Toyota Prius Prime (2020 year). Owner's manual — part 28

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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

●

On an extremely bumpy road, on an incline, on gravel, or on grass

●

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.

●

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 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.

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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. 438)

●

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. 434) 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.

●

Cotton, snow and other materials that absorb sound waves

●

Sharply-angled objects

●

Low obstacles

●

Tall obstacles with upper sections projecting outwards in the direction of
your vehicle

●

People may not be detected if they are wearing certain types of clothing.

●

Moving objects such as people or animals

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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.

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Parking Support 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

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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. 244) 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

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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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5-5. Using the driving support systems

Accelerator pedal
Brake pedal
Hybrid system output
Braking force

Control starts
Collision is possible
Collision is likely

1
2
3
4

5
6
7

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■

Operation starting conditions
When the PKSB OFF indicator is not illuminated or flashing
(

P. 452, 664) 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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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
limit acceleration or restrict output as much as possible.

Display and buzzer for hybrid system output restriction control
and brake control

Control

Situation

Multi-information

display

PKSB

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-
ing

Emergency
braking

is

necessary

The vehicle
is stopped by
system oper-
ation

The vehicle
is

stopped

after

brake

control oper-
ation

Illumi-

nated

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■

Sensor detection range
The detection range of the Parking Support Brake function differs from the
detection range of the intuitive parking assist. (

P. 437)

Therefore, even if the intuitive parking assist detects an obstacle and pro-
vides a warning, the Parking Support Brake function may not start 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 operation
and you would like to resume operation, either turn the Parking Support
Brake function on again (

P. 444), or turn the power switch off and then back

on. Furthermore, when the vehicle moves with an obstacle no longer in the
traveling direction of the vehicle, or when the traveling direction 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 right 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. 433), if the

Parking Support Brake function is not stopped (

P. 444), 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 approximate dis-
tance to the obstacle is provided.

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5-5. Using the driving support systems

■

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 vehicle 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 parking assist

sensors of another vehicle, a vehicle detector, a motorcycle engine 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

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●

Changes in the vehicle
• The vehicle is tilted a large amount
• The height of the vehicle has drastically changed due to the carried load

(the nose tilts up or down)

• The direction of the sensor has deviated due to a collision or other impact

■

In the unlikely event that the Parking Support Brake function mistakenly
operates at a crossing or elsewhere
Even in the unlikely event that the Parking Support Brake function mistakenly
operates at a crossing or elsewhere, brake control is canceled after approxi-
mately 2 seconds, allowing you to proceed forward and leave the area. Fur-
thermore, brake control is also canceled when the brake pedal is depressed.
Depressing the accelerator pedal again allows you to proceed forward and
leave the area.

■

Situations in which the system may not operate normally
In the following situations, the system may not operate normally.

●

Environmental influence
• There is an obstacle that cannot be detected between the vehicle and

another obstacle that can be detected

• An obstacle such as another vehicle, a motorcycle, a bicycle or a pedes-

trian cuts in front of the vehicle or jumps out from the side.

●

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

• The area around the sensor is

extremely hot or cold

• The wind is strong

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5-5. Using the driving support systems

●

Influence from other sonic waves
• An ultrasonic wave source is nearby, such as the horn or parking assist

sensors of another vehicle, a vehicle detector, a motorcycle engine 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

●

Changes in the vehicle
• When driving with the shift position in N
• The vehicle is tilted a large amount
• The height of the vehicle has drastically changed due to the carried load

(the nose tilts up or down)

• The direction of the sensor has deviated due to a collision or other impact

■

Parking Support Brake function while the Simple Advanced Parking
Guidance System is operating
P. 457

■

When removing and installing the 12-volt battery
The system needs to be initialized.
The system can be initialized by driving the vehicle straight ahead for 5 sec-
onds or more at a speed of approximately 22 mph (35 km/h) or higher.

■

When “PKSB Unavailable” is displayed on the multi-information display
and the PKSB OFF indicator flashes

●

Ice, snow, dirt, etc., may have adhered to the sensor. If this occurs, remove
the ice, snow, dirt, etc., from the sensor to return the system to normal.
Also, a warning message may be displayed at low temperatures due to ice
forming on the sensor, and the sensor may not detect obstacles. Once the
ice melts, the system will return to normal.

●

If this message is shown even after removing dirt from the sensor, or shown
when the sensor was not dirty to begin with, have the vehicle inspected at
your Toyota dealer.

●

System initialization may not have been performed after removal and instal-
lation of the 12-volt battery. Perform system initialization.

■

When “PKSB Malfunction Visit Your Dealer” is displayed on the multi-
information display, the PKSB OFF indicator flashes and the buzzer
sounds
The system may not be operating properly. Have the vehicle inspected at
your Toyota dealer.

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WARNING

■

For safe use
Do not rely solely upon the system. Relying solely upon the system may
lead to an unexpected accident.

●

Driving safely is the sole responsibility of the driver. Pay careful attention
to the surrounding conditions in order to ensure safe driving. The Parking
Support Brake function can provide support to lessen the severity of colli-
sions. However, it may not operate depending on the situation.

●

The Parking Support Brake function is not a system designed to com-
pletely stop the vehicle. Furthermore, even if the Parking Support Brake
function is able to stop the vehicle, brake control is canceled after approxi-
mately 2 seconds, so depress the brake pedal immediately.

■

In order for the system to operate properly
Make sure to observe the following precautions regarding the sensors
(

P. 444). Failure to observe these precautions may cause the sensors

not to operate properly, and may result in an unexpected accident.

●

Do not perform work such as modification, disassembly or painting

●

Only perform replacements using genuine parts

●

Do not subject the area around the sensors to any impacts

●

Do not damage the sensors, and always keep them clean

■

Handling the suspension
Do not modify the suspension, as changes to the height or incline of the
vehicle may prevent the sensors from correctly detecting obstacles, may
cause the system not operate, or may cause the system to operate unnec-
essarily.

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NOTICE

■

Preventing sensor malfunctions

●

If the area around a sensor is subjected to an impact, equipment may not
operate properly due to a sensor malfunction. Have the vehicle inspected
at your Toyota dealer.

●

When using a high-pressure washer to wash the vehicle, do not spray
water directly on the sensors. The sensors may not function properly if
subjected to an impact from strong water pressure.

●

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.

■

Preventing unnecessary operation
In the following situations, turn the Parking Support Brake function off. The
system may operate even though there is no possibility of a collision.

●

A chassis roller, chassis dynamo, free roller or similar equipment is being
used for an inspection, etc.

●

The vehicle is being loaded onto a ship, truck or other transport vessel

●

The suspension has been lowered or tires that have a different size than
the genuine tires are equipped

●

The height of the vehicle has drastically changed due to the carried load
(the nose tilts up or down).

●

A towing eyelet is installed

●

When using an automatic car wash

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S-APGS (Simple Advanced Parking Guidance

System)



■

Function summary
The Simple Advanced Parking Guidance System automatically
operates the steering wheel to provide support when backing into
an area near a target parking spot, and when departing from a par-
allel parking spot. (Changing the shift position and speed adjust-
ment when moving forward or backing up are not performed
automatically.)
● The Simple Advanced Parking Guidance System does not park

the vehicle automatically. It is a system that provides support
when pulling out of a perpendicular or parallel parking spot.

● The Simple Advanced Parking Guidance System provides steer-

ing wheel operation assistance to guide the vehicle toward the
selected intended parking spot. The selected intended parking
spot may not always be reachable, depending on road and vehi-
cle conditions at the time of parking, and the distance to the
intended parking spot.

■

Linking with the Parking Support Brake function
While the Simple Advanced Parking Guidance System is operating,
if the system detects an obstacle that could result in a collision, the
emergency brakes operate, regardless of whether the Parking Sup-
port Brake function is on or off. (

P. 457)



: If equipped

Simple Advanced Parking Guidance System

WARNING

●

When backing up or proceeding forward, be sure to directly confirm the
safety of the area to the front or rear, and the area around the vehicle, and
slowly back up or proceed forward while adjusting the vehicle speed by
depressing the brake pedal.

●

If it seems the vehicle may make contact with a pedestrian, another vehi-
cle or any other obstacles, stop the vehicle by depressing the brake pedal,
and then press the S-APGS switch (

P. 458) to turn the system off.