2023 TOYOTA PRIUS PRIME engine

3675-5. Using the driving support systems
5
Driving
■Situations in which the system
may operate even if there is no
possibility of a collision
In some situations, such as the fol-
lowing, the system may operate
even though there is no possibility of
a collision.
●When driving on a narrow road.
●When driving toward a banner,
flag, low-hanging branch or boom
barrier (such as those used at rail-
road crossings, toll gates and
parking lots).
●When there is a rut or hole in the
surface of the road.
●When driving on a metal cover
(grating), such as those used for
drainage ditches.
●When driving up or down a steep
slope.
●If a sensor is hit by a large amount
of water, such as when driving on
a flooded road.
●There is dirt, snow, water drops or
ice on a sensor. (Cleaning the
sensors will resolve this problem.)
●A sensor is coated with a sheet of
spray or heavy rain.
●When driving in inclement weather
such as fog, snow or a sandstorm.
●When strong winds are blowing.
●When vehicle horns, vehicle
detectors, motorcycle engines, air
brakes of large vehicles, the clear-
ance sonar of other vehicles or
other devices which produce ultra-
sonic waves are near the vehicle.
●If the front of the vehicle is raised
or lowered due to the carried load.
●If the orientation of a sensor has
been changed due to a collision or
other impact.
●The vehicle is approaching a tall
or curved curb.
●Driving close to columns (H-
shaped steel beams, etc.) in multi-
story parking garages, construc-
tion sites, etc.
●If the vehicle cannot be driven in a
stable manner, such as when the
vehicle has been in an accident or
is malfunctioning.
●On an extremely bumpy road, on
an incline, on gravel, or on grass.
●When tire chains, a compact
spare tire or an emergency tire
puncture repair kit are used.

4265-5. Using the driving support systems
●The accelerator pedal is not
depressed
●The parking brake is not engaged
●The power switch is in ON
■Automatic system cancelation
of hill-start assist control
The hill-start assist control will turn
off in any of the following situations:
●Shift the shift position to P or N.
●The accelerator pedal is
depressed
●The brake pedal is depressed and
the parking brake is engaged
●A maximum of 2 seconds have
elapsed after the brake pedal is
released
●The power switch is turned to OFF
■Sounds and vibrations caused
by the ABS, brake assist, VSC,
TRAC and hill-start assist con-
trol systems
●A sound may be heard from the
engine compartment when the
brake pedal is depressed repeat-
edly, 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 sys-
tems 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.
●Operating sound heard from the engine compartment when one or
two minutes passed after the stop
of the hybrid system.
■Active Cornering Assist opera-
tion sounds and vibrations
When the Active Cornering Assist is
operated, operation sounds and
vibrations may be generated from
the brake system, but this is not a
malfunction.
■Automatic reactivation of TRAC
and VSC systems
After turning the TRAC and VSC
systems off, the systems will be
automatically re-enabled in the fol-
lowing situations:
●When the power switch is turned
off
●If only the TRAC system is turned
off, the TRAC will turn on when
vehicle speed increases
If both the TRAC and VSC sys-
tems are turned off, automatic re-
enabling will not occur when vehi-
cle speed increases.
■Operating conditions of Active
Cornering Assist
The system operates when the fol-
lowing occurs.
●TRAC/VSC can operate
●The driver is attempting to accel-
erate while turning
●The system detects that the vehi-
cle is drifting to the outer side
●The brake pedal is released
■Reduced effectiveness of the
EPS system
The effectivenes s of the EPS sys-
tem is reduced to prevent the sys-
tem from overheating when there is
frequent steering input over an
extended period of time. The steer-
ing 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.

4295-6. Driving tips
5
Driving
5-6.Driving tips
Use fluids that are appropriate
to the prevailing outside tem-
peratures.
• Engine oil
• Engine coolant
• Power control unit coolant
• Washer fluid
Have a service technician
inspect the condition of the
12-volt battery.
 Have the vehicle fitted with
four snow tires or purchase a
set of tire chains for the front
tires.
*
Ensure that all tires are the same
size and brand, and that chains
match the size of the tires.
*: Tire chains cannot be mounted
on vehicles with 195/50R19 tires.
Winter driving tips
Carry out the necessary
preparations and inspec-
tions before driving the
vehicle in winter. Always
drive the vehicle in a man-
ner appropriate to the pre-
vailing weather conditions.
Preparation for winter
WARNING
■Driving with snow tires
Observe the following precautions
to reduce the risk of accidents.
Failure to do so may result in a
loss of vehicle control and cause
death or serious injury.
●Use tires of the specified size.
●Maintain the recommended
level of air pressure.
●Do not drive in excess of 75
mph (120 km/h), regardless of
the type of snow tires being
used.
●Use snow tires on all, not just
some wheels.
■Driving with tire chains
(except 195/50R19 tires)
Observe the following precautions
to reduce the risk of accidents.
Failure to do so may result in the
vehicle being unable to be driven
safely, and may cause death or
serious injury.
●Do not drive in excess of the
speed limit specified for the tire
chains being used, or 30 mph
(50 km/h), whichever is lower.
●Avoid driving on bumpy road
surfaces or over potholes.
●Avoid sudden acceleration,
abrupt steering, sudden brak-
ing and shifting operations that
cause sudden engine braking.
●Slow down sufficiently before
entering a curve to ensure that
vehicle control is maintained.
●Do not use LTA (Lane Tracing
Assist) system.
●Do not use LDA (Lane Depar-
ture Alert) system.

4366-1. Using the air conditioning system and defogger
switch.
■Defogging the rear window
(if equipped)
A defogger is used to defog the
rear window.
Press the rear window defogger
switch.
When the rear window defogger
switch is on, the indicator illumi-
nates on the rear window defogger
switch.
The defogger will automatically turn
off after 15 minutes.
■Defogging the rear window
and outside rear view mir-
rors (if equipped)
Defoggers are used to defog the
rear window and to remove rain-
drops, dew and frost from the
outside rear view mirrors.
Press the rear window and out-
side rear view mirror defoggers
switch.
When the rear window and outside
rear view mirror defoggers switch is
on, the indicator illuminates on the
rear window and outside rear view
mirror defoggers switch.
The defoggers will automatically
turn off after 15 minutes.
■When the outside temperature
exceeds 75°F (24°C) and the air
conditioning system is on
●In order to reduce the air condi-
tioning power consumption, the air
conditioning system may switch to
recirculated air mode automati-
cally.
This may also reduce fuel con-
sumption.
●Recirculated air mode is selected
as a default mode when the power
switch is turned to ON.
●It is possible to switch to outside
air mode at any time by pressing
the outside air mode switch.
■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
conventional vehicles, heating
may be less effective and warm
air may not come out.
• When the outside heat exchanger
is frosted over, fan speed declines
and it may become harder to heat
the interior. 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.
• When “AUTO” switch is turned on, the heating is controlled opti-
mally. Therefore, the set heating
performance may not be achieved
even if the fan speed setting is
increased.
Outside heat exchanger
●In the following situations the gas-
oline engine may operate in order
to extract heat from the engine
coolant via the heater even in EV
mode.
• The outside temperature is approximately 75°F (24°C) or low
• Windshield defogger is operating
A

4376-1. Using the air conditioning system and defogger
6
Interior features
■Water droplets during air condi-
tioning operation
The outside heat exchanger, accu-
mulator and air conditioning piping
may incur condensation or frost may
form.
During or after the air conditioning
operation, water droplets may fall
from the vehicle. Ho wever, it is not a
malfunction.
Accumulator
Outside heat exchanger
■Fogging up of the windows
●The windows will easily fog up
when the humidity in the vehicle is
high. Turning “A/C” switch on will
dehumidify the air from the outlets
and defog the windshield effec-
tively.
●If you turn “A/C” switch off, the
windows may fog up more easily.
●The windows may fog up if the
recirculated air mode is used.
■While using “My Room Mode”
●It may not be possible to obtain
the intended defogging perfor-
mance even if the windshield
defogger switch is pressed. If the
windows need to be defogged
before driving, stop charging
power and then press the wind-
shield defogger switch.
●When the outside temperature is
low, heating may feel insufficient
due to restricted operation of the
air conditioning.
Heating cannot be performed
when it is approximately 14°F (-
10°C) or less as the gasoline engine cannot be started during
“My Room Mode”. If heating is
desired, stop charging and
remove the AC charging cable
from the vehicle.
■When driving on dusty roads
Close all windows. If dust thrown up
by the vehicle is still drawn into the
vehicle after closing the windows, it
is recommended that the air intake
mode be set to outside air mode
and the fan speed to any setting
except off.
■Outside/recirculated air mode
●Setting to the recirculated air
mode temporarily is recom-
mended in preventing dirty air
from entering the vehicle interior
and helping to cool the vehicle
when the outside air temperature
is high.
●Outside/recirculated air mode may
automatically switch depending on
the temperature setting or the
inside temperature.
■When the outside temperature
falls to nearly 32°F (0°C)
The dehumidification function may
not operate even when “A/C” switch
is pressed.
■Operation of the air condition-
ing system in the eco air condi-
tioning mode
●In the eco air conditioning mode,
the air conditioning system is con-
trolled as follows to prioritize fuel
efficiency:
• Engine speed and compressor
operation controlled to restrict
heating/cooling capacity
• Fan speed restricted when auto-
matic mode is selected
●The eco air conditioning mode can
be turned on and off using the
option screen of the air condition-
ing control screen. ( P.440)
●When the driving mode is
changed to Eco drive mode, the
eco air conditioning mode is
A
B

4686-4. Using the other interior features
■Power outlets
●With these power outlets, use
devices which operate on 120
VAC and have a combined maxi-
mum power consumption of 1500
W or less. If a device is connected
and the power consumption is
exceeded, a protection circuit may
be activated and the power supply
function may be stopped.
●Some of the devices that con-
sume a large amount of power,
such as an electric grille, may
require the exclusive use of the
power outlets. When such a
device is connected, do not con-nect other device(s) to the power
outlets.
●When multiple devices are con-
nected, depending on the device,
a connected device may not oper-
ate properly. For such a device,
use exclusively the power outlets.
●When a power outlet is being
used, depending on the device to
be used, the current flow may be
high and the initial peak wattage
may exceed 1500 W.
●When a power outlet is being
used, depending on the device to
be used, it may cause interference
with TV and radio broadcasts.
●While a power outlet is being
used, a cooling fan sound may be
heard from near a luggage com-
partment. This does not indicate a
malfunction.
■Devices which may not operate
properly
The following devices may not oper-
ate properly even if the combined
power consumption is 1500 W or
less:
●Devices with high initial peak watt-
age
●Devices requiring larger amount of
power supply than the power con-
sumption specified in its instruc-
tion manual
●Measuring devices that process
precise data
●Devices that require an extremely
stable power supply
●Devices that require a constant
power supply from the power out-
let, such as a device with a timer.
■Idling stop regulations
The engine starts automatically and
charging is performed when the
remaining charge of the hybrid bat-
tery (traction battery) decreases,
etc. Some local governments have
regulations against starting the
engine while parked or stopped.
Use the power outlets appropriately
Power outlet (1500 W)
The system allows the on-
board use of electric
devices which operate on
120 VAC and have a com-
bined power consumption
of 1500 W or less.
Depending on the country
or region where used, it is
not recommended to supply
power to electrical devices
outside of the vehicle as
this may be in conflict with
applicable regulations.
When supplying power to
electrical devices outside of
the vehicle, confirm with the
related local governments
regarding the applicable
regulations in each country
and region in advance. In
addition, be careful not to
drag electrical appliances or
cords when moving the
vehicle.

4716-4. Using the other interior features
6
Interior features
WARNING
• Take due care for not allowing rain to enter. If the power outlet
is wet with raindrops, dry it
before use.
• Prevent the cord from being caught in the window or door
• Allow slack in a connected cord. Do not cause it to be extraordi-
nary tense.
• Do not start off the vehicle by mistake.
●Do not refuel or wash the vehi-
cle when using a power outlet.
●Make sure that the hood is
closed.
As the engine will start automati-
cally depending on the condition
of the vehicle, make sure that
nothing is left near or contacting
the exhaust pipes.
Also, do not put your head or
hands anywhere inside the
engine compartment, as the cool-
ing fan may operate suddenly.
Keep hands and clothing (espe-
cially a tie, scarf, etc.) away from
the fan as they may get caught in
a fan.
●Do not stop the vehicle near
objects which burn easily.
If the exhaust system is extremely
hot, it may cause a fire.
●Do not use in places where cor-
rosive gases or fluids are gener-
ated.
●The gasoline engine starts auto-
matically when the remaining
charge of the hybrid battery
(traction battery) decreases.
When using a power outlet in an
area with poor ventilation or an
enclosed area, such as a
garage or a place where snow
has piled up, properly use an air
intake and exhaust device to
prevent lack of oxygen and full-
ness of exhaust gas. If such
device cannot be used, do not
use the power outlet.
■Use of a power outlet while
driving
●In situations such as the follow-
ing, do not use an electric
device while driving. Also, do
not use a device if it cannot be
secured within the vehicle.
• When a device is likely to dis- tract the driver and be a hin-
drance to safe driving, such as
a TV, video/DVD player, etc.
• When an inadequately secured device is likely to fall over in
case of sudden braking or an
accident
• When a device is likely to cause fire if it falls or generates heat
• When a device is likely to cause burns, such as a toaster, micro-
wave, electric heater, electric
kettle, coffee maker, etc.

4726-4. Using the other interior features
Observe the following precau-
tions before starting the power
supply:
Park the vehicle in a well-ven-
tilated area, avoiding loca-
tions with poor ventilation
such as garages, as the
engine may start while the
system is operating.
 Park the vehicle on a solid
and level place.
Block the wheels as needed.
Check that the hood is closed.
 Check that the parking brake
is engaged.
 Check that the shift position is
in P.
 Check that the power switch
is off.
 Note that the alarm system
WARNING
• When a device is likely to fall
under the pedals and prevent
the brake pedal from being
depressed, such as a hair dryer,
AC adapter, mouse, etc.
●Do not use devices which pro-
duce steam while the windows
are closed. Doing so may cause
the windows to fog up, reducing
visibility and making it difficult to
drive safely. Also, the steam
may damage or negatively
affect other devices. If the
device must be used, stop the
vehicle and open the windows
before use.
NOTICE
■To avoid short circuit or mal-
function
Observe the following precau-
tions. Failure to do so may lead to
the power outlets not operating
correctly or damage to the vehicle
or a connected device.
●Do not set a toaster or other
device which generates heat
near the interior components or
on a seat. Heat may cause
these parts to melt or burn.
●Do not use devices which are
sensitive to vibration or heat in
the vehicle. These devices may
malfunction due to vibration
while driving or heat while the
vehicle is parked in the sun.
●When not using a power outlet,
make sure to close the lid. If for-
eign matter or a liquid enters the
power outlet, it may cause a
malfunction or short circuit.
■Using the power outlet while
parked or stopped
●Water may leak from the
exhaust pipe while the engine
running if the power outlet is
used for a long time. However,
this is not a malfunction.
●At extremely low temperatures,
water may freeze in the exhaust
pipe and make it difficult to start
the engine, or an odor may
come from the exhaust pipe. In
this case, stop using the power
outlet, and then drive the vehi-
cle for 15 to 30 minutes.
Precautions for using the
power outlets while
parked