TOYOTA PRIUS PLUG-IN HYBRID 2018 Owners Manual

5316-1. Using the air conditioning system and defogger
PRIUS PHV_OM_OM47C99E_(EE)
6
Interior features
■Fan speed setting
Move the fan speed setting
knob upwards to increase the
fan speed and downwards to
decrease the fan speed.
The fan speed is shown on the
display. (7 levels)
Press to turn the fan off.
■Change the airflow mode
Move the airflow change knob
upwards or downwards to
change the airflow mode.
The air outlets used are
switched each time the knob is
operated.
Air flows to the upper body
Air flows to the upper body
and feet
Air flows to the feet
Air flows to the feet and the
windshield defogger oper-
ates
Fan speed
setting knob
Airflow change
knob
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5326-1. Using the air conditioning system and defogger
PRIUS PHV_OM_OM47C99E_(EE)■
S-FLOW mode
In S-FLOW mode, priority for the airflow is given to the front seats,
reducing the airflow and air conditioning effect on the rear seats.
When a passenger is not detected in the front passenger seat,
depending on the set temperature and ambient temperature, prior-
ity for the airflow will be given to the driver’s seat only.
However, air will always be blown from the side outlet of the front pas-
senger seat.
The following S-FLOW modes are available:
Automatic S-FLOW mode
The system determines whether or not a rear passenger is in the
vehicle by the opening and closing of a rear door. When a rear pas-
senger is determined to be in the vehicle, S-FLOW mode will be
automatically disabled.
To enable S-FLOW mode again, press and enter manual
S-FLOW mode. (P. 538)
The indicator will illuminate when S-FLOW mode is enabled.
Manual S-FLOW mode
When is pressed, S-FLOW mode will be manually
enabled/disabled. (P. 538)
The indicator will illuminate when S-FLOW mode is enabled.
When the power switch is turned to ON mode, the system is oper-
ated in automatic S-FLOW mode.
■Other functions
●Switching between outside air and recirculated air modes
(P. 534)
●Defogging the windshield (P. 535)
●Defogging the rear window and outside rear view mirrors
(P. 535)

5336-1. Using the air conditioning system and defogger
PRIUS PHV_OM_OM47C99E_(EE)
6
Interior features
Press .
Adjust the temperature setting. (P. 530)
To stop the operation, press .
When in automatic mode, the air outlet modes and fan speed levels
are not displayed in the air conditioning control panel display.
■Automatic mode indicator
If the fan speed setting or air flow modes are operated, the
indicator goes off. However, automatic mode for functions other
than that operated is maintained.
■Adjusting the temperature for driver and passenger seats sep-
arately (DUAL mode)
To turn on the DUAL mode, perform the following either operation:
●Press .
●Adjust the passenger’s side temperature setting.
The indicator illuminates when the DUAL mode is on.
Using automatic mode
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5346-1. Using the air conditioning system and defogger
PRIUS PHV_OM_OM47C99E_(EE)■
Switching between outside air and recirculated air modes
Press .
The mode switches between outside air mode and recirculated air mode
each time is pressed.
The indicator illuminates when the recirculated air mode is
selected.
■
Blower customization
Fan speed setting during the automatic mode operation can be cus-
tomized.
To change the fan speed setting mode, press .
Each time is pressed, the fan speed setting mode changes as
follows.
“NORMAL”  “ECO”  “FAST”  “NORMAL”
When “ECO” is displayed on the air conditioning screen, the air condi-
tioning is controlled with low fuel consumption prioritized such as reduc-
ing fan speed, etc.
When “FAST” is displayed on the screen, fan speed will be increased.
Other functions

5356-1. Using the air conditioning system and defogger
PRIUS PHV_OM_OM47C99E_(EE)
6
Interior features
■Defogging the windshield
Defoggers are used to defog the windshield and front side win-
dows.
Press .
Set to outside air mode if the recirculated air mode is used. (It
may switch automatically.)
To defog the windshield and the side windows early, turn the air flow and
temperature up.
The indicator illuminates when the defoggers are on.
To return to the previous mode, press again when the wind-
shield is defogged. Also, turning the power switch off during operation
can return to the previous mode.
■
Defogging the rear window and outside rear view mirrors
Defoggers are used to defog the rear window and to remove rain-
drops, dew and frost from the outside rear view mirrors.
Press .
Defoggers switch between on and off each time is pressed.
The indicator illuminates when defoggers are on.
The defoggers will automatically turn off after a period of time.
■
Eco score (A/C score)
P. 2 4 7

5366-1. Using the air conditioning system and defogger
PRIUS PHV_OM_OM47C99E_(EE)
■Location of air outlets
The air outlets and air volume
change according to the
selected airflow mode.
■Adjusting the air flow direction
Direct air flow to the left or right,
up or down.
■Opening and closing the air outlets
Air outlets
Left side outlet/right side outletCenter outlets
Open the vent
Close the vent
Open the vent
Close the vent
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5376-1. Using the air conditioning system and defogger
PRIUS PHV_OM_OM47C99E_(EE)
6
Interior features
■Heating
● In HV mode, the gasoline engine may operate in order to extract 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 on the outside heat exchanger, the heating perfor-
mance will decline. The frost can be removed from the outside heat
exchanger by operating the Remote Ai r Conditioning System before driv-
ing ( P. 542). When frosted over, the heating operation of the Remote
Air Conditioning System starts after defrosting.
• When is turned on, the heating is controlled optimally. Therefore,
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
extract heat from the engine coolant via the heater even in EV mode.
• The outside temperature is approx imately -10°C (14°F) or 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.
• 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.Outside heat exchanger

5386-1. Using the air conditioning system and defogger
PRIUS PHV_OM_OM47C99E_(EE)
■ Water droplets during air conditioning operation
■ Setting confirmation screen
■ S-FLOW mode operation
■ Changing from manual S-FLOW mode to automatic S-FLOW mode
Press to disable S-FLOW mode.
The indicator will go off.
Turn the power switch off.
After 60 minutes have elapsed, change the power switch to ON mode.
■ Changing settings using the multi-information display
The air conditioning system settings can be changed on the screen
of the multi-information display. ( P. 245)
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.
When changing the settings of the air
conditioning system, the setting confirma-
tion screen is shown as a pop-up on the
multi-information display.
Press of the meter control switches to
go back to the previous screen.
When is pressed, the S-FLOW
mode status is displayed on the multi-
information display.
Outside heat exchanger
Accumulator
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5396-1. Using the air conditioning system and defogger
PRIUS PHV_OM_OM47C99E_(EE)
6
Interior features
■Fogging up of the windows
●The windows will easily fog up when the humidity in the vehicle is high.
Turning on will dehumidify the air from the outlets and defog the
windshield effectively.
●If you turn off, the windows may fog up more easily.
●The windows may fog up if the recirculated air mode is used.
■Windshield fog detection function
When automatic mode is set, the humidity sensor (P. 541) detects fog on
the windshield and controls the air conditioning system to prevent fog.
■Outside/recirculated air mode
●When driving on dusty roads such as tunnels or in heavy traffic, set
to the recirculated air mode. This is effective in preventing outside air from
entering the vehicle interior. During cooling operation, setting the recircu-
lated air mode will also cool the vehicle interior effectively.
●Outside/recirculated air mode may automatically switch depending on the
temperature setting or the inside temperature.
■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 when the blower customization
is set to “ECO”
●In the “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
• Set the blower customization to “FAST” or “NORMAL” mode.
●When the driving mode is set to Eco driving mode, the fan speed setting
mode will be changed to “ECO” mode automatically. Even in this case, the
fan speed control mode can be changed by pressing . (P. 437)
■When the outside temperature falls to nearly 0C (32F)
The dehumidification function may not operate even when is pressed.

5406-1. Using the air conditioning system and defogger
PRIUS PHV_OM_OM47C99E_(EE)
■ 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 immediately after the air conditioning
system is started in automatic mode.
■ Air conditioning filter
 P. 639
■ Customization
Settings (e.g. A/C auto switching operation) can be changed.
(Customizable features: P. 738)
WARNING
■To prevent the windshield from fogging up
● Do not use during cool air operation in extremely humid weather.
The difference between the temperature of the outside air and that of the
windshield can cause the outer surface of the windshield to fog up, block-
ing your vision.
■ To prevent burns
Do not touch the rear view mirror surfaces when the outside rear view mirror
defoggers are on.
● Do not place anything on the instrument
panel which may cover the air outlets.
Otherwise, air flow may be obstructed,
preventing the windshield defoggers
from defogging.