2018 TOYOTA PRIUS PLUG-IN HYBRID Owners Manual

4735-5. Using the driving support systems
PRIUS PHV_OM_OM47C99E_(EE)
5
Driving
When the Intelligent Clearance Sonar function detects an obstacle
with a probability of collision, hybrid system output is restricted to
restrain an increase in vehicle speed. (Hybrid system output restric-
tion control: A)
Furthermore, when the accelerator pedal continues to be depressed,
the brakes are applied to reduce the vehicle speed. (Brake control: B)
Operation

4745-5. Using the driving support systems
PRIUS PHV_OM_OM47C99E_(EE)
DOWN
DOWN
UP
ON
OFF
ON
OFF
ON
OFF
Accelerator pedal
Brake pedal
Hybrid system output
Braking force
Control starts
Collision is possible
Collision is likely
1
2
3
4
5
6
7

4755-5. Using the driving support systems
PRIUS PHV_OM_OM47C99E_(EE)
5
Driving
■Operation starting conditions
When the ICS OFF indicator is not illuminated or flashing (P. 480,
674) 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 15 km/h (10 mph) or less.
●There is an obstacle in the traveling direction of the vehicle (2 to
4 m [6 to 13 ft.] 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 Intelligent Clearance Sonar 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
(2 to 4 m [6 to 13 ft.] ahead).
Brake control
●The Intelligent Clearance Sonar 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
(2 to 4 m [6 to 13 ft.] ahead).
Operation conditions

4765-5. Using the driving support systems
PRIUS PHV_OM_OM47C99E_(EE)
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)
Accelera-
tion at a cer-
tain speed
or higher is
not possible.
Not
illuminated
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 nec-
essary
Not
illuminated
Brake con-
trol is oper-
atingEmergency
braking is
necessary
The vehicle
is stopped
by system
operationThe vehicle
is stopped
after brake
control oper-
ation
Illuminated

4775-5. Using the driving support systems
PRIUS PHV_OM_OM47C99E_(EE)
5
Driving
■Sensor detection range
The detection range of the Intelligent Clearance Sonar function differs from
the detection range of the Toyota parking assist-sensor (P. 464).
Therefore, even if the Toyota parking assist-sensor 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. 472), 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
■Toyota parking assist-sensor buzzer
Regardless of whether the Toyota parking assist-sensor is on or off (P. 4 5 9 ) ,
if the Intelligent Clearance Sonar function is not stopped (P. 472), when the
front or rear sensors detect an obstacle and brake control is performed, the
Toyota parking assist-sensor buzzer also sounds and a notification of the
approximate distance to the obstacle is provided.

4785-5. Using the driving support systems
PRIUS PHV_OM_OM47C99E_(EE)
■ 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-
sensor 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

4795-5. Using the driving support systems
PRIUS PHV_OM_OM47C99E_(EE)
5
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 Intelligent 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

4805-5. Using the driving support systems
PRIUS PHV_OM_OM47C99E_(EE)●Influence from other sonic waves
• An ultrasonic wave source is nearby, such as the horn or parking assist-
sensor 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 Intelligent Parking
Assist System is operating
P. 485
■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 35 km/h (22 mph) 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
any authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer.
●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 Dealer” is displayed on the multi-infor-
mation display, the ICS OFF indicator flashes and the buzzer sounds
The system may not be operating properly. Have the vehicle inspected at any
authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer.