OUTLINE
The lane departure alert (LDA) system uses a forward recognition camera to detect lane markers on the road surface, assists the driver's steering operation by using the warning buzzer, steering vibration and electric power steering, and activates the lane departure warning when needed.
The lane departure alert system also operates on roads with lane markers located on both sides of the vehicle.
Tech Tips
However, some functions only operate on roads with lane markers on one side of the vehicle.
The lane departure alert system is controlled by the forward recognition camera.
The lane departure alert system has a last memory function which memorizes the state of the LDA main switch just before the power switch is turned off and resumes the previous state when the power switch is turned on (IG) again.
PRECAUTION
General Handling Precautions
Use the lane departure alert system with clear lane markers.
The lane departure alert system uses a forward recognition camera to recognize lane markers. The lane departure alert system does not operate when lane markers cannot be recognized. Also, since unnecessary steering force and warning sounds may be produced when lane markers are not properly recognized, make sure to drive appropriately using the steering wheel even when using the lane departure alert system. However, the steering force generated is small and does not interfere with operation of the vehicle.
Keep the windshield glass clean around the area where the forward recognition camera is mounted. The performance of the forward recognition camera may be affected if dirt, raindrops, condensation, or snow is on the windshield glass.
Do not attach stickers or labels, nor affix any ornaments to the windshield glass.
Do not touch the lens of the forward recognition camera. Fingerprints left on the lens may cause inaccurate detection or non-detection and lane markers may not be detected accurately.
Do not remove the forward recognition camera. Since the angle of the forward recognition camera is precisely adjusted, angle adjustment must be performed after the forward recognition camera is reinstalled, otherwise the forward recognition camera may not recognize lane markers properly.
Do not subject the forward recognition camera to strong impacts.
When the lane departure alert system detects a malfunction, the meter buzzer sounds, the LDA indicator light illuminates in yellow, the warning message appears on the multi-information display, and the lane departure alert system stops operating.
Since this does not affect normal driving, keep driving carefully.
When the engine is stopped and started again and the LDA main switch is turned on, the lane departure alert system can be resumed when the engine is restarted and the lane departure alert system is restored back to normal.
Changing tires or changing suspension parts may lead to a decline in performance of the system.
Depending on road surface conditions, it may be difficult to hear the warning sound.
Do not modify the headlights or attach stickers to the surface of the light.
Do not install or place anything on the hood or the grille. Also, do not install a grille guard (bull bars, kangaroo bar etc.).
If the windshield is fogged up, use the windshield defogger to remove fog from the windshield. When it is cold, using the heater with air blowing to the feet may cause the upper part of the windshield to fog up. This will have a negative effect on the images.
If the windshield needs to be replaced, contact your Lexus dealer.
When the lane departure alert system detects a fault, the meter buzzer sounds and a warning message will appear to alert the driver and the lane departure alert system stops operating. However, normal driving can continue. Contact your Lexus dealer if any error alert is output repeatedly after turning the power switch on (IG) again.
When zero point calibration has not been completed on the steering sensor, the lane departure alert system doesn't work.
Precautions Concerning Road Conditions
If the system cannot recognize lane markers under the following conditions, the system will not operate.
When driving through an area with no lane markers, such as a tollbooth, a crossing or before a ticket checkpoint
When driving on a sharp curve
When the lane markers are extremely narrow or extremely wide
When the vehicle leans to one side an unusual amount due to a heavy load or improper tire inflation pressure
When the following distance between your vehicle and the vehicle ahead is extremely short
When the lane markers are yellow (These may be more difficult for the system to recognize compared to white markers)
When the lane markers are Botts' dots (raised pavement markers), stone or indistinct
When the lane markers are on a curb etc.
When the lane markers are obscured or partially obscured by sand, dirt, etc.
When there are shadows on the road running parallel with the lane markers, or if a shadow covers the lane markers
When driving on a particularly bright road surface, such as concrete
When driving on a road surface that is bright due to reflected light
When driving in a location where the light level changes rapidly, such as the entrance to or exit from a tunnel
When sunlight or the headlights of oncoming vehicles are shining directly into the camera lens
When driving on roads that are branching or merging
When driving on a road surface that is wet due to rain, previous rainfall, standing water, etc.
When the vehicle experiences strong up-and-down motions such as when driving on an extremely rough road or on a seam in the pavement
When headlight brightness at nighttime is reduced due to dirt on the lenses, or when the headlights are misaligned
When driving on winding roads or roads that are uneven
When driving on rough or unpaved roads
If the distance between vehicles is extremely short, lane markers may not be recognized correctly. Maintain an appropriate distance from the vehicle ahead.
When the vehicle is parked during hot weather, the lane departure alert system will not operate for a while after the power switch is turned to on. When the temperature in the cabin reaches the appropriate level at which the forward recognition camera can operate, the lane departure alert system can be resumed.