TOYOTA YARIS 2021 Owners Manual

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4-5. Using the driving support systems
Driving
■Situations in which the system may
not operate properly
●In some situations such as the follow-
ing, an object may not be detected by
the radar sensor and front camera,
preventing the system from operating
properly:
• When a detectable object is
approaching your vehicle
• When your vehicle or a detectable
object is wobbling
• If a detectable object makes an abrupt
maneuver (such as sudden swerving,
acceleration or deceleration)
• When your vehicle approaches a
detectable object rapidly
• When a detectable object is not
directly in front of your vehicle
• When a detectable object is near a
wall, fence, guardrail, manhole cover,
vehicle, steel plate on the road, etc.
• When a detectable object is under a
structure
• When part of a detectable object is
hidden by an object, such as large
baggage, an umbrella, or guardrail
• When there are many things which
can reflect the radio waves of the
radar in the vicinity (tunnels, truss
bridges, gravel roads, snow covered
road that have tracks, etc.)
• When there is an effect on the radio
waves to the radar that is installed on
another vehicle
• When multiple detectable objects are
close together
• If the sun or other light is shining
directly on a detectable object
• When a detectable object is a shade
of white and looks extremely bright
• When a detectable object appears to
be nearly the same color or brightness
as its surroundings• If a detectable object cuts or suddenly
emerges in front of your vehicle
• When the front of your vehicle is hit by
water, snow, dust, etc.
• When a very bright light ahead, such
as the sun or the headlights of oncom-
ing traffic, shines directly into the front
camera
• When approaching the side or front of
a vehicle ahead
• If a vehicle ahead is a motorcycle
• If a vehicle ahead is narrow, such as a
personal mobility vehicle
• If a preceding vehicle has a small rear
end, such as an unloaded truck
• If a preceding vehicle has a low rear
end, such as a low bed trailer
• If a vehicle ahead has extremely high
ground clearance
• If a vehicle ahead is carrying a load
which protrudes past its rear bumper
• If a vehicle ahead is irregularly
shaped, such as a tractor or side car
• If a vehicle ahead is a child sized bicy-
cle, a bicycle that is carrying a large
load, a bicycle ridden by more than
one person, or a uniquely shaped
bicycle (bicycle with a child seat, tan-
dem bicycle, etc.)
• If a pedestrian/or the riding height of a
bicyclist ahead is shorter than approx-
imately 1 m (3.2 ft.) or taller than
approximately 2 m (6.5 ft.)

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4-5. Using the driving support systems
• If a pedestrian/bicyclist is wearing
oversized clothing (a rain coat, long
skirt, etc.), making their silhouette
obscure
• If a pedestrian is bending forward or
squatting or bicyclist is bending for-
ward
• If a pedestrian/bicyclist is moving fast
• If a pedestrian is pushing a stroller,
wheelchair, bicycle or other vehicle
• When driving in inclement weather
such as heavy rain, fog, snow or a
sandstorm
• When driving through steam or smoke
• When the surrounding area is dim,
such as at dawn or dusk, or while at
night or in a tunnel, making a detect-
able object appear to be nearly the
same color as its surroundings
• When driving in a place where the sur-
rounding brightness changes sud-
denly, such as at the entrance or exit
of a tunnel
• After the engine has started the vehi-
cle has not been driven for a certain
amount of time
• While making a left/right turn and for a
few seconds after making a left/right
turn
• While driving on a curve and for a few
seconds after driving on a curve
• If your vehicle is skidding
• If the front of the vehicle is raised or
lowered
• If the wheels are misaligned
• If a wiper blade is blocking the front
camera
• The vehicle is being driven at
extremely high speeds
• When driving on a hill
• If the radar sensor or front camera is
misaligned
• When driving in a traffic lane sepa-rated by more than 2 lanes where
oncoming vehicles are driving while
making a right/left turn
• When largely out of place with the
opposite facing targeted oncoming
vehicle during a right/left turn
• While making a right/left turn, when a
pedestrian approaches from behind or
side of your vehicle
●In addition to the above, in some situ-
ations, such as the following, the
emergency steering assist may not
operate.
• When the white (yellow) lane lines are
difficult to see, such as when they are
faint, diverging/merging, or a shadow
is cast upon them
• When the lane is wider or narrower
than normal
• When there is a light and dark pattern
on the road surface, such as due to
road repairs
• When a pedestrian is detected near
the centerline of the vehicle
• When there is insufficient safe or
unobstructed space for the vehicle to
be steered into
• If oncoming vehicle is present
• If VSC function is operating
●In some situations such as the follow-
ing, sufficient braking force or steering
force may not be obtained, preventing
the system from performing properly:

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4-5. Using the driving support systems
Driving
• If the braking functions cannot operate
to their full extent, such as when the
brake parts are extremely cold,
extremely hot, or wet
• If the vehicle is not properly main-
tained (brakes or tires are excessively
worn, improper tire inflation pressure,
etc.)
• When the vehicle is being driven on a
gravel road or other slippery surface
• When the road surface has deep
wheel tracks
• When driving on a hill road
• When driving on a road that has
inclines to the left or right
■If VSC is disabled
●If VSC is disabled (→P.270), the pre-
collision brake assist and pre-collision
braking functions are also disabled.
●The PCS warning light will turn on and
“VSC Turned OFF Pre-Collision Brake
System Unavailable” will be displayed
on the multi-information display.
*: If equipped
LTA (Lane Tracing
Assist)
*
When driving on highways and
freeways with white (yellow)
lane lines, this function alerts
the driver when the vehicle
might depart from its lane or
course
* and provides assis-
tance by operating the steering
wheel to keep the vehicle in its
lane or course
*. Furthermore,
the system provides steering
assistance when dynamic
radar cruise control is operat-
ing to keep the vehicle in its
lane.
The LTA system recognizes
white (yellow) lane lines or a
course
* using the front cam-
era. Additionally, it detects pre-
ceding vehicles using the front
camera and radar.
*: Boundary between asphalt and the
side of the road, such as grass,
soil, or a curb

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4-5. Using the driving support systems
WARNING
■Before using LTA system
●Do not rely solely upon the LTA sys-
tem. The LTA system does not automatically drive the vehicle or reduce the amount of attention that
must be paid to the area in front of the vehicle. The driver must always assume full responsibility for driving
safely by paying careful attention to the surrounding conditions and operating the steering wheel to cor-
rect the path of the vehicle. Also, the driver must take adequate breaks when fatigued, such as from
driving for a long period of time.
●Failure to perform appropriate driv-
ing operations and pay careful attention may lead to an accident, resulting in death or serious injury.
●When not using the LTA system, use the LTA switch to turn the sys-
tem off.
■Situations unsuitable for LTA
system
In the following situations, use the LTA switch to turn the system off. Fail-
ure to do so may lead to an accident, resulting in death or serious injury.
●Vehicle is driven on a road surface which is slippery due to rainy weather, fallen snow, freezing, etc.
●Vehicle is driven on a snow-cov-ered road.
●White (yellow) lines are difficult to see due to rain, snow, fog, dust,
etc.
●Vehicle is driven in a temporary
lane or restricted lane due to con- struction work.
●Vehicle is driven in a construction zone.
●A spare tire, tire chains, etc., are equipped.
●When the tires have been exces-sively worn, or when the tire infla-tion pressure is low.
●When tires of a size other than specified are installed.
●Vehicle is driven in traffic lanes other than that highways and free-
ways.
●When your vehicle is towing a
trailer or during emergency towing
■Preventing LTA system malfunc-
tions and operations performed by mistake
●Do not modify the headlights or
place stickers, etc., on the surface of the lights.
●Do not modify the suspension, etc. If the suspension, etc., needs to be replaced, contact any authorized
Toyota retailer or Toyota authorized repairer, or any reliable repairer.
●Do not install or place anything on the hood or grille. Also, do not install a grille guard (bull bars, kan-
garoo bar, etc.).
●If your windshield needs repairs,
contact any authorized Toyota retailer or Toyota authorized repairer, or any reliable repairer.
■Conditions in which functions may not operate properly
In the following situations, the func- tions may not operate properly and the vehicle may depart from its lane.
Drive safely by always paying careful attention to your surroundings and operate the steering wheel to correct
the path of the vehicle without relying solely on the functions.

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4-5. Using the driving support systems
Driving
WARNING
●When the follow-up cruising dis- play is displayed ( →P.209) and the
preceding vehicle changes lanes. (Your vehicle may follow the pre-ceding vehicle and also change
lanes.)
●When the follow-up cruising dis-
play is displayed ( →P.209) and the preceding vehicle is swaying. (Your vehicle may sway accordingly and
depart from the lane.)
●When the follow-up cruising dis-
play is displayed ( →P.209) and the preceding vehicle departs from its lane. (Your vehicle may follow the
preceding vehicle and depart from the lane.)
●When the follow-up cruising dis-play is displayed ( →P.209) and the preceding vehicle is being driven
extremely close to the left/right lane line. (Your vehicle may follow the preceding vehicle and depart from
the lane.)
●Vehicle is being driven around a
sharp curve.
●Objects or patterns that could be mistaken for white (yellow) lines are present on the side of the road
(guardrails, reflective poles, etc.).
●Vehicle is driven where the road
diverges, merges, etc.
●Repair marks of asphalt, white (yel- low) lines, etc., are present due to
road repair.
●There are shadows on the road that
run parallel with, or cover, the white (yellow) lines.

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4-5. Using the driving support systems
■Lane departure alert function
When the system determines that
the vehicle might depart from its
lane or course*, a warning is dis-
played on the multi-information dis-
play, and either a warning buzzer
will sound or the steering wheel will
vibrate to alert the driver.
When the warning buzzer sounds or
the steering wheel vibrates, check the
area around your vehicle and carefully
WARNING
●The vehicle is driven in an area without white (yellow) lines, such as
in front of a tollgate or checkpoint, or at an intersection, etc.
●The white (yellow) lines are cracked, “Raised pavement marker” or stones are present.
●The white (yellow) lines cannot be seen or are difficult to see due to
sand, etc.
●The vehicle is driven on a road sur-
face that is wet due to rain, pud- dles, etc.
●The traffic lines are yellow (which may be more difficult to recognize than lines that are white).
●The white (yellow) lines cross over a curb, etc.
●The vehicle is driven on a bright surface, such as concrete.
●If the edge of the road is not clear or straight.
●The vehicle is driven on a surface that is bright due to reflected light,
etc.
●The vehicle is driven in an area
where the brightness changes sud- denly, such as at the entrances and exits of tunnels, etc.
●Light from the headlights of an oncoming vehicle, the sun, etc.,
enters the camera.
●The vehicle is driven on a slope.
●The vehicle is driven on a road which tilts left or right, or a winding
road.
●The vehicle is driven on an
unpaved or rough road.
●The traffic lane is excessively nar-
row or wide.
●The vehicle is extremely tilted due to carrying heavy luggage or having improper tire pressure.
●The distance to the preceding vehi-cle is extremely short.
●The vehicle is moving up and down a large amount due to road condi-
tions during driving (poor roads or road seams).
●When driving in a tunnel or at night with the headlights off or when a headlight is dim due to its lens
being dirty or it being misaligned.
●The vehicle is struck by a cross-
wind.
●The vehicle is affected by wind from
a vehicle driven in a nearby lane.
●The vehicle has just changed lanes
or crossed an intersection.
●Tires which differ by structure, man-
ufacturer, brand or tread pattern are used.
●Snow tires, etc., are equipped.
●The vehicle is being driven at
extremely high speeds.
Functions included in LTA
system

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4-5. Using the driving support systems
Driving
operate the steering wheel to move the
vehicle back to the center of the lane.
Vehicle with BSM: When the system
determines that the vehicle might
depart from its lane and that the possi-
bility of a collision with an overtaking
vehicle in the adjacent lane is high, the
lane departure alert will operate even if
the turn signals are operating.
*: Boundary between asphalt and the
side of the road, such as grass, soil,
or a curb
■Steering assist function
When the system determines that
the vehicle might depart from its
lane or course
*, the system pro-
vides assistance as necessary by
operating the steering wheel in
small amounts for a short period of
time to keep the vehicle in its lane.
Vehicle with BSM: When the system
determines that the vehicle might
depart from its lane and that the possi-bility of a collision with an overtaking
vehicle in the adjacent lane is high, the
steering assist function will operate
even if the turn signals are operating.
*: Boundary between asphalt and the
side of the road, such as grass, soil,
or a curb
■Vehicle sway warning function
When the vehicle is swaying within
a lane, the warning buzzer will
sound and a message will be dis-
played on the multi-information dis-
play to alert the driver.

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4-5. Using the driving support systems
■Lane centering function
This function is linked with dynamic
radar cruise control and provides
the required assistance by operat-
ing the steering wheel to keep the
vehicle in its current lane.
When dynamic radar cruise control is
not operating, the lane centering func-
tion does not operate.
In situations where the white (yellow)
lane lines are difficult to see or are not
visible, such as when in a traffic jam,
this function will operate to help follow a
preceding vehicle by monitoring the
position of the preceding vehicle.
■Changing the lane centering
function ON/OFF condition
The lane centering function turns
ON/OFF each time the LTA switch
is pressed.
The LTA settings state is displayed on
the multi-information display when the
LTA switch is pressed.
Also, the LTA function can be turned
ON/OFF with on the multi-informa-
tion display. ( →P.422)
LTA system setting

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4-5. Using the driving support systems
Driving
Lane centering function ON
“LTA Steering Assist Active Lane
Centering Active”
Lane centering function OFF
“LTA Steering Assist Active”
■Turning the LTA system OFF
Press and hold the LTA switch
The LTA indicator light turns off when
the LTA is turned OFF.
Press the switch again to turn the sys-
tem on.
The LTA is turned ON each time the
engine switch is turned to ON.
However, the lane centering function
keeps either the ON/OFF state prior to
the engine switch being turned OFF.
LTA indicator
The illumination condition of the indica-
tor informs the driver of the system
operation status.
Illuminated in white: LTA system is
operating.
Illuminated in green: Steering wheel
assistance of the steering assist func-
tion or lane centering function is operat-ing.
Flashing in orange: Lane departure
alert function is operating.
Operation display of steering
wheel operation support
Displayed when the multi-information
display is switched to the driving sup-
port system information screen.
Indicates that steering wheel assis-
tance of the steering assist function or
lane centering function is operating.
Both outer sides of the lane are dis-
played: Indicates that steering wheel
assist of the lane centering function is
operating.
One outer side of the lane is displayed:
Indicates that steering wheel assist of
the steering assist function is operating.
Both outer sides of the lane are flash-
ing: Alerts the driver that their input is
necessary to stay in the center of the
lane (lane centering function).
Follow-up cruising display
Displayed when the multi-information
display is switched to the driving sup-
port system information screen.
Indicates that steering assist of the lane
centering function is operating by moni-
toring the position of a preceding vehi-
cle.
When the follow-up cruising display is
displayed, if the preceding vehicle
moves, your vehicle may move in the
same way. Always pay careful attention
to your surroundings and operate the
steering wheel as necessary to correct
the path of the vehicle and ensure
safety.
Lane departure alert function
display
Indications on multi-infor-
mation display

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Displayed when the multi-information
display is switched to the driving sup-
port system information screen.
Inside of displayed lines is white
Indicates that the system is recog-
nizing white (yellow) lines or a
course
*. When the vehicle departs
from its lane, the white line dis-
played on the side the vehicle
departs from flashes orange.
Inside of displayed lines is black
Indicates that the system is not able
to recognize white (yellow) lines or
a course
* or is temporarily can-
celed.
*: Boundary between asphalt and the
side of the road, such as grass, soil,
or a curb
■Operation conditions of each func-
tion
●Lane departure alert function
This function operates when all of the
following conditions are met.
• LTA is turned on.
• Vehicle speed is approximately 50
km/h (32 mph) or more.
*1
• System recognizes white (yellow) lane
lines or a course*2. (When a white
[yellow] line or course*2 is recognized
on only one side, the system will oper-
ate only for the recognized side.)
• Width of traffic lane is approximately 3
m (9.8 ft.) or more.
• Turn signal lever is not operated.
(Vehicle with BSM: Except when
another vehicle is in the lane on the side
where the turn signal was operated)
• Vehicle is not being driven around a
sharp curve.
• No system malfunctions are detected.
(→P.212)
*1: The function operates even if the
vehicle speed is less than approxi-
mately 50 km/h (32 mph) when the
lane centering function is operating.
*2: Boundary between asphalt and the
side of the road, such as grass, soil,
or a curb
●Steering assist function
This function operates when all of the
following conditions are met in addition
to the operation conditions for the lane
departure alert function.
• Vehicle is not accelerated or deceler-
ated by a fixed amount or more.
• Steering wheel is not operated with a
steering force level suitable for chang-
ing lanes.
• ABS, VSC, TRC and PCS are not
operating.
• TRC or VSC is not turned off.
• Hands off steering wheel warning is
not displayed. (→P.212)
●Vehicle sway warning function