TOYOTA PRIUS PRIME 2021 Owners Manual (in English)

PRIUS PRIME_OM_OM47D71U_(U)
4515-5. Using the driving support systems
5
Driving
■If “Clean Parking Assist Sensor” is displayed on the multi-information
display
A sensor may be dirty or covered with snow or ice. In such cases, if it is
removed from the sensor, the system should return to normal.
Also, due to the sensor being frozen at low temperatures, a malfunction dis-
play may appear or an obstacle may not be detected. If the sensor thaws out,
the system should return to normal.
■If “Parking Assist Malfunction” is displayed on the multi-information dis-
play
Depending on the malfunction of the sensor, the device may not be working
normally. Have the vehicle inspected by your Toyota dealer.
■Certification (Canada only)
This ISM device complies with Canadian ICES-001.
■Customization
Settings (e.g. buzzer volume) can be changed.
(Customizable features: P. 753)
WARNING
■When using intuitive parking assist
Observe the following precautions to avoid an unexpected accident.
●Do not exceed the speed limit of 6 mph (10 km/h).
●The sensors’ detection areas and reaction times are limited. When moving
forward or reversing, check the areas surrounding the vehicle (especially
the sides of the vehicle) for safety, and drive slowly, using the brake to
control the vehicle’s speed.
●Do not install accessories within the sensors’ detection areas.

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PRIUS PRIME_OM_OM47D71U_(U)
5-5. Using the driving support systems
WARNING
■Sensors
Certain vehicle conditions and the surrounding environment may affect the
ability of the sensor to correctly detect obstacles. Particular instances where
this may occur are listed below.
●There is dirt, snow or ice on the sensor. (Wiping the sensors will resolve
this problem.)
●The sensor is frozen. (Thawing the area will resolve this problem.)
In especially cold weather, if a sensor is frozen, the screen may show an
abnormal display, or obstacles may not be detected.
●The sensor is covered in any way.
●In harsh sunlight or intense cold weather
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48004f000f0003005200550003005200510003004a00550044[ss
●The vicinity of the vehicle is noisy due to vehicle horns, motorcycle
engines, air brakes of large vehicles, or other loud noises producing ultra-
sonic waves.
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●The sensor is drenched with water on a flooded road.
●The vehicle is leaning considerably to one side.
●The vehicle is equipped with a fender pole or wireless antenna.
●The vehicle is approaching a tall or curved curb.
●The area directly under the bumpers is not detected.
●If obstacles draw too close to the sensor.
●The bumper or sensor receives a strong impact.
●A non-genuine Toyota suspension (lowered suspension etc.) is installed.
●There is another vehicle equipped with parking assist sensors in the vicin-
ity.
●Towing eyelets are installed.
●A backlit license plate is installed.
In addition to the examples above, depending on the shape and condition of
obstacles, detection may not be possible, or the detection range may be
shortened.

PRIUS PRIME_OM_OM47D71U_(U)
4535-5. Using the driving support systems
5
Driving
WARNING
■Side sensors
In the following situations, the intuitive parking assist may not operate nor-
mally and may result in an unexpected accident. Drive carefully.
●Obstacles may not be detected in the side areas until the vehicle is driven
for a short time and a scan of the side areas is completed. (P. 450)
●Even after the scan of the side areas is completed, obstacles such as
other vehicles, people or animals that approach from the sides cannot be
detected.
●Even after the scan of the side areas is completed, obstacles may not be
detected depending on the surrounding situation of the vehicle.
At that time, the side sensor operation displays (P. 446) temporary turn
off.
■Obstacles which may not be properly detected
The shape of the obstacle may prevent the sensor from detecting it. Pay
particular attention to the following obstacles:
●Wires, fences, ropes, etc.
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03005a0044005900480056[
●Sharply-angled objects
●Low obstacles
●Tall obstacles with upper sections projecting outwards in the direction of
your vehicle
●<0033004800520053004f0048000300500044005c00030051005200570003004500480003004700480057004800460057004800470003004c004900030057004b0048005c00030044005500480003005a004800440055004c0051004a000300460048005500
570044004c005100030057005c005300480056000300520049[ clothing.
●Moving objects such as people or animals

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PRIUS PRIME_OM_OM47D71U_(U)
5-5. Using the driving support systems
NOTICE
■When using intuitive parking assist
In the following situations, the system may not function correctly due to a
sensor malfunction etc. Have the vehicle checked by your Toyota dealer.
●Intuitive parking assist operation display flashes, and a beep sounds when
no obstacles are detected.
●If the area around a sensor collides with something, or is subjected to
strong impact.
●If the bumper collides with something.
●If the display shows up and remains on without a beep.
●If a display error occurs, first check the sensor.
If the error occurs even when there is no ice, snow or mud on the sensor, it
is likely that the sensor is malfunctioning.
■Notes when washing the vehicle
●Do not apply intensive bursts of water or steam to the sensor area.
Doing so may result in the sensor malfunctioning.
●When using steam to wash the vehicle, do not direct steam too close to
the sensors. The sensors may not function properly if subjected to steam.

455
PRIUS PRIME_OM_OM47D71U_(U)
5-5. Using the driving support systems
5
Driving
Parking Suppor t Brake function
The system operates in the following situations when an obstacle is
detected in the traveling direction of the vehicle.
◆The vehicle is driven at low speeds and the brake pedal is not
depressed, or is depressed too late
◆The accelerator pedal is depressed too far
: If equipped
When a collision may occur with an obstacle while parking or
traveling at low speeds, when the vehicle suddenly moves for-
ward due to mistaken accelerator pedal operation, or when the
vehicle moves due to the wrong shift position being selected,
the sensors detect obstacles to the front or rear in the traveling
direction of the vehicle, and the system operates to lessen
impact with obstacles such as walls, and reduce resulting dam-
age.
Examples of system operation

456
PRIUS PRIME_OM_OM47D71U_(U)
5-5. Using the driving support systems
◆The vehicle moves due to the wrong shift position being
selected
Front corner sensors
Front center sensors
Rear corner sensors
Rear center sensors
The Parking Support Brake function can be enabled/disabled on the
screen (P. 246) of the multi-information display.
When the Parking Support Brake
function is off, the PKSB OFF indi-
cator illuminates.
When the Parking Support Brake function is switched off, system operation
does not resume until the function is switched back on through the
screen on the multi-information display. (System operation does not
resume by operating the power switch.)
Types of sensors
1
2
3
4
Changing settings of the Parking Support Brake function

PRIUS PRIME_OM_OM47D71U_(U)
4575-5. Using the driving support systems
5
Driving
When the Parking Support Brake function detects an obstacle with a
probability of collision, hybrid system output is restricted to restrain an
increase in vehicle speed. (Hybrid system output restriction control: A)
Furthermore, when the accelerator pedal continues to be depressed,
the brakes are applied to reduce the vehicle speed. (Brake control: B)
Operation
DOWN
DOWN
UP
ON
OFF
ON
OFF
ON
OFF

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PRIUS PRIME_OM_OM47D71U_(U)
5-5. Using the driving support systems
Accelerator pedal
Brake pedal
Hybrid system output
Braking forceControl starts
Collision is possible
Collision is likely1
2
3
4
5
6
7

PRIUS PRIME_OM_OM47D71U_(U)
4595-5. Using the driving support systems
5
Driving
■Operation starting conditions
When the PKSB OFF indicator is not illuminated or flashing
(P. 464, 676) and all of the following conditions are met, the
system operates.
Hybrid system output restriction control
●The Parking Support Brake function is on.
●The vehicle speed is 10 mph (15 km/h) or less.
●There is an obstacle in the traveling direction of the vehicle (6 to
13 ft. [2 to 4 m ahead]).
●The system determined that a stronger-than-normal brake opera-
tion was necessary to avoid a collision.
Brake control
●Hybrid system output restriction control is being performed.
●The system determined that an emergency brake operation was
necessary to avoid a collision.
■Operation ending conditions
In any of the following situations, the system stops operating.
Hybrid system output restriction control
●The Parking Support Brake function has been turned off
(stopped).
●The collision became avoidable with normal brake operation.
●The obstacle is no longer in the traveling direction of the vehicle
(6 to 13 ft. [2 to 4 m ahead]).
Brake control
●The Parking Support Brake function has been turned off
(stopped).
●Approximately 2 seconds elapsed after the vehicle was stopped
by brake control.
●The brake pedal was depressed after the vehicle was stopped by
brake control.
●The obstacle is no longer in the traveling direction of the vehicle
(6 to 13 ft. [2 to 4 m ahead]).
Operation conditions

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PRIUS PRIME_OM_OM47D71U_(U)
5-5. Using the driving support systems
When the hybrid system output restriction control or brake control
operates, the buzzer sounds and a message is displayed on the multi-
information display to alert the driver.
Depending on the situation, output restriction control operates to either
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Display and buzzer for hybrid system output restriction control
and brake control
ControlSituationMulti-information
displayPKSB
OFF Indi-
cator
Buzzer
Hybrid sys-
tem output
restriction
control is
operating
(accelera-
tion limita-
tion control)
Acceleration
at a certain
speed or
higher is not
possible.
Not illumi-
nated
Short
beep
Hybrid sys-
tem output
restriction
control is
operating
(control to
restrict out-
put as much
as possible)
A stronger-
than-normal
brake opera-
tion is neces-
sary
Not illumi-
nated
Brake con-
trol is operat-
ingEmergency
braking is
necessary
The vehicle
is stopped by
system oper-
ationThe vehicle
is stopped
after brake
control oper-
ation
Illumi-
nated