Lexus RX Owners Manual (RX450h): LKA (Lane-Keeping Assist)

Summary of functions

When driving on highways and freeways with white or 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. Furthermore, the system also provides steering assistance when dynamic radar cruise control with full-speed range is operating to keep the vehicle in its lane.

The LKA system recognizes visible white or yellow lines with the camera sensor on the upper portion of the windshield.

Lexus RX. Using the driving support systems

Functions included in LKA system

Lane departure alert function

When the system determines that the vehicle might depart from its lane, a warning is displayed on the multi-information display, and either the warning buzzer sounds or the steering wheel vibrates to alert the driver.

When the warning buzzer sounds or the steering wheel vibrates, check the surrounding road situation and carefully operate the steering wheel to move the vehicle back to the center within the white (yellow) lines.

Lexus RX. Using the driving support systems

Steering assist function

When the system determines that the vehicle might depart from its lane, the system provides assistance as necessary by operating the steering wheel in small amounts for a short period of time to keep the vehicle 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-information display and the warning buzzer sounds.

Lexus RX. Using the driving support systems

Vehicle sway warning

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.

Lexus RX. Vehicle sway warning

Lane centering function

This function is linked with radar cruise control and provides the required assistance by operating the steering wheel to keep the vehicle in its current lane.

When radar cruise control is not operating, the lane centering function does not operate.

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-information display and the warning buzzer sounds.

Lexus RX. Lane centering function

WARNING

■ Before using LKA system Do not rely solely upon the LKA system. LKA is not a system which automatically drives the vehicle or reduces 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 always paying careful attention to the surrounding conditions and operate the steering wheel to correct the path of the vehicle. Also, make sure to 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 LKA by mistake When not using the LKA system, use the LKA switch to turn the system off.

■ Situations unsuitable for LKA Do not use the LKA 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 pressure 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.
  • When your vehicle is towing a trailer or during emergency towing

■ Preventing LKA 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 Lexus 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 Lexus dealer.

Turning LKA system on

Press the LKA switch to turn the LKA system on.

The LKA indicator illuminates and a message is displayed on the multi-information display.

Press the LKA switch again to turn the LKA system off.

When the LKA system is turned on or off, operation of the LKA system continues in the same condition the next time the hybrid system is started.

Lexus RX. Using the driving support systems

Indications on the multi-information display

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

    Illuminated in white: LKA system is operating.

    Illuminated in green: Steering wheel assistance of the steering assist function or lane centering function is operating.

    Flashing in amber: Lane departure alert function is operating.

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

Lexus RX. Using the driving support systems

Inside of displayed white lines is white

Lexus RX. Using the driving support systems

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

Inside of displayed white lines is black

Lexus RX. Using the driving support systems

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

■ Operation conditions of each function

  • Lane departure alert function
    This function operates when all of the following conditions are met.
    • LKA 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.
  • 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.
    • Setting for "Steering Assist" in of the multi-information display is set to "On".
    • Vehicle is not accelerated or decelerated by a fixed 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
    This function operates when all of the following conditions are met.
    • Setting for "Sway Warning" in of the multi-information display is set to "On".
    • 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.
  • Lane centering function
    This function operates when all of the following conditions are met.
    • LKA is turned on.
    • Setting for "Lane Center" in of the multi-information display are set to "On".
    • System recognizes white (yellow) lines.
    • Dynamic radar cruise control with full-speed range is operating.
    • Width of traffic lane is approximately 8.2 to 13.5 ft. (2.5 to 4.1 m).
    • 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 656 ft. (200 m).
    • No system malfunctions are detected.
    • Vehicle does not accelerate or decelerate by a fixed 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.
    • Steering assist function is not operating.

■ Temporary cancellation 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.

■ Steering assist function/lane centering function Depending on the vehicle speed, lane departure situation, road conditions, etc., the operation of the functions may not be recognized or the functions may not operate.

■ Lane departure alert function The warning buzzer may be difficult to hear due to external noise, audio playback, etc.

Also, it may be difficult to feel steering wheel vibrations due to the road conditions, etc.

■ Hands off steering wheel alert When the system determines that the driver has removed their hands from the steering wheel while the steering assist function or lane centering function is operating, a warning message is displayed on the multi-information display and the buzzer sounds.

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

■ 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.

■ Customization Some functions can be customized.

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