OUTLINE
The lane departure alert system uses a lane departure warning camera to detect lane markers on the road surface and activates the lane departure warning when needed.
The lane departure alert system also operates on roads with only one lane marker.
The lane departure alert system is controlled by the lane departure warning camera.
This system has a last memory function which memorizes the state of the LDA switch just before the engine switch is turned off and resumes the previous state when the engine switch is turned on again.
PRECAUTION
General Handling Precautions
Use the lane departure alert system with clear lane markers.
The lane departure alert system alerts the driver of unintentional deviation from the lane. It does not aim to assist the steering operation while the driver releases the steering wheel or does not pay attention to the road ahead.
Do not place any objects on the instrument panel. The system may mistakenly recognize an object reflected in the windshield glass as a lane marker.
Keep the windshield glass clean around the area where the lane departure warning camera is mounted. The performance of lane departure warning 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 lane departure warning 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 lane departure warning camera. Since the angle of the lane departure warning camera is precisely adjusted, angle adjustment must be performed after the lane departure warning camera is reinstalled, otherwise the lane departure warning camera may not recognize lane markers properly.
Do not subject the lane departure warning camera to strong impacts.
When the system detects a malfunction the buzzer sounds, the LDA indicator light turns off, "Check LDA System" 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 switch is turned on, the lane departure alert system can be resumed as soon as the system returns to normal.
If the LDA indicator light turns off, even if the LDA switch is turned off and on and the system resumes operation, the system is malfunctioning. Contact a Lexus dealer.
Towing a trailer may lead to a decline in performance of the system.
Changing tires (including changing to studless tires) or changing suspension parts may lead to a decline in performance of the system.
Precautions Concerning Road Conditions
If the system cannot recognize lane markers under the following conditions, the system will not operate.
No lane markers on roads, for example, before tollgates
Unclear lane markers
The road surface reflects the bright sunlight
The road surface is a bright color, for example, concrete roads
Brightness changes suddenly, for example, tunnel entrances or exits
In backlight
Roads where gradient changes, on winding roads or on uneven road surfaces
In bad weather
Ice, snow or water puddles on 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 system will not operate for a while after the engine starts running. When the temperature in the cabin reaches the appropriate level at which the lane departure warning camera can operate, the system can be resumed.
Precautions for Lane Departure Alert System
Keep the vehicle in the lane by turning the steering wheel appropriately and driving carefully.
The lane departure alert system does not prevent lane deviation. It only alerts the driver of lane deviation by displaying a warning message and sounding a buzzer.
When the warning is activated, operate the steering wheel appropriately to guide the vehicle back into the lane.
The warning can be activated while the vehicle is being driven between approximately 50 km/h (31 mph) and 210 km/h (130 mph).
The alarm may be activated early or may not be activated depending on conditions around the vehicle. The driver is required to operate the steering wheel to correct the vehicle path while paying attention to road conditions and traffic.
When there are any strip-shaped patterns, such as shades, ruts or blurred lane markers that are no longer used on the road, the system may mistakenly recognize them as lane markers. Turn the LDA switch off under such road surface conditions.