Get Using the driving support systems -> LDA (Lane Departure Alert with steering control) Guide for Toyota Prius 4 Door Fourth Generation (2016-2022)

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4-5. Using the driving support systems

LDA (Lane Departure Alert with steering

control)^

Summary of functions

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.

: If equipped

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4-5. Using the driving support systems

Functions included in LDA system

◆ 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.

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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 warning

buzzer sounds.

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4-5. Using the driving support systems

◆ 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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4-5. Using the driving support systems

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.

4

●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.

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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

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 hybrid system is

started.

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Indications on combination meter

1

LDA indicator

Illuminates when the LDA system

is on.

2

Steering control indicator and

operation display of steering

wheel operation support

When that steering wheel assis-

tance of the steering control func-

tion is operating, the indicator

illuminates and the operation dis-

play on the multi-information dis-

play is turned on.

3

Lane departure alert function

display

4

Displayed when the multi-information display is switched to the

screen. (P. 148)

 Inside of displayed white lines  Inside of displayed white lines

is white is black

Indicates that the system is recog- Indicates that the system is not

nizing white (yellow) lines. When able to recognize white (yellow)

the vehicle departs from its lane, lines or is temporarily canceled.

the white line displayed on the

side the vehicle departs from

flashes orange.

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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. 313)

●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

(“LDA Steering Assist Mode”) in the

screen of

the multi-information display is set to “On”. (P. 122)

• 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.

●Vehicle sway warning function

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

• Setting for

(“Lane Sway Warning Status”) in the

screen of

the multi-information display is set to “On”. (P. 122)

• 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. 313)

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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. 310)

■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

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.

4

If the driver continues to keep their hands off of the steering wheel, a buzzer

sounds and a warning message and the symbol shown in the illustration are

displayed on the multi-information display. This warning also operates in the

same way when the driver continuously operates the steering wheel only a

small amount. Always keep your hands on the steering wheel when using this

system, regardless of warnings.

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

■Vehicle sway warning function

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.

■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.

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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 dis-

play, follow the appropriate troubleshooting procedure.

Warning message

Details/Actions

The system may not be operating

properly.

 Have the vehicle inspected at your

Toyota dealer.

“Lane Departure Alert

Malfunction

Visit Your Dealer”

Dirt, rain, condensation, ice, snow,

etc. are present on the windshield in

front of the camera sensor.

 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

See Owner’s Manual”

The operation conditions of the cam-

era sensor (temperature, etc.) are not

met.

4

 When the operation conditions of

the camera sensor (temperature,

etc.) are met, the LDA system will

become available. Turn the LDA

system off, wait for a little while,

and then turn the LDA system back

on.

“Front Camera

Unavailable”

The LDA system is temporarily can-

celed 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 mes-

sage. Afterward, drive the vehicle

for a short time, and then turn the

LDA system back on.

“Lane Departure Alert

Unavailable”

The LDA system cannot be used as

the vehicle speed is less than approxi-

mately 32 mph (50 km/h).

 Drive the vehicle at approximately

32 mph (50 km/h) or more.

“Lane Departure Alert

System is Unavailable

Below Approx.

32 MPH.”

If a different warning message is displayed, follow the instructions displayed

on the screen.

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■Customization

The following settings can be changed.

Function

Setting details

Lane departure alert function

Adjust alert sensitivity

Steering control function

Turn steering wheel assistance on and off

Turn function on and off

Vehicle sway warning function

Adjust alert sensitivity

For how to change settings, refer to P. 149.

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Using the driving support systems -> LDA (Lane Departure Alert with steering control) for Your Toyota Prius 4 Door Fourth Generation (2016-2022)

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