Toyota Sienna (2019 year). Instruction

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Cancelation of the pre-collision braking
If either of the following occur while the pre-collision braking function is oper-
ating, it will be canceled:

The accelerator pedal is depressed strongly.

The steering wheel is turned sharply or abruptly.

Conditions under which the system may operate even if there is no pos-
sibility of a collision

In some situations such as the following, the system may determine that
there is a possibility of a frontal collision and operate.
• When passing a vehicle or pedestrian
• When changing lanes while overtaking a preceding vehicle
• When overtaking a preceding vehicle that is changing lanes

• When rapidly closing on a vehicle ahead
• If the front of the vehicle is raised or lowered, such as when the road sur-

face is uneven or undulating

• When approaching objects on the roadside, such as guardrails, utility

poles, trees, or walls

• When overtaking a preceding vehicle

that is making a left/right turn

• When passing a vehicle in an oncom-

ing lane that is stopped to make a
right/left turn

• When driving on a road where relative

location to vehicle ahead in an adja-
cent lane may change, such as on a
winding road

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• When driving on a narrow path surrounded by a structure, such as in a

tunnel or on an iron bridge

• When there is a metal object (manhole cover, steel plate, etc.), steps, or a

protrusion on the road surface or roadside

• When rapidly closing on an electric toll gate barrier, parking area barrier,

or other barrier that opens and closes

• When using an automatic car wash

• When there is a vehicle, pedestrian,

or object by the roadside at the
entrance of a curve

• When

crossing

pedestrian

approaches very close to the vehicle

• When passing through a place with a

low structure above the road (low ceil-
ing, traffic sign, etc.)

• When passing under an object (bill-

board, etc.) at the top of an uphill road

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• When the vehicle is hit by water, snow, dust, etc. from a vehicle ahead
• When driving through steam or smoke
• When there are patterns or paint on the road or a wall that may be mis-

taken for a vehicle or pedestrian

• When driving near an object that reflects radio waves, such as a large

truck or guardrail

• When driving near a TV tower, broadcasting station, electric power plant,

or other location where strong radio waves or electrical noise may be
present

Situations in which the system may not operate properly

In some situations such as the following, a vehicle may not be detected by
the radar sensor and camera sensor, preventing the system from operating
properly:
• If an oncoming vehicle is approaching your vehicle
• If a vehicle ahead is a motorcycle or bicycle
• When approaching the side or front of a vehicle
• If a preceding vehicle has a small rear end, such as an unloaded truck

• 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 the sun or other light is shining directly on a vehicle ahead
• If a vehicle cuts in front of your vehicle or emerges from beside a vehicle

• When driving through or under

objects that may contact the vehicle,
such as thick grass, tree branches, or
a banner

• If a preceding vehicle has a low rear

end, such as a low bed trailer

• If a vehicle ahead has extremely high

ground clearance

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• If a vehicle ahead makes an abrupt maneuver (such as sudden swerving,

acceleration or deceleration)

• When suddenly cutting behind a preceding vehicle

• When driving in inclement weather such as heavy rain, fog, snow or a

sandstorm

• When the vehicle is hit by water, snow, dust, etc. from a vehicle ahead
• When driving through steam or smoke
• When driving in a place where the surrounding brightness changes sud-

denly, such as at the entrance or exit of a tunnel

• When a very bright light, such as the sun or the headlights of oncoming

traffic, shines directly into the camera sensor

• When the surrounding area is dim, such as at dawn or dusk, or while at

night or in a tunnel

• After the engine has started the vehicle 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 wheels are misaligned
• If a wiper blade is blocking the camera sensor
• The vehicle is wobbling.
• The vehicle is being driven at extremely high speeds.
• When driving on a hill
• If the radar sensor or camera sensor is misaligned

• When a vehicle ahead is not directly

in front of your vehicle

• If the front of the vehicle is raised or

lowered

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In some situations such as the following, sufficient braking force may not be
obtained, preventing the system from performing properly:
• 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 maintained (brakes or tires are excessively

worn, improper tire inflation pressure, etc.)

• When the vehicle is being driven on a gravel road or other slippery sur-

face

Some pedestrians such as the following may not be detected by the radar
sensor and camera sensor, preventing the system from operating properly:
• Pedestrians shorter than approximately 3.2 ft. (1 m) or taller than approx-

imately 6.5 ft. (2 m)

• Pedestrians wearing oversized clothing (a rain coat, long skirt, etc.), mak-

ing their silhouette obscure

• Pedestrians who are carrying large baggage, holding an umbrella, etc.,

hiding part of their body

• Pedestrians who are bending forward or squatting
• Pedestrians who are pushing a stroller, wheelchair, bicycle or other vehi-

cle

• Groups of pedestrians which are close together
• Pedestrians who are wearing white and look extremely bright
• Pedestrians in the dark, such as at night or while in a tunnel
• Pedestrians whose clothing appears to be nearly the same color or

brightness as their surroundings

• Pedestrians near walls, fences, guardrails, or large objects
• Pedestrians who are on a metal object (manhole cover, steel plate, etc.)

on the road

• Pedestrians who are walking fast
• Pedestrians who are changing speed abruptly
• Pedestrians running out from behind a vehicle or a large object
• Pedestrians who are extremely close to the side of the vehicle (outside

rear view mirror, etc.)

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If the PCS warning light flashes or illuminates and a warning message is
displayed on the multi-information display
The pre-collision system may be temporarily unavailable or there may be a
malfunction in the system.

In the following situations, the warning light will turn off, the message will
disappear and the system will become operational when normal operating
conditions return:
• When the radar sensor or camera sensor or the area around either sen-

sor is hot, such as in the sun

• When the radar sensor or camera sensor or the area around either sen-

sor is cold, such as in an extremely cold environment

• When a front sensor is dirty or covered with snow, etc.
• When the part of the windshield in front of the camera sensor is fogged up

or covered with condensation or ice (Defogging the windshield:

P. 336)

• If the camera sensor is obstructed, such as when the hood is open or a

sticker is attached to the windshield near the camera sensor

If the PCS warning light continues to flash or remains illuminated or the
warning message does not disappear even though the vehicle has returned
to normal, the system may be malfunctioning. Have the vehicle inspected by
your Toyota dealer immediately.

If VSC is disabled

If VSC is disabled (

P. 324), 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.

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LDA (Lane Departure Alert with steering

control)

When driving on highways and freeways with white (yellow) lines, this
function alerts the driver when the vehicle might depart from its lane
and provides assistance by operating the steering wheel to keep the
vehicle in its lane.
The LDA system recognizes visi-
ble white (yellow) lines with the
camera sensor on the upper por-
tion of the front windshield.

Lane departure alert function

When  the  system  determines
that  the  vehicle  might  depart
from  its  lane,  a  warning  is  dis-
played  on  the  multi-information
display and the warning buzzer
sounds to alert the driver.

When  the  warning  buzzer
sounds,  check  the  surrounding
road  situation  and  carefully
operate  the  steering  wheel  to
move  the  vehicle  back  to  the
center of the lane.

Summary of functions

Functions included in LDA system

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Steering control function

When  the  system  determines
that  the  vehicle  might  depart
from  its  lane,  the  system  pro-
vides  assistance  as  necessary
by operating the steering wheel
in  small  amounts  for  a  short
period of time to keep the vehi-
cle in its lane.

If  the  system  detects  that  the
steering  wheel  has  not  been
operated  for  a  fixed  amount  of
time or the steering wheel is not
being  firmly  gripped,  a  warning
is  displayed  on  the  multi-infor-
mation  display  and  the  function
is temporarily canceled.

Vehicle sway warning function

When the vehicle is swaying or
appears as if it may depart from
its  lane  multiple  times,  the
warning  buzzer  sounds  and  a
message  is  displayed  on  the
multi-information display to alert
the driver.

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WARNING

Before using LDA system
Do not rely solely upon the LDA system. The LDA system does not auto-
matically 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 surround-
ing conditions and operating the steering wheel to correct 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 driving operations and pay careful attention
may lead to an accident, resulting in death or serious injury.

To avoid operating LDA system by mistake
When not using the LDA system, use the LDA switch to turn the system off.

Situations unsuitable for LDA system
Do not use the LDA system in the following situations.
The system may not operate properly and lead to an accident, resulting in
death or serious injury.

A spare tire, tire chains, etc. are equipped.

When the tires have been excessively worn, or when the tire inflation pres-
sure is low.

Tires which differ by structure, manufacturer, brand or tread pattern are
used.

Objects or patterns that could be mistaken for white (yellow) lines are
present on the side of the road (guardrails, curbs, reflective poles, etc.).

Vehicle is driven on a snow-covered road.

White (yellow) lines are difficult to see due to rain, snow, fog, dust, etc.

Asphalt repair marks, white (yellow) line marks, etc. are present due to
road repair.

Vehicle is driven in a temporary lane or restricted lane due to construction
work.

Vehicle is driven on a road surface which is slippery due to rainy weather,
fallen snow, freezing, etc.

Vehicle is driven in traffic lanes other than on highways and freeways.

Vehicle is driven in a construction zone.

Vehicle is towing a trailer or another vehicle.

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Press the LDA switch to turn the
LDA system on.

The  LDA  indicator  illuminates  and
a  message  is  displayed  on  the
multi-information display.
Press the LDA switch again to turn
the LDA system off.
When the LDA system is turned on
or off, operation of the LDA system
continues  in  the  same  condition
the next time the engine is started.

WARNING

Preventing LDA system malfunctions 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 your Toyota dealer.

Do not install or place anything on the hood or grille. Also, do not install a
grille guard (bull bars, kangaroo bar, etc.).

If your windshield needs repairs, contact your Toyota dealer.

Turning LDA system on

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LDA indicator
The illumination condition of the
indicator informs the driver of
the system operation status.

Illuminated in white:
LDA system is operating.
Illuminated in green:
Steering  wheel  assistance  of  the
steering  control  function  is  operat-
ing.
Flashing in amber:
Lane  departure  alert  function  is
operating.

Operation display of steering wheel operation support
Indicates that steering wheel assistance of the steering control
function is operating.
Lane departure alert function display
Displayed when the multi-information display is switched to the
driving assist system information screen.

Indications on multi-information display



Inside of displayed white lines
is white



Inside of displayed white lines
is black

Indicates that the system is recog-
nizing  white  (yellow)  lines.  When
the  vehicle  departs  from  its  lane,
the  white  line  displayed  on  the
side  the  vehicle  departs  from
flashes amber.

Indicates that the system is not
able to recognize white (yellow)
lines or is temporarily canceled.

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Operation conditions of each function

Lane departure alert function
This function operates when all of the following conditions are met.
• LDA is turned on.
• Vehicle speed is approximately 32 mph (50 km/h) or more.
• System recognizes white (yellow) lines.
• Width of traffic lane is approximately 9.8 ft. (3 m) or more.
• Turn signal lever is not operated.
• Vehicle is driven on a straight road or around a gentle curve with a radius

of more than approximately 492 ft. (150 m).

• No system malfunctions are detected. (

P. 287)

Steering control function
This function operates when all of the following conditions are met in addi-
tion to the operation conditions for the lane departure alert function.

• Setting for “Steering Assist” in

on the multi-information display is

set to “On”. (

P. 92)

• Vehicle is not accelerated or decelerated by a certain amount or more.
• Steering wheel is not operated with a steering force level suitable for

changing lanes.

• ABS, VSC, TRAC and PCS are not operating.
• TRAC or VSC is not turned off.
• Hands off steering wheel warning is not displayed.(

P. 285)

Vehicle sway warning function
This function operates when all of the following conditions are met.

• Setting for “Sway Warning” in

on the multi-information display is

set to “On”. (

P. 92)

• Vehicle speed is approximately 32 mph (50 km/h) or more.
• Width of traffic lane is approximately 9.8 ft. (3 m) or more.
• No system malfunctions are detected. (

P. 287)

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Temporary cancellation of functions
When the operation conditions are no longer met, a function may be tempo-
rarily canceled. However, when the operation conditions are met again, oper-
ation of the function is automatically restored. (

P. 284)

Steering control 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.

Lane departure alert function
The warning buzzer may be difficult to hear due to external noise, audio play-
back, etc.

Hands off steering wheel warning

Depending on the vehicle and road conditions, the warning may not operate.

Vehicle sway warning function

Depending on the vehicle and road conditions, the warning may not operate.

White (yellow) lines are only on one side of road
The LDA system will not operate for the side on which white (yellow) lines
could not be recognized.

When  the  system  determines  that  the
driver  has  removed  their  hands  from  the
steering  wheel  while  the  steering  control
function is operating, a warning message
urging  the  driver  to  hold  the  steering
wheel and the symbol shown in the illus-
tration are displayed on the multi-informa-
tion display.
If the driver continues to keep their hands
off of the steering wheel, a warning mes-
sage and the symbol shown in the illustra-
tion are displayed on the multi-information
display,  and  the  function  is  temporarily
canceled.  This  warning  also  operates  in
the  same  way  when  the  driver  continu-
ously  operates the  steering  wheel  only a
small  amount.  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.

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Conditions in which functions may not operate properly
In the following situations, the camera sensor may not detect white (yellow)
lines and various functions may not operate normally.

There are shadows on the road that run parallel with, or cover, the white
(yellow) lines.

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, “Botts’ dots”, “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 surface that is wet due to rain, puddles, 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.

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 suddenly,
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 where the road diverges, merges, etc.

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 vehicle is driven around a sharp curve.

The traffic lane is excessively narrow or wide.

The vehicle is extremely tilted due to carrying heavy luggage or having
improper tire pressure.

The distance to the preceding vehicle is extremely short.

The vehicle is moving up and down a large amount due to road conditions
during driving (poor roads or road seams).

The headlight lenses are dirty and emit a faint amount of light at night, or the
beam axis has deviated.

The vehicle is struck by a crosswind.

The vehicle has just changed lanes or crossed an intersection.

Snow tires, etc. are equipped.

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Warning message
If the following warning message is displayed on the multi-information display
and the LDA indicator illuminates in amber, follow the appropriate trouble-
shooting procedure.

If a different warning message is displayed, follow the instructions displayed
on the screen.

Warning message

Details/Actions

“Lane Departure

Alert

Malfunction

Contact Your Dealer”

The system may not be operating properly.

 Have the vehicle inspected at your Toyota

dealer.

“Front Camera

Unavailable Remove

Debris On Windshield”

Dirt, rain, condensation, ice, snow, etc. are pres-
ent on the windshield in front of the camera sen-
sor.

 Turn the LDA system off, remove any dirt,

rain, condensation, ice, snow, etc. from
the windshield, and then turn the LDA
system back on.

“Front Camera

Unavailable”

The operation conditions of the camera sensor
(temperature, etc.) are not met.

 When the operation conditions of the

camera  sensor  (temperature,  etc.)  are
met,  the  LDA  system  will  become  avail-
able.  Turn  the  LDA  system  off,  wait  for  a
little while, and then turn the LDA system
back on.

“Lane Departure

Alert Unavailable”

The LDA system is temporarily canceled due to
a malfunction in a sensor other than the camera
sensor.

 Turn the LDA system off and follow the

appropriate troubleshooting procedures
for the warning message. Afterward, drive
the vehicle for a short time, and then turn
the LDA system back on.

“Lane Departure

Alert

Unavailable

Below Approx

32 MPH”

The LDA system cannot be used as the vehicle
speed is less than approximately 32 mph (50
km/h).

 Drive the vehicle at approximately 32 mph

(50 km/h) or more.

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Customization
The following settings can be changed.

For how to change settings, refer to P. 540

Function

Setting details

Lane departure alert function

Adjust alert sensitivity

Steering control function

Turn steering wheel assistance on and off

Vehicle sway warning function

Turn function on and off

Adjust alert sensitivity

Toyota Sienna (2019 year). Instruction - part 18