2021 TOYOTA PRIUS wheel

PRIUS_OM_OM47E09U_(U)
3194-5. Using the driving support systems
4
Driving
■Temporary cancelation of functions
●When operation conditions are no longer met, a function may be temporarily
canceled. However, when the operation conditions are met again, operation
of the function is automatically restored. ( P. 317)
● If the operation conditions ( P. 318) are no longer met while the lane cen-
tering function is operating, the buzzer may sound to indicate that the func-
tion has been temporarily canceled.
■ Steering assist function/lane centering function
●Depending on the vehicle speed, lane departure situation, road conditions,
etc., the driver may not feel the function is operating or the function may not
operate at all.
● The steering control of the function is overridden by the drive r’s steering
wheel operation.
● Do not attempt to test the operation of the steering assist fun ction.
■ Lane departure alert function
●The warning buzzer may be difficult to hear due to external noi se, audio
playback, etc.
● If the edge of the course
* is not clear or straight, the lane departure alert
function may not operate.
● Do not attempt to test the operation of the lane departure aler t function.
*: Boundary between asphalt and the side of the road, such as gra ss, soil, or
a curb

320
PRIUS_OM_OM47E09U_(U)
4-5. Using the driving support systems
■Hands off steering wheel warning
●When the system determines that t he driver is driving without holding the
steering wheel while the system is operating
If the driver continues to keep their hands off of the steering wheel, the
buzzer sounds, the driver is warned and the function is temporarily can-
celed. This warning also operates in the same way when the driv er continu-
ously operates the steering wheel only a small amount.
● When the system determines that the vehicle may deviate from th e lane
while driving around a curve while the lane centering function is operating
Depending on the vehicle condition and road conditions, the war ning may
not operate. Also, if the system determines that the vehicle is driving
around a curve, warnings will occur earlier than during straight-lane driving.
● When the system determines that t he driver is driving without holding the
steering wheel while the steering wheel assist of the steering assist function
is operating.
If the driver continues to keep their hands off of the steering wheel and the
steering wheel assist is operating, the buzzer sounds and the d river is
warned. Each time the buzzer sounds, the continuing time of the buzzer
becomes longer.
■ Vehicle sway warning function In the following situations, a warning mes-
sage urging the driver to hold the steering
wheel and the symbol shown in the illus-
tration are displayed on the multi-informa-
tion display to warn the driver. The
warning stops when the system deter-
mines that the driver holds the steering
wheel. Always keep your hands on the
steering wheel when using this system,
regardless of warnings.
When the system determines that the
vehicle is swaying while the vehicle sway
warning function is operating, a buzzer
sounds and a warning message urging
the driver to rest and the symbol shown in
the illustration are simultaneously dis-
played on the multi-information display.
Depending on the vehicle and road condi-
tions, the warning may not operate.

PRIUS_OM_OM47E09U_(U)
3314-5. Using the driving support systems
4
Driving
Example of constant speed cruising
When there are no vehicles ahead
The vehicle travels at the speed set by the driver.
Example of deceleration crui sing and follow-up cruising
When a preceding vehicle driving slower than the set speed
appears
When a vehicle is detected running ahead of you, the system automatically
decelerates your vehicle. When a greater reduction in vehicle s peed is
necessary, the system applies the brakes (the stop lights will come on at
this time). The system will respond to changes in the speed of the vehicle
ahead in order to maintain the vehicle-to-vehicle distance set by the driver.
Approach warning warns you when the system cannot decelerate su ffi-
ciently to prevent your vehicle fr om closing in on the vehicle ahead.
When the vehicle ahead of you stops, your vehicle will also stop (vehicle is
stopped by system control). After the vehicle ahead starts off, pushing the
cruise control lever up or depressing the accelerator pedal (st art-off opera-
tion) will resume follow-up cruising. If the start-off operatio n is not per-
formed, system control continues to keep your vehicle stopped.
When the turn signal lever is operated and your vehicle moves to an over-
taking lane while driving at 50 mph (80 km/h) or more, the vehi cle will
accelerate to help to overtake a passing vehicle.
The system’s identification of what is an overtaking lane may b e deter-
mined solely based on the location of the steering wheel in the vehicle (left
side driver position versus right side driver position.) If the vehicle is driven
to a region where the overtaking lane is on a different side fr om where the
vehicle is normally driven, the vehicle may accelerate when the turn signal
lever is operated in the opposite direction to the overtaking l ane (e.g., if the
driver normally operates the vehicle in a region where the overtaking lane
is to the right but then drives to a region where the overtaking lane is to the
left, the vehicle may accelerate when the right turn signal is activated).
Example of acceleration
When there are no longer any preceding vehicles driving slower
than the set speed
The system accelerates until the set speed is reached. The syst em then
returns to constant speed cruising.
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PRIUS_OM_OM47E09U_(U)
3414-5. Using the driving support systems
4
Driving
■Conditions under which the vehic le-to-vehicle distance control mode
may not function correctly
In the case of the following conditions, operate the brake peda l (or accelera-
tor pedal, depending on the situation) as necessary.
As the sensor may not be able to correctly detect vehicles ahead, the system
may not operate properly.
● When the vehicle ahead of you decelerates suddenly
● When driving on a road surrounded by a structure, such as in a tunnel or on
a bridge
● While the vehicle speed is decreasing to the set speed after th e vehicle
accelerates by depressing the accelerator pedal
●
When the road curves or when the lanes
are narrow
● When steering wheel operation or your
position in the lane is unstable

PRIUS_OM_OM47E09U_(U)
3674-5. Using the driving support systems
4
Driving
■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. 390
■ Sensor detection information
●The sensor’s detection areas are limited to the areas around th e 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 sens or.
● There will be a short delay between obstacle detection and disp lay. 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.

386
PRIUS_OM_OM47E09U_(U)
4-5. Using the driving support systems
S-APGS (Simple Adva nced Parking Guidance
System)

■Function summary
The Simple Advanced Parking Guidance System automatically
operates the steering wheel to provide support when backing int o
an area near a target parking spot, and when departing from a p ar-
allel parking spot. (Changing the shift position and speed adju st-
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 reach able, 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 obstacl e that could result in a collision, the
emergency brakes operate, regardl ess of whether the Parking Sup-
port Brake function is on or off. ( P. 388)
: If equipped
Simple Advanced Parking Guidance System
WARNING
●When backing up or proceeding forward, be sure to directly conf irm 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 s peed by
depressing the brake pedal.
● If it seems the vehicle may make contact with a pedestrian, ano ther vehi-
cle or any other obstacles, stop the vehicle by depressing the brake pedal,
and then press the S-APGS switch ( P. 389) to turn the system off.

390
PRIUS_OM_OM47E09U_(U)
4-5. Using the driving support systems
The guidance screen is displayed on the multi-information display.
Assistance level indicator
Displays a gauge indicating the
level until the vehicle’s stopping
position/the position at which assist
control ends.
Stop display
When illuminated, depress the
brake pedal and stop the vehicle at
once.
Operation display area
Displays the operating condition of the Simple Advanced Parking Guid-
ance System.
Advice display
Follow the instructions on the display and perform any indicate d opera-
tions. As an example, the illustration shows the display indica ting it is nec-
essary to depress the brake pedal in order to control the vehicle speed and
to confirm the safety of your surroundings.
S-APGS switch icon
Displayed when the assist mode can be changed and the system ca n be
turned off or on using the S-APGS switch.
Steering wheel auto operation display
Displays when the steering wheel auto operation is being perfor med.
Intuitive parking assist display/door position (open/close) display
P. 363
■S-APGS indicator inside the meter (P. 111 )
This indicator illuminates when the steering wheel auto operation is being
performed by the Simple Advanced Parking Guidance System. After control
ends, the indicator blinks for a short period of time and then turns off.
■ Intuitive parking assist pop-up display
While the Simple Advanced Parking Guidance System is operating, if the
intuitive parking assist detects an obstacle, the intuitive parking assist display
automatically pops up on the guidance screen ( P. 363), regardless of
whether the intuitive parking assist is on or off. (P. 362)
Guidance screen
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PRIUS_OM_OM47E09U_(U)
3914-5. Using the driving support systems
4
Driving
Assist mode will be can celed or stopped in the following cases.
■Assist control is canceled when
●The system temperature pres ervation function operates
● There is a system malfunction
● System determined that the parki ng environment is not suitable
for assist to continue
When assist control is canceled, firmly grasp the steering wheel,
depress the brake pedal and stop the vehicle.
Start again from the beginning, as the system will already be c an-
celed. When continuing to park manually, operate the steering
wheel as you normally would.
■Assist control is stopped when
● The steering wheel is operated
● The vehicle speed exceeds 4 mph (7 km/h) during assist control
● The Parking Support Brake function operates
When assist control is stopped, it can be resumed by following the
guidance shown on the screen.
■ If the vehicle speed is about to exceed the speed limit during assist con-
trol
Canceling or stopping assist mode
A buzzer sounds and the message indi-
cating there is possibility that the vehicle
speed may exceed the speed limit.
When the message is displayed, immedi-
ately depress the brake pedal to deceler-
ate. If the vehicle continues to accelerate,
assist control will be canceled when the
vehicle speed exceeds a certain speed.
( P. 413)