Toyota Prius (2022 year). Manual in english - page 22

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The areas that vehicles can be detected in are outlined below.

To give the driver a more consistent time to react, the buzzer can alert
for faster vehicles from farther away.
Example:

■

The Rear Cross Traffic Alert function is operational when

●

The BSM system is set to on. (



P. 151)

●

The shift position is in R.

●

Vehicle speed is less than approximately 5 mph (8 km/h).

●

Approaching vehicle speed is between approximately 5 mph (8 km/h) and
18 mph (28 km/h).

The Rear Cross Traffic Alert function detection areas

Approaching vehicle

Speed

Approximate 
alert distance

Fast

18 mph (28 km/h)

65 ft. (20 m)

Slow

5 mph (8 km/h)

18 ft. (5.5 m)

1

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■

Conditions under which the system will not detect a vehicle

The Rear Cross Traffic Alert function is not designed to detect the following
types of vehicles and/or objects:

●

Vehicles approaching from directly behind

●

Vehicles backing up in a parking space next to your vehicle

●

Guardrails, walls, signs, parked vehicles and similar stationary objects

*

●

Small motorcycles, bicycles, pedestrians, etc.

*

●

Vehicles moving away from your vehicle

●

Vehicles approaching from the parking spaces next to your vehicle

*

●

The distance between the sensor and approaching vehicle gets too close

*

: Depending  on  the  conditions,  detection  of  a  vehicle  and/or  object  may

occur.

■

Situations in which the system may not operate properly

The Rear Cross Traffic Alert function may not detect vehicles correctly in the
following situations:

●

When the sensor is misaligned due to a strong impact to the sensor or its
surrounding area

●

When mud, snow, ice, a sticker, etc. is covering the sensor or surrounding
area on the position above the rear bumper

●

When driving on a road surface that is wet with standing water during bad
weather, such as heavy rain, snow, or fog

●

When  multiple  vehicles  are  approaching  with  only  a  small  gap  between
each vehicle

●

When a vehicle is approaching at high speed

●

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

●

Vehicles that the sensors cannot detect
due to obstructions

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●

When towing a trailer

●

When there is a significant difference in height between your vehicle and the
vehicle that enters the detection area

●

When a sensor or the area around a sensor is extremely hot or cold

●

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  backing  up  on  a  slope  with  a
sharp change in grade

●

When backing out of a sharp angle park-
ing spot

●

When turning while backing up

●

When  a  vehicle  turns  into  the  detection
area

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4-5. Using the driving support systems

■

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

Instances of the Rear Cross Traffic Alert function unnecessarily detecting a
vehicle and/or object may increase in the following situations:

●

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 there are spinning objects near your vehicle such as the fan of an air
conditioning unit

●

When water is splashed or sprayed toward the rear bumper, such as from a
sprinkler

●

Moving objects (flags, exhaust fumes, large rain droplets or snowflakes, rain
water on the road surface, etc.)

●

When  the  parking  space  faces  a  street
and  vehicles  are  being  driven  on  the
street

●

When the distance between your vehicle
and  metal  objects,  such  as  a  guardrail,
wall, sign, or parked vehicle, which may
reflect  electrical  waves  toward  the  rear
of the vehicle, is short

●

When  a  vehicle  passes  by  the  side  of
your vehicle

●

When  a  detected  vehicle  turns  while
approaching the vehicle

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4-5. Using the driving support systems

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●

When  the  distance  between  your  vehicle  and  a  guardrail,  wall,  etc.,  that
enters the detection area is short

●

Gratings and gutters

●

When a sensor or the area around a sensor is extremely hot or cold

●

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

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4-5. Using the driving support systems

Intuitive parking assist



Front corner sensors
Front center sensors
Rear corner sensors
Rear center sensors
Front side sensors
Rear side sensors

The intuitive parking assist can be

enabled/disabled  on  the 

screen  (



P.  151)  of  the  multi-

information display.

When on is selected, intuitive park-
ing assist indicator will come on.

Once off is selected, the intuitive parking assist will not return to on until it

is turned to on by the 

 screen of multi-information display again. (The

system does not automatically return to on even when the hybrid system is
restarted.)



: If equipped

The distance from your vehicle to nearby obstacles when paral-
lel  parking  or  maneuvering  into  a  garage  is  measured  by  the
sensors  and  communicated  via  the  displays  and  a  buzzer.
Always check the surrounding area when using this system.

Types of sensors

1

2

3

4

5

6

Turning the intuitive parking assist on/off

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When  the  sensors  detect  an  obstacle,  the  following  displays  inform
the driver of the position and distance to the obstacle.

■

Multi-information display

Front  center  sensor  opera-
tion
Front  corner  sensor  opera-
tion
Front side sensor operation
Rear side sensor operation
Rear corner sensor operation
Rear center sensor operation

• The operation display is gray when the sensors are operating.
• The front side sensor operation displays and rear side sensor opera-

tion  displays  are  not  shown  until  a  scan  of  the  side  areas  is  com-
pleted.

Display

1

2

3

4

5

6

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■

Distance display

Sensors that detect an obstacle will illuminate continuously or blink.

*

: The images may differ from those shown in the illustrations depending on

the detection status. (



P. 359)

Sensor detection display, obstacle distance

Display

*

Approximate distance to obstacle

Front corner, 

front center and 

front side sensors

Rear corner, 

rear center and 

rear side sensors

(continuous)

3.3 ft. (100 cm) to 
2.0 ft (60 cm)

4.9 ft. (150 cm) to 
2.0 ft. (60 cm)

(continuous)

2.0 ft. (60 cm) to 
1.5 ft (45 cm)
2.0 ft. (60 cm) to 
1.5 ft. (45 cm)
3.3 ft. (100 cm) to 
2.3 ft. (70 cm)

3.3 ft. (100 cm) to 
2.3 ft. (70 cm)
2.0 ft. (60 cm) to 
1.5 ft (45 cm)
2.0 ft. (60 cm) to 
1.5 ft. (45 cm)

(continuous)

1.5 ft. (45 cm) to 
1.2 ft. (35 cm)
1.5 ft. (45 cm) to 
1.2 ft. (35 cm)
2.3 ft. (70 cm) to 
1.0 ft. (30 cm)

2.3 ft. (70 cm) to 
1.0 ft. (30 cm)
1.5 ft. (45 cm) to 
1.2 ft. (35 cm)
1.5 ft. (45 cm) to 
1.2 ft. (35 cm)

(blinking)

Less than 
1.2 ft. (35 cm)
Less than 
1.2 ft. (35 cm)
Less than 
1.0 ft. (30 cm)

Less than 
1.0 ft. (30 cm)
Less than 
1.2 ft. (35 cm)
Less than 
1.2 ft. (35 cm)

Far

Near

1

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

Front center sensors
Front corner sensors
Front side sensors

Rear side sensors
Rear corner sensors
Rear center sensors

1

2

3

4

5

6

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When an obstacle is detected, the buzzer sounds.

●

As  the  obstacle  is  approached,  the  buzzer  sounds  more  rapidly.
When  the  obstacle  is  extremely  close,  the  buzzer  switches  from
sounding intermittently (short beeps) to continuously (a long beep).

• Distance to obstacle detected by front corner sensor is approxi-

mately 1.2 ft. (35 cm) or less

• Distance  to  obstacle  detected  by  front  side  sensor  or  rear  side

sensor is approximately 1.0 ft. (30 cm) or less

• Distance  to  obstacle  detected  by  front  sensor  is  approximately

1.2 ft. (35 cm) or less

• Distance to obstacle detected by rear corner sensor is approxi-

mately 1.2 ft. (35 cm) or less

• Distance  to  obstacle  detected  by  back  sensor  is  approximately

1.2 ft. (35 cm) or less

●

When an obstacle is detected by multiple sensors simultaneously,
the buzzer sounds according to the distance to the closest obsta-
cle.

●

When obstacles are simultaneously detected to the front and rear
of  the  vehicle,  separate  buzzers  sound  patterns  according  to  the
distance to each obstacle.

The volume and timing of the buzzer can be changed. (



P. 686)

Buzzer

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4-5. Using the driving support systems

Approximately 3.3 ft. (100 cm)
Approximately 4.9 ft. (150 cm)
Approximately 2.0 ft. (60 cm)
Approximately 3.3 ft. (100 cm)

• The detection range is shown in

the illustration to the right. How-
ever,  the  sensor  will  not  detect
the obstacle if it is too close.

• For  details  regarding  obstacle

detection in the side areas. 
(



P. 364)

• The distance at which an obsta-

cle can be detected and whether
it  can  be  detected  depends  on
the  shape  and  condition  of  the
obstacle.

The obstacle detection range can be changed. (



P. 686)

Detection range of the sensors

1

2

3

4

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■

Operation conditions

The power switch is turned on.

●

Front corner sensors:
• Shift position is not in P
• Vehicle speed is approximately 6 mph (10 km/h) or less

●

Front side sensors/rear side sensors:
• Shift position is not in P
• Vehicle speed is approximately 6 mph (10 km/h) or less
• Steering wheel is turned approximately 90



 or more

●

Front center sensors:
• Shift position is not in P or R
• Vehicle speed is approximately 6 mph (10 km/h) or less

●

Rear corner sensors/rear center sensors:
Shift position is in R

■

Intuitive parking assist pop-up display



P. 385

■

Sensor detection information

●

The sensor’s detection areas are limited to the areas around the vehicle’s
bumper.

●

Depending on the shape of the obstacle and other factors, the detection dis-
tance may shorten, or detection may be impossible.

●

Obstacles may not be detected if they are too close to the sensor.

●

There  will  be  a  short  delay  between  obstacle  detection  and  display.  Even
when traveling at a low speed, if you come too close to an obstacle before
the display and buzzer activate, the display and buzzer may not activate at
all.

●

Thin  posts  or  objects  lower  than  the  sensor  may  not  be  detected  when
approached, even if they have been detected once.

●

It might be difficult to hear beeps due to the volume of audio system or air
flow noise of the air conditioning system.

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■

Obstacle warning function

When  an  obstacle  in  the  side  areas  is  within  the  vehicle  course  while  the
vehicle is moving forward or backward, this function inform the driver by the
display and the buzzer.

■

Obstacle detection in side areas

●

Obstacles in the side areas are detected while driving by scanning the side
areas with the side sensors. Recognized obstacles are retained in memory
for up to approximately 2 minutes.

●

Obstacles may not be detected in the side areas until the scan completes.
After  the  power  switch  is  turned  on,  scanning  completes  after  driving  the
vehicle for a short period of time.

●

When an obstacle such as another vehicle, pedestrian or animal is detected
by the side sensors, the obstacle may continue to be detected even after it
has left the side sensor detection area.

■

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. 686)

Obstacle
Calculated vehicle course

1

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■

Objects which the system may not properly detect

The shape of the object may prevent the sensor from detecting it. Pay partic-
ular attention to the following objects:

●

Wires, fences, ropes, etc.

●

Cotton, snow and other materials that absorb sound waves

●

Sharply-angled objects

●

Low objects

●

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

■

Situations in which the system may not operate properly

Certain  vehicle  conditions  and  the  surrounding  environment  may  affect  the
ability of a sensor to correctly detect objects. Particular instances where this
may occur are listed below.

●

There is dirt, snow, water drops or ice on a sensor. (Cleaning the sensors
will resolve this problem.)

●

A  sensor  is  frozen.  (Thawing  the  area  will  resolve  this  problem.)  In  espe-
cially cold weather, if a sensor is frozen the sensor display may be displayed
abnormally, or objects, such as a wall, may not be detected.

●

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

●

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

●

A sensor is coated with a sheet of spray or heavy rain.

●

If objects draw too close to the sensor.

●

When a pedestrian is wearing clothing that does not reflect ultrasonic waves
(ex. skirts with gathers or frills).

●

When objects that are not perpendicular to the ground, not perpendicular to
the vehicle traveling direction, uneven, or waving are in the detection range.

●

Strong wind is blowing

●

When driving in inclement weather such as fog, snow or a sandstorm

●

When  an  object  that  cannot  be  detected  is  between  the  vehicle  and  a
detected object

●

If an object such as a vehicle, motorcycle, bicycle or pedestrian cuts in front
of the vehicle or runs out from the side of the vehicle

●

When  a  sensor  or  the  area  around  a
sensor is extremely hot or cold.

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4-5. Using the driving support systems

●

If the orientation of a sensor has been changed due to a collision or other
impact

●

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

●

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

●

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.

■

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

In  some  situations,  such  as  the  following,  the  system  may  operate  even
though there is no possibility of a collision.

●

When  driving  toward  a  banner,  flag,  low-hanging  branch  or  boom  barrier
(such as those used at railroad 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 driving on a narrow road

●

When strong winds are blowing

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●

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.

●

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

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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. 364)

●

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. 359) temporary turn

off.

■

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.