2018 TOYOTA PRIUS Owners Manual (in English)

PRIUS_OM_OM47B89U_(U)
3534-5. Using the driving support systems
4
Driving
When the Intelligent Clearance So nar function detects an obstacle
with a probability of collision, hybr id system output is restricted to
restrain an increase in vehicle spe ed. (Hybrid system output restric-
tion control: A)
Furthermore, when the accelerato r pedal continues to be depressed,
the brakes are applied to reduce t he vehicle speed. (Brake control: B)
Operation
DOWN
DOWN
UP
ON
OFF
ON
OFF
ON
OFF

354
PRIUS_OM_OM47B89U_(U)
4-5. Using the driving support systems
Accelerator pedal
Brake pedal
Hybrid system output
Braking force Control starts
Collision is possible
Collision is likely1
2
3
4
5
6
7

PRIUS_OM_OM47B89U_(U)
3554-5. Using the driving support systems
4
Driving
■Operation starting conditions
When the ICS OFF indi cator is not illuminated or flashing ( →P. 360,
684) and all of the following conditions are met, the system operates.
Hybrid system output restriction control
● The Intelligent Clearance Sonar is on.
● The vehicle speed is 10 mph (15 km/h) or less.
● There is an obstacle in the trav eling direction of the vehicle (6
to 13 ft. [2 to 4 m ahead]).
● The system determined that a stronger-than-normal brake
operation was necessar y to avoid a collision.
Brake control
●Hybrid system output restrict ion 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 Intelligent Clearance Sonar function has been turned off
(stopped).
● The collision became avoidable with normal brake operation.
● The obstacle is no longer in th e traveling direction of the vehi-
cle (6 to 13 ft. [2 to 4 m ahead]).
Brake control
● The Intelligent Clearance Sonar function has been turned off
(stopped).
● Approximately 2 seconds elap sed 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 th e traveling direction of the vehi-
cle (6 to 13 ft. [2 to 4 m ahead]).
Operation conditions

356
PRIUS_OM_OM47B89U_(U)
4-5. 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
ControlSituationMulti-information displayICS OFF IndicatorBuzzer
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-
ingEmergency
braking is
necessary
The vehicle
is stopped by
system oper-
ationThe vehicle
is stopped
after brake
control oper-
ation
Illumi-
nated

PRIUS_OM_OM47B89U_(U)
3574-5. Using the driving support systems
4
Driving
■Sensor detection range
The detection range of the Intelligent Clearance Sonar function differs from
the detection range of the clearance sonar ( →P. 343).
Therefore, even if the clearance sonar detects an obstacle and provides a
warning, the Intelligent Clearance Sonar may not start operating.
■ System operation
When the vehicle is stopped by system operation, the Intelligent Clearance
Sonar function stops and the ICS OFF indicator illuminates.
■ System recovery
When the Intelligent Clearance Sonar function is stopped by system opera-
tion and you would like to resume operation, either turn the Intelligent Clear-
ance Sonar ON again ( →P. 339), 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
■ Clearance sonar buzzer
Regardless of whether the clearance sonar is on or off ( →P. 339), if the Intel-
ligent Clearance Sonar function is not stopped ( →P. 352), when the front or
rear sensors detect an obstacle and brake control is performed, the clearance
sonar buzzer also sounds and a notification of the approximate distance to
the obstacle is provided.

358
PRIUS_OM_OM47B89U_(U)
4-5. Using the driving support systems
■Situations when the system may opera te 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 clearance sonar
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

PRIUS_OM_OM47B89U_(U)
3594-5. Using the driving support systems
4
Driving
●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 Intellig ent Clearance Sonar function mistak-
enly operates at a crossing or elsewhere
Even in the unlikely event that the Intelligent Clearance Sonar function mis-
takenly operates at a crossing or elsewhere, brake control is canceled after
approximately 2 seconds, allowing you to proceed forward and leave the
area. Furthermore, 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

360
PRIUS_OM_OM47B89U_(U)
4-5. Using the driving support systems
●Influence from other sonic waves
• An ultrasonic wave source is nearby, such as the horn or clearance sonar
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
• 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
■ Intelligent Clearance Sonar function while the Simple Advanced Parking
Guidance System is operating
→P. 365
■ When removing and installi ng 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 “ICS Unavailable” is displayed on the multi-information display
and the ICS 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 “ICS Malfunction Visit Your Deal er” is displayed on the multi-infor-
mation display, the ICS OFF indi cator flashes and the buzzer sounds
The system may not be operating properly. Have the vehicle inspected at
your Toyota dealer.