
PRIUS PRIME_OM_OM47A88U_(U)
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. 655) comes on
or flashes, or a loss of hybrid system power is experienced. (For
example, the vehicle s peed does not increase.)
● “Hybrid System Overhe ated” is shown on the multi-information
display.
● Steam comes out from under the hood.
Correction procedures
1
2
3
1
2

769Alphabetical index
PRIUS PRIME_OM_OM47A88U_(U)
Clock ......................................... 180Adjustment ............................ 185
Coat hooks ............................... 540
Combination meter .................. 180 Clock adjustment .................. 185
Main display .......................... 196
Multi-information display ....... 205
Warning lights and
indicators ............................ 188
Condenser ................................ 586
Console box ............................. 519
Consumption screen ....... 250, 256
Coolant ..................................... 584 Capacity ................................ 714
Checking ............................... 584
Preparing and checking before winter....................... 482
Cooling system ........................ 584 Engine overheating ............... 700
Hybrid system overheating ... 702
Cruise control .......................... 391 Dynamic radar cruise control with full-speed range .......... 391
Cup holders.............................. 520
Curtain shield airbags ............... 36
Customizable features ............ 732
Daytime running light system .................................... 341
Deck board ............................... 523
Defogger Outside rear view
mirrors ........................ 491, 502
Rear window ................. 491, 502
Windshield .................... 491, 501 Dimension ................................ 708
Dinghy towing.......................... 323
Display
BSM (Blind Spot Monitor) ..... 408
Drive information .................. 207
Dynamic radar cruise control with full-speed range .......... 391
Energy monitor ..... 208, 247, 253
Head-up display.................... 238
Intelligent Clearance Sonar.................................. 435
Intuitive parking assist .......... 421
LDA (Lane Departure Alert with steering control) .......... 385
Main display.......................... 196
Multi-information display ....... 205
Pre-collision warning ............ 369
S-APGS (Simple Advanced Parking Guidance
System) .............................. 446
Warning messages ............... 663
Do-it-yourself maintenance .... 574
Door courtesy lights ............... 515 Location ................................ 515
Wattage ................................ 717
Doors ................................ 267, 273 Automatic door locking
and unlocking system......... 270
Back door ............................. 273
Door glasses......................... 300
Door lock .............................. 267
Open door warning buzzer ... 655
Open door warning light ....... 655
Outside rear view mirrors ..... 298
Rear door child-protectors .... 270
Side doors ............................ 267
Side windows........................ 300
D
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL”.

770Alphabetical index
PRIUS PRIME_OM_OM47A88U_(U)
Drive information ..................... 207
Drive-Start Control .................. 308
Driver’s seat belt reminder light......................................... 656
Driving ...................................... 306
Break-in tips .......................... 309
Correct posture ....................... 28
Driving in the rain .................. 307
Driving mode select switch ... 406
Plug-in hybrid vehicle driving tips ........................................ 97
Procedures ........................... 306
Winter drive tips .................... 482
Dynamic radar cruise control
with full-speed range ............ 391
ECB (Electronically Controlled Brake System) .... 476
Eco drive mode ........................ 406
EDR (Event data recorder) ........ 11
Electric motor (traction motor) ....................... 78
Location .................................. 78
Specification ......................... 711
Electric Power Steering (EPS)....................................... 477
Function ................................ 477
Warning light ......................... 654
Electronic key .......................... 262
Battery-saving function ......... 280
If the electronic key does not operate properly ........... 690
Replacing the battery ............ 627
Electronically Controlled Brake System (ECB) ............. 476 Emergency, in case of
If a warning buzzer sounds... 653
If a warning light turns on ..... 653
If a warning message is displayed ............................ 663
If the 12-volt battery is discharged.......................... 694
If the electronic key does
not operate properly ........... 690
If the hybrid system will not start .............................. 688
If you have a flat tire ............. 671
If you lose your keys ..... 263, 266
If you think something is wrong .............................. 652
If your vehicle becomes stuck ................................... 705
If your vehicle has to be stopped in an emergency ... 645
If your vehicle needs to be
towed.................................. 646
If your vehicle overheats....... 700
Emergency flashers ................ 644
Emergency tire puncture
repair kit ................................. 671
Energy monitor ........ 208, 247, 253
Engine Accessory mode ................... 326
Compartment ........................ 580
Engine switch ....................... 324
Exhaust gas precautions ........ 56
Hood ..................................... 577
How to start the hybrid system .......... ...................... 324
Identification number ............ 710
If the hybrid system will not start .............................. 688
If your vehicle has to be stopped in an emergency ... 645
Ignition switch (power switch) .................... 324
Overheating .......................... 700
Power switch ........................ 324
E