Toyota Prius Prime (2020 year). Owner's manual — part 27

424

5-5. Using the driving support systems

WARNING

■

Handling the radar sensor

●

Keep the sensor and its surrounding area on the bumper clean at all times.

●

Do not subject a sensor or its surrounding area on the rear bumper to a
strong impact.
If a sensor is moved even slightly off position, the system may malfunction
and vehicles may not be detected correctly.
In the following situations, have your vehicle inspected by your Toyota
dealer.
• A sensor or its surrounding area is subject to a strong impact.
• If the surrounding area of a sensor is scratched or dented, or part of

them has become disconnected.

●

Do not disassemble the sensor.

●

Do not attach accessories or stickers to the sensor or surrounding area on
the bumper.

●

Do not modify the sensor or surrounding area on the bumper.

●

Do not paint the rear bumper any color other than an official Toyota color.

One Blind Spot Monitor sensor is
installed inside the left and right side of
the vehicle rear bumper respectively.
Observe the following to ensure the Blind
Spot Monitor can function correctly.

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The Blind Spot Monitor function uses radar sensors to detect vehicles
that are traveling in an adjacent lane in the area that is not reflected in
the outside rear view mirror (the blind spot), and advises the driver of
the vehicle’s existence via the outside rear view mirror indicator.

The areas that vehicles can be detected in are outlined below.
The range of the detection area extends to:

Approximately 11.5 ft. (3.5 m)
from the side of the vehicle

The first 1.6 ft. (0.5 m) from the
side of the vehicle is not in the
detection area

Approximately 9.8 ft. (3 m) from
the rear bumper
Approximately 3.3 ft. (1 m) for-
ward of the rear bumper

The Blind Spot Monitor function

The Blind Spot Monitor function detection areas

IO55PH029

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2

3

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■

The Blind Spot Monitor function is operational when

●

The BSM system is set to on (

P. 244)

●

Vehicle speed is greater than approximately 10 mph (16 km/h)

■

The Blind Spot Monitor function will detect a vehicle when

●

A vehicle in an adjacent lane overtakes your vehicle.

●

You overtake a vehicle in adjacent lane slowly.

●

Another vehicle enters the detection area when it changes lanes.

■

Conditions under which the Blind Spot Monitor function will not detect a
vehicle
The Blind Spot Monitor function is not designed to detect the following types
of vehicles and/or objects:

●

Small motorcycles, bicycles, pedestrians etc.

*

●

Vehicles traveling in the opposite direction

●

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

*

●

Following vehicles that are in the same lane

*

●

Vehicles driving 2 lanes across from your vehicle

*

●

Vehicles which are being overtaken rapidly by your vehicle

*

*

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

WARNING

■

Cautions regarding the use of the system
The driver is solely responsible for safe driving. Always drive safely, taking
care to observe your surroundings.
The Blind Spot Monitor function is a supplementary function which alerts the
driver that a vehicle is present in the blind spot. Do not overly rely on the
Blind Spot Monitor function. The function cannot judge if it is safe to change
lanes, therefore over reliance could cause an accident resulting in death or
serious injury.
According to conditions, the system may not function correctly. Therefore
the driver’s own visual confirmation of safety is necessary.

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■

Conditions under which the Blind Spot Monitor function may not func-
tion correctly

●

The Blind Spot Monitor function may not detect vehicles correctly in the fol-
lowing 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 surround-

ing area on 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 the distance between your vehicle and a following vehicle is short
• When there is a significant difference in speed between your vehicle and

the vehicle that enters the detection area

• When the difference in speed between your vehicle and another vehicle

is changing

• When a vehicle enters a detection area traveling at about the same

speed as your vehicle

• As your vehicle starts from a stop, a vehicle remains in the detection area
• When driving up and down consecutive steep inclines, such as hills, dips

in the road, etc.

• When driving on roads with sharp bends, consecutive curves, or uneven

surfaces

• When vehicle lanes are wide, or when driving on the edge of a lane, and

the vehicle in an adjacent lane is far away from your vehicle

• When a bicycle carrier or other accessory is installed to the rear of the

vehicle

• When there is a significant difference in height between your vehicle and

the vehicle that enters the detection area

• Immediately after the Blind Spot Monitor function is turned on

●

Instances of the Blind Spot Monitor function unnecessarily detecting a vehi-
cle and/or object may increase in the following situations:
• When the sensor is misaligned due to a strong impact to the sensor or its

surrounding area

• When the distance between your vehicle and a guardrail, wall, etc. that

enters the detection area is short

• When driving up and down consecutive steep inclines, such as hills, dips

in the road, etc.

• When vehicle lanes are narrow, or when driving on the edge of a lane,

and a vehicle traveling in a lane other than the adjacent lanes enters the
detection area

• When driving on roads with sharp bends, consecutive curves, or uneven

surfaces

• When the tires are slipping or spinning
• When the distance between your vehicle and a following vehicle is short
• When a bicycle carrier or other accessory is installed to the rear of the

vehicle

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5-5. Using the driving support systems

The Rear Cross Traffic Alert functions when your vehicle is in reverse.
It can detect other vehicles approaching from the right or left rear of
the vehicle. It uses radar sensors to alert the driver of the other vehi-
cle’s existence through flashing the outside rear view mirror indicators
and sounding a buzzer.

The Rear Cross Traffic Alert function

IO55PH087

Approaching vehicles

Detection areas

WARNING

■

Cautions regarding the use of the system
The driver is solely responsible for safe driving. Always drive safely, taking
care to observe your surroundings.
The Rear Cross Traffic Alert function is only an assist and is not a replace-
ment for careful driving. The driver must be careful when backing up, even
when using the Rear Cross Traffic Alert function. The driver’s own visual
confirmation of behind you and your vehicle is necessary and be sure there
are no pedestrians, other vehicles etc. before backing up. Failure to do so
could cause death or serious injury.
According to conditions, the system may not function correctly. Therefore
the driver’s own visual confirmation of safety is necessary.

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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. 244)

●

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

IO55PH088

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)

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5-5. Using the driving support systems

■

Conditions under which the Rear Cross Traffic Alert function 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

*

*

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

occur.

■

Conditions under which the Rear Cross Traffic Alert function may not
function correctly

●

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 surround-

ing area on 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

●

Vehicles that the sensors cannot detect
due to obstructions

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• Immediately after the Blind Spot Monitor function is turned on
• Immediately after the hybrid system is started with the Blind Spot Monitor

function on

• When backing up on a slope with a

sharp change in grade

• When backing out of a shallow angle

parking spot

• When the sensors cannot detect a

vehicle due to obstructions

IO55PH089

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5-5. Using the driving support systems

●

Instances of the Rear Cross Traffic Alert function unnecessarily detecting a
vehicle and/or object may increase in the following situations:
• When a vehicle passes by the side of your vehicle

• 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 the parking space faces a

street and vehicles are being driven
on the street

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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. 244) 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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5-5. Using the driving support systems

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

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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. 434)

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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5-5. Using the driving support systems

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. 741)

Buzzer

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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. 438)

• 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. 741)

■

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. 459

Detection range of the sensors

1
2
3
4

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■

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.

■

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. (

P. 435, 436)

■

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.

Obstacle
Calculated vehicle course

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■

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. 741)

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.