Toyota Prius Prime (2022 year). Manual in english - page 28

449

5-5. Using the driving support systems

5

Drivin

g

●

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  vehicle  horns,  vehicle  detectors,  motorcycle  engines,  air  brakes  of
large vehicles, the clearance sonar of other vehicles or other devices which
produce ultrasonic 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

●

Driving close to columns (H-shaped steel beams, etc.) in multi-story parking
garages, construction 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

●

When tire chains, a compact spare tire or an emergency tire puncture repair
kit are used.

●

When strong winds are blowing

●

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

450

5-5. Using the driving support systems

WARNING

■

Cautions regarding the use of the system

There  is  a  limit  to  the  degree  of  recognition  accuracy  and  control  perfor-
mance that this system can provide, do not overly rely on this system. The
driver is always responsible for paying attention to the vehicle’s surround-
ings and driving safely.

■

To ensure the system can operate properly

Observe the following precautions to avoid an unexpected accident.

●

Do not damage the sensors, and always keep them clean.

●

Do not attach a sticker or install an electronic component, such as a backlit
license plate (especially fluorescent type), fog lights, fender pole or wire-
less antenna near a radar sensor.

●

Do  not subject  the surrounding  area  of the  sensor  to a strong  impact.  If
subjected to an impact, have the vehicle inspected by your Toyota dealer.
If the front or rear bumper needs to be removed/installed or replaced, con-
tact your Toyota dealer.

●

Do not modify, disassemble or paint the sensors.

●

Do not attach a license plate cover.

●

Keep your tires properly inflated.

■

When to disable the function

In  the  following  situations,  disable  the  function  as  it  may  operate  even
though there is no possibility of a collision.

●

Failing to observe the warnings above.

●

A non-genuine Toyota suspension (lowered suspension, etc.) is installed.

■

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. 446)

●

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. 442) temporary turn

off.

451

5-5. Using the driving support systems

5

D

riv

in

g

WARNING

■

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.

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.

452

5-5. Using the driving support systems

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

453

5-5. Using the driving support systems

5

Drivin

g

◆

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

454

5-5. Using the driving support systems

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

455

5-5. Using the driving support systems

5

Drivin

g

Accelerator pedal
Brake pedal
Hybrid system output
Braking force

Control starts
Collision is possible
Collision is likely

1
2
3
4

5
6
7

456

5-5. Using the driving support systems

■

Operation starting conditions

When  the  PKSB  OFF  indicator  is  not  illuminated  or  flashing
(



P. 459, 673) 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 approximately 10 mph (15 km/h) or less.

●

There  is  an  obstacle  in  the  traveling  direction  of  the  vehicle
(approximately 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
(approximately 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
(approximately 6 to 13 ft. [2 to 4 m] ahead).

Operation conditions

457

5-5. Using the driving support systems

5

Drivin

g

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

458

5-5. Using the driving support systems

■

Sensor detection range

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



P. 445)

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. 453), 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

■

Situations in which the system may not operate properly



P. 447

■

Situations in which the system may operate even if there is no possibil-
ity of a collision



P. 448

■

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.

■

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.

459

5-5. Using the driving support systems

5

D

riv

in

g

■

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.

■

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.

WARNING

■

Cautions regarding the use of the system

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.

●

It is extremely dangerous to check the system operations by intentionally
driving  the  vehicle  into  the  direction  of  a  wall,  etc.  Never  attempt  such
actions.

460

5-5. Using the driving support systems

WARNING

■

When to disable the Parking Support Brake

In the following situations, disable the Parking Support Brake as the system
may operate even though there is no possibility of a collision.

●

When inspecting the vehicle using a chassis roller, chassis dynamo or free
roller

●

When loading the vehicle onto a boat, truck or other transport vessel

●

If the suspension has been modified or tires of a size other than specified
are installed

●

If the front of the vehicle is raised or lowered due to the carried load

●

When equipment that may obstruct a sensor is installed, such as a towing
eyelet, bumper protector (an additional trim strip, etc.), bicycle carrier, or
snow plow

●

When using automatic car washing devices

●

If the vehicle cannot be driven in a stable manner, such as when the vehi-
cle has been in an accident or is malfunctioning

●

When the vehicle is driven in a sporty manner or off-road

●

When the tires are not properly inflated

●

When the tires are very worn

●

When tire chains, compact spare tire or an emergency tire puncture repair
kit are used

■

To ensure the system can operate properly



P. 450

■

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.

■

If the Parking Support Brake function (static objects) operates unnec-
essarily, such as at a railroad crossing



P. 458

■

Notes when washing the vehicle



P. 451

461

5-5. Using the driving support systems

5

D

riv

in

g

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.

462

5-5. Using the driving support systems

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. 464)



: 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. 465) to turn the system off.

463

5-5. Using the driving support systems

5

Drivin

g

Chart  of  Simple  Advanced  Parking  Guidance  System  assist
modes and functions

Assist mode

Type of 
parking

Function summary

See page

Parallel parking 

assist mode

Parallel park-

ing

Guidance  is  provided  to
detect 

the 

intended

parking spot and reach a
position  to  begin  back-
ing  up  from. Assistance
is  provided  from  when
the vehicle begins back-
ing  up  until  it  reaches
the  intended  parking
spot.

P. 468

Exit parallel parking 

assist mode

Exit parallel 

parking

Assistance  starts  after
the  vehicle  has  been
parallel  parked.  Assis-
tance  is  provided  to
guide  the  vehicle  from
the  parking  space  to  a
position  from  which  it
can take off.

P. 475

Back-in parking 

assist mode

(with forward guid-

ance function)

Back-in park-

ing

Assistance  starts  after
stopping  the  vehicle  in
front  of  the  intended
parking spot, and is pro-
vided  for  backing  into  a
parking space, including
guidance  to  reach  a
position  to  begin  back-
ing up from.

P. 480

464

5-5. Using the driving support systems

■

Parking  Support  Brake  function  while  the  Simple  Advanced  Parking
Guidance System is operating

While the Simple Advanced Parking Guidance System is operating, if the sys-
tem detects an obstacle that could result in a collision, hybrid system output
restriction control and brake control of the Parking Support Brake function are
operated, regardless of whether the Parking Support Brake function is on or
off. (



P. 453)

●

After the Parking Support Brake function operates, operation of the Simple
Advanced Parking Guidance System is temporarily stopped, and operation
of the Parking Support Brake function is indicated on the multi-information
display. (



P. 457)

●

When  operation  of  the  Simple  Advanced  Parking  Guidance  System  is
stopped  3  times  by  operation  of  the  Parking  Support  Brake  function,  the
Simple Advanced Parking Guidance System is canceled.

●

Once  the  Simple Advanced  Parking  Guidance  System  becomes  available
after the Parking Support Brake function is operated, a message prompting
you  to  shift  is  displayed  on  the  multi-information  display.  Operation  of  the
Simple Advanced  Parking  Guidance  System  can  be  resumed  by  shifting
according  to  the  prompt  on  the  multi-information  display  and  pressing  the
S-APGS switch (



P. 465) again.

■

Shifting while the Simple Advanced Parking Guidance System is operat-
ing

If the system determines that the driver intends to move forward or in reverse,
assistance continues even if the driver shifted before being prompted to do so
by the system. However, because driver operation differs from the guidance
provided by the system, the number of turning maneuvers may increase.

■

Customization

Settings (e.g. obstacle detection range) can be changed. (Customizable fea-
tures: 



P. 749)