2023 TOYOTA PRIUS PRIME Owners Manual

3135-5. Using the driving support systems
5
Driving
The LDA system warns the
driver if the vehicle may deviate
from the current lane or course
*,
and also can slightly operate the
steering wheel to help avoid
deviation from the lane or
course
*.
The front camera is used to
detect lane lines or a course
*.
*: Boundary between the asphalt and grass, soil, et c., or structures,
such as a curb, guardrail, etc.
■Lane departure alert func-
tion
When the system determines
that the vehicle might depart
from its lane or course
*, a warn-
ing is displayed on a display,
and either a warning buzzer will
sound or the steering wheel will
vibrate to alert the driver.
Check the area around your vehicle
and carefully operate the steering
wheel to move the vehicle back to
the center of the lane or course
*.
Vehicles with BSM: If the system
determines that the vehicle may
collide with a vehicle in an adjacent
lane, the lane de parture alert will
operate even if the turn signals are
operating.
*: Boundary between the asphalt and grass, soil, et c., or structures, such as a curb, guardrail, etc.
■Lane departure prevention
function
If the system determines that
the vehicle is likely to depart
from its lane or course
*, it pro-
vides assistance through steer-
ing wheel operations to help
avoid deviation from the lane or
course.
If the system determines that the
steering wheel has not been oper-
ated for a certain amount of time or
the steering wheel is not being
firmly gripped, a warning message
may be displayed and a warning
buzzer may sound to alert the
driver.
Vehicles with BSM: If the system
determines that the vehicle may
collide with a vehicle in an adjacent
lane, the lane departure prevention
function will operate even if the turn
signals are operating.
LDA (Lane Departure
Alert)
Basic functions

3145-5. Using the driving support systems
*: Boundary between the asphalt and grass, soil, et c., or structures,
such as a curb, guardrail, etc.
■Break suggestion function
If the vehicle is swaying, a mes-
sage will be displayed and a
buzzer will sound to urge the
driver to take a break.
■Operating conditions of each
function
●Lane departure alert/prevention
function
This function is operable when all of
WARNING
■Before using the LDA system
●Do not overly rely on the LDA
system. The LDA system is not
a system which provides auto-
mated assistance in driving and
it is not a system which reduces
the amount of attention neces-
sary for safe driv ing. The driver
is solely responsible for paying
attention to their surroundings
and operating the steering
wheel as necessary to ensure
safety. Also, the driver is
responsible for taking adequate
breaks when fatigued, such as
when driving for a long time.
●Failure to perform appropriate
driving operations and pay care-
ful attention may lead to an
accident.

3155-5. Using the driving support systems
5
Driving
the following conditions are met:
• The vehicle speed is approxi-mately 30 mph (50 km/h) or more.
Operation may be possible when
the vehicle speed is approximately
25 mph (40 km/h) or more if vehi-
cles, motorcycles, bicycles, or
pedestrians are detected near the
lane.
• The system recognizes a lane or course
*. (When recognized on
only one side, the system will
operate only for the recognized
side.)
• The lane width is approximately
9.8 ft. (3 m) or more.
• The turn signal lever is not being operated.
(Vehicles with BSM: Except when a
vehicle is detected in the direction
that the turn signal lever is oper-
ated.)
• The vehicle is not being driven around a sharp curve.
• The vehicle is not accelerating or
decelerating more than a certain
amount.
• The steering wheel is not being turned sufficiently to perform a
lane change.
• When the VSC or TRAC system is not turned off
*: Boundary between the asphalt
and grass, soil, etc., or structures,
such as a curb, guardrail, etc.
■Temporary cancellation of func-
tions
When the operating conditions are
no longer met, a function may be
temporarily canceled. However,
when the operation conditions are
met again, operation of the function
will automatically be restored.
(  P.314)
■Operation of the lane departure
alert function/lane departure
prevention function
●Depending on the vehicle speed, road conditions, lane departure
angle, etc., operation of the lane
departure prevention function may
not be felt or the function may not
operate.
●Depending on the conditions, the
warning buzzer may operate even
if vibration is selected through a
customize setting.
●If a course* is not clear or straight,
the lane departure alert function or
lane departure prevention function
may not operate.
●The lane departure alert function
or lane departure prevention func-
tion may not operate if the system
judges that the vehicle is inten-
tionally being steered to avoid a
pedestrian or parked vehicle.
●Vehicles with BSM: It may not be
possible for the sys tem to judge if
there is danger of a collision with a
vehicle in an adjacent lane.
●Vehicles with a driver monitor
camera: Depending on the driver
condition, the lane departure alert
function or lane departure preven-
tion function changes the timing of
operation.
●The steering assist operation of
the lane departure prevention
function can be overridden by the
steering wheel operation of the
driver.
*: Boundary between the asphalt
and grass, soil, etc., or structures,
such as a curb, guardrail, etc.
■Hands off steering wheel warn-
ing operation
In the following si tuations, a mes-
sage urging the driver to operate the
steering wheel and an icon will be
displayed and a buzzer will sound to
warn the driver. When using the
system, make sure to grip the steer-
ing wheel firmly, regardless of
whether the warning is operating or
not.

3165-5. Using the driving support systems
●When the system determines that
the driver is not securely holding
the steering wheel, or the steering
wheel is not being operated when
the steering assist operation of the
lane departure prevention function
is operating
Except for Puerto Rico: The length
of time that the warning buzzer
operates will become longer as the
frequency of the steering assist
operating increase s. If the system
judges that the steering wheel has
been operated, the warning buzzer
will stop.
For Puerto Rico: The length of time
that the warning buzzer operates
will become longer as the frequency
of the steering assist operating
increases. Even if the system
judges that the steering wheel has
been operated, the warning buzzer
will sound for a certain amount of
time.
■Break suggestion function
This function is operable when all of
the following conditions are met:
●The vehicle speed is approxi-
mately 40 mph (65 km/h) or
more.
*1
●The vehicle speed is approxi-
mately 32 mph (50 km/h) or
more.
*2
●The lane width is approximately
9.8 ft. (3 m) or more.
Depending on the condition of the
vehicle and road surface, the break suggestion function may not oper-
ate.
Press the meter control switch
to turn off the message.
*1
Unless is pressed, the message
of the break suggestion function will
remain displayed.
*1
*1
: For Puerto Rico
*2: Except for Puerto Rico
 The LDA system can be
enabled/disabled through a
customize setting. ( P.627)
 The settings of the LDA can
be changed on the customize
settings. ( P.627)
Changing LDA settings
WARNING
■Situations in which the sys-
tem may not operate properly
In the following situations, the
system may not operate properly
and the vehicle may depart from
its lane. Do not overly rely on
these functions. The driver is
solely responsible for paying
attention to their surroundings
and operating the steering wheel
as necessary to ensure safety.

3175-5. Using the driving support systems
5
Driving
The operating state of the lane departure alert function and steering
assist operation of the lane departure prevention function are indi-
cated.
Except for Puerto Rico
WARNING
●When the boundary between
the asphalt and grass, soil, etc.,
or structures, such as a curb,
guardrail, etc. is not clear or
straight
●When the vehicle is struck by a
crosswind or the turbulence of
other nearby vehicles
●Situations in which the lane may
not be detected: P.291
●Situations in which the sensors
may not operate properly:
 P.289
●Situations in which some or all
of the functions of the system
cannot operate: P.291
●When it is necessary to disable
the system: P.284
Displays and system operation
IndicatorLane displaySteering iconCondition
Not illuminatedNot illuminatedNot illuminatedSystem disabled
WhiteGray
Not illuminated
Lane lines are not
detected by the system
WhiteWhite
Not illuminated
Lane lines are
detected by the system

3185-5. Using the driving support systems
For Puerto Rico
Yellow
FlashingYellow
FlashingNot illuminated
Lane departure alert function is
operating for the side which the lane display is flashing
GreenGreenGreen
Lane departure
prevention func- tion is operating
for the side which
the lane display is illuminated
Yellow
FlashingYellow
FlashingGreen
Lane departure alert func-
tion/lane depar- ture prevention
function is operat- ing for the side which the lane
display is flashing
IndicatorLane displaySteering iconSituation
Yellow
Illuminated
Not illumi- natedNot illumi- natedSystem disabled
Not illumi-nated
Gray
Not illumi-natedLane lines are not detected by
the system
Not illumi-nated
White
Not illumi-natedLane lines are detected by the
system
Yellow
FlashingYellow
Flashing
Not illumi- natedLane departure alert function
is operating for the side which
the lane display is flashing
IndicatorLane displaySteering iconCondition

3195-5. Using the driving support systems
5
Driving
GreenGreenGreen
Lane departure prevention
function is operating for the
side which the lane display is
illuminated
Yellow
FlashingYellow
FlashingGreen
Lane departure alert func-
tion/lane departure prevention
function is operating for the
side which the lane display is
flashing
IndicatorLane displaySteering iconSituation

3205-5. Using the driving support systems
PDA (Proactive driv-
ing assist)
When a detectable object
(P.321) is detected, the
proactive driving assist
operates the brakes and
steering wheel to help pre-
vent the vehicle from
approaching too close to
the object.
WARNING
■For safe use
Driving safely is solely the respon-
sibility of the driver.
●The proactive driving assist is
designed to provide some
assistance for regular braking
and steering operations, as well
as helping to prevent the vehicle
from approaching too close to a
detectable object. However, the
scope of this assistance is lim-
ited.
The driver should perform brake
and steering operations as neces-
sary. Read the following items
carefully. Do not overly rely on the
proactive driving assist and
always drive carefully. ( P.323)
●The proactive driving assist is
not a system which reduces the
amount of attention necessary
for safe driving. Even if the sys-
tem is operating correctly, the
surrounding conditions as rec-
ognized by the driver and
detected by the system may dif-
fer. It is necessary for the driver
to pay attention, assess risks,
and ensure safety. Over-reli-
ance on this system to drive the
vehicle safely may lead to an
accident resulting in death or
serious injury.
●Proactive driving assist is not a
system which allows for inatten-
tive driving and is not a system
which assists in poor visibility
conditions. The driver is solely
responsible for paying attention
to their surroundings and driving
safely.
■When turning proactive driv-
ing assist off
●Situations in which the sensors
may not operate properly:
 P.323
●When it is necessary to disable
the system: P.284