2021 TOYOTA PRIUS parking brake

PRIUS_OM_OM47E09U_(U)
3694-5. Using the driving support systems
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Driving
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 t he brake to
control the vehicle’s speed.
● Do not install accessories within the sensors’ detection areas.

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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 w ill resolve
this problem.)
● The sensor is frozen. (Thawing the area will resolve this probl em.)
In especially cold weather, if a sensor is frozen, the screen m ay show an
abnormal display, or obstacles may not be detected.
● The sensor is covered in any way.
● In harsh sunlight or intense cold weather
● On an extremely bumpy road, on an incline, on gravel, or on grass
● The vicinity of the vehicle is noisy due to vehicle horns, moto rcycle
engines, air brakes of large vehicles, or other loud noises pro ducing ultra-
sonic waves.
● The sensor is splashed with water or drenched with heavy rain.
● 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 in stalled.
● There is another vehicle equipped with parking assist sensors i n the vicin-
ity.
● Towing eyelets are installed.
● A backlit license plate is installed.
In addition to the examples above, depending on the shape and c ondition of
obstacles, detection may not be possible, or the detection rang e may be
shortened.

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Driving
Parking Suppor t Brake function
The system operates in the follo wing situations when an obstacle is
detected in the traveling d irection 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 travel ing
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

PRIUS_OM_OM47E09U_(U)
3754-5. Using the driving support systems
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Driving
Front corner sensors
Front center sensors
Rear corner sensors
Rear center sensors
The Parking Support Brake funct ion can be enabled/disabled on the
screen ( P. 151) 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 Park ing Support Brake function

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When the Parking Support Brake f unction detects an obstacle with a
probability of collision, hybrid system output is restricted to restrain an
increase in vehicle speed. (Hybri d system output restriction control: A)
Furthermore, when the accelerator pedal continues to be depress ed,
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_OM_OM47E09U_(U)
4-5. Using the driving support systems
■Operation starting conditions
When the PKSB OFF indicator is not illuminated or flashing ( P. 3 8 3 ,
603) and all of the following conditions are met, the system op erates.
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 restricti on control is being performed.
● The system determined that a n emergency brake operation was
necessary to av oid a collision.
■Operation ending conditions
In any of the following situatio ns, the system stops operating.
Hybrid system output restriction control
● The Parking Support Brake function has been turned off
(stopped).
● The collision became a voidable with normal brake operation.
● The obstacle is no longer in the traveling direction of the veh icle
(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 veh icle
(6 to 13 ft. [2 to 4 m ahead]).
Operation conditions

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■Sensor detection range
The detection range of the Parking Support Brake function diffe rs from the
detection range of the intuitive parking assist. ( P. 366)
Therefore, even if the intuitive parking assist detects an obst acle and pro-
vides a warning, the Parking Support Brake function may not sta rt operating.
■ System operation
When the vehicle is stopped by system operation, the Parking Support Brake
function stops and the PKSB OFF indicator illuminates.
■ System recovery
When the Parking Support Brake function is stopped by system op eration
and you would like to resume operation, either turn the Parking Support
Brake function on again ( P. 375), or turn the power switch off and then back
on. Furthermore, when the vehicle moves with an obstacle no lon ger in the
traveling direction of the vehicle, or when the traveling direc tion of the vehicle
changes (such as when switching from moving forward to backing up, and
vice versa), system operation automatically resumes.
■ Obstacles not detected by the sensors
The following obstacles may not be detected by the sensors.
●Objects such as people, cloth and snow, that are difficult for sonic waves to
reflect off of. (In particular, people may also not be detected depending on
the type of clothing they are wearing.)
● Objects not perpendicular with the ground, objects not at a rig ht angle to the
traveling direction of the vehicle, uneven objects or waving objects
● Low objects
● Thin objects such as wires, fences, ropes and signposts
● Objects that are extremely close to the bumper
■ Intuitive parking assist buzzer
Regardless of whether the intuitive parking assist is on or off ( P. 362), if the
Parking Support Brake function is not stopped ( P. 375), when the front or
rear sensors detect an obstacle and brake control is performed, the intuitive
parking assist buzzer also sounds and a notification of the app roximate dis-
tance to the obstacle is provided.

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Driving
■Situations when the system may operate even though there is no possi-
bility of a collision
In the following situations, the system may operate even though there is no
possibility of a collision.
● Environmental influence
• The vehicle is driven toward a banner or flag, a low-hanging branch or a
boom barrier (such as those used at railroad crossings, toll gates and
parking lots).
• There is an obstacle on the shoulder of the road (when the veh icle is
driven in a narrow tunnel, on a narrow bridge or on a narrow road)
• The vehicle is being parallel parked
• There is a rut or hole in the surface of the road
• When the vehicle is driven on a metal cover (grating), such as those used
for drainage ditches
• The vehicle is driven on a steep slope
• The sensor is covered by water on a flooded road
● Influence from the weather
• Ice, snow, dirt, etc., has adhered to the sensor (if removed, the system
returns to normal)
• Heavy rain or water strikes the vehicle
• In severe weather such as fog, snow or a sand storm
● Influence from other sonic waves
• An ultrasonic wave source is nearby, such as the horn or parki ng assist
sensors of another vehicle, a vehicle detector, a motorcycle en gine or the
air brake of a large vehicle
• Electronic components (such as a backlit license plate (especially fluo-
rescent types), fog lights, a fender pole or a wireless antenna ) are
installed near the sensors
• The vehicle is driven on a narrow
road
• The vehicle is driven on a gravel road or in an area with tall grass