PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL
Note
When disconnecting the cable from the negative (-) auxiliary battery terminal, initialize the some systems after the cable is reconnected.
If the auxiliary battery has been discharged and charged or the cable has been disconnected and reconnected to the negative (-) auxiliary battery terminal, perform Steering Sensor Zero Point Calibration.
HANDLING PRECAUTION FOR LANE CONTROL SYSTEM
Keep in mind the following points when inspecting the lane control system.
Lane control system provides information and steering assistance in accordance with the road and driving conditions. However, the system alone is not sufficient for maintaining the vehicle position in the lane. Be sure to control the vehicle using the steering wheel to correct the vehicle's path while paying attention to your surroundings and the road ahead. Drive the vehicle in a responsible manner under all circumstances.
The lane control system operates when it recognizes lane markers using the object recognition camera mounted on the upper portion of the windshield. Therefore, the system does not operate when lane markers are not detected. Additionally, a light amount of steering assist force that will not interfere with driving may be applied or a warning buzzer may sound unnecessarily. Be sure to control the vehicle using the steering wheel in a responsible manner under all circumstances even when the system is operating.
The lane-keeping assist function of the lane control system makes it possible to track the preceding vehicle when it becomes difficult to detect the lane, such as in a traffic jam. In this case, take care when the preceding vehicle changes lane or leaves an IC exit as the vehicle may deviate from the lane in order to follow the tracked vehicle.
The lane-keeping assist function, lane change assist function and curve speed reduction functions of the lane control system are intended to be used on expressways and roads for use by vehicles. Do not use these functions on normal roads.
The lane control system recognizes the condition around the vehicle using the camera and radar installed to the vehicle and supports lane change operations. In some cases, it may not be possible to correctly recognize surrounding the vehicle depending on the road and surrounding environment. Therefore, always change lanes according to the condition of the road and its surroundings.
The lane control system operates when the LTA main switch is turned on and lane markers are detected while the vehicle is traveling within the system operating speed. However, depending on the road and driving conditions, the system may not operate or operation may be canceled.
Under the following conditions, the lane change assist function may not operate, may operate incorrectly or performance may not be sufficient. In these cases, always make sure to check surrounding area just like in normal driving, and change lanes manually.
The lane control system detects a vehicle nearby
The lane control system cannot detect the lane
Driving on a road other than those used for vehicles (excluding some roads)
Driving at a speed higher than the operating speed
Driving around a sharp curve
While merging or driving in a merging lane
No hands are detected on the steering wheel while driving
Turn signal operation is continued for a certain period of time while the lane change support cannot be operated
Under the following conditions, the curve speed reduction function may not operate, may operate incorrectly or performance may not be sufficient. The driver must drive responsibly while checking the surrounding traffic condition and not rely heavily on the function.
The estimated location of the user's vehicle on the navigation differs largely from the actual position due to poor GPS reception, poor weather, etc.
Driving beneath the target road used for vehicles (overhead road)
The shape of the road and map information do not match due to road work, etc.
Driving on a road other than those used for vehicles (excluding some roads)
Driving around a slight curve near a straight road
The user's vehicle is driving at vehicle speed higher than the legal limit
The lane control system may not operate in any of the following conditions:
When driving through an area with no lane markers or such as a tollbooth
When lane markers are obscured or cannot be recognized due to backlight, bad weather or standing water
When driving in a location where the light level changes rapidly, such as the entrance to or exit from a tunnel
When the tires are excessively worn or the tire inflation pressure is insufficient
When non-standard tires are used (incorrect tire size or tire maker)
When winter tires or a spare tire is used
When a non-standard suspension is installed
When the road is partially covered in snow.
When there are shadows on the road running parallel with the lane markers
When the lane markers are Bott's dots (raised pavement markers), stone, etc.
When there are markings on the road due to road repairs, etc.
When driving through a road construction area
When turning a sharp corner
When driving on a road that is branching or merging
When a lane is extremely narrow or wide
When driving on a particularly bright road surface, such as concrete
When driving on a road surface that is bright due to reflected sunlight or the headlights of oncoming vehicles
When driving on a road surface that is wet due to rain, standing water, etc.
When driving on a winding or uneven road
When the distance between the vehicle and the preceding vehicle is extremely short
When the vehicle experiences strong up-and-down motion such as when driving over a joint in the road surface or on an extremely rough road
In the following conditions, the detection performance of the steering touch sensor may decrease or not detect at all.
When a cover is installed to the steering wheel assembly.
When the user is wearing gloves.
When foreign matter is stuck on the steering wheel.
When the user touches an area that does not contain a sensor line, such as the wood areas, leather seam, spoke parts, etc.
In the following conditions, the steering touch sensor may make incorrect detections.
When an object is touching the steering wheel.
When a broad object or arm is close by the steering wheel.
HANDLING PRECAUTIONS FOR AIRBAG SYSTEM
The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.
TROUBLESHOOTING PRECAUTIONS
If a terminal contact point malfunction or part installation problem occurs, removal and reinstallation of the suspected part may return the system to normal. However, be aware that the normal condition may only be temporary.
Before disconnecting connectors or removing/installing parts, determine the malfunctioning area by checking and writing down the vehicle condition at the time the malfunction occurred (DTC outputs etc.).
Be sure to check for DTCs related to other systems. The lane control system may be influenced by malfunctions in other systems.
HANDLING PRECAUTIONS
When removing and installing ECUs, sensors, switches or other lane control system related parts, perform the following:
Make sure that the power switch is off unless otherwise specified in the inspection procedure.
After removal/installation, check for DTCs and confirm that a normal system code is output.
REPLACEMENT PRECAUTIONS
DRIVING SUPPORT ECU ASSEMBLY:
When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
MILLIMETER WAVE RADAR SENSOR ASSEMBLY:
When replacing the millimeter wave radar sensor assembly, always replace it with a new one. When a new millimeter wave radar sensor assembly is installed to the vehicle, it receives vehicle information from the driving support ECU assembly and stores it. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly and millimeter wave radar sensor assembly will not match and a DTC may be stored.
When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.
OBJECT RECOGNITION CAMERA:
If the object recognition camera has been replaced with a new one or the windshield glass has been removed and installed, it is necessary to perform Object Recognition Camera Learning.
When replacing the object recognition camera, replace it with a new one. If a object recognition camera which was installed to another vehicle is used, the information stored in the object recognition camera will not match the information from the vehicle and a DTC may be stored.
When replacing the object recognition camera, do not damage the camera lens or allow it to become contaminated with foreign matter.
Do not reuse a object recognition camera that has been dropped or subjected to a strong impact.
WINDSHIELD GLASS:
When replacing the windshield glass of a vehicle equipped with a object recognition camera, make sure to use a Lexus genuine part. If a non-Lexus genuine part is used, the object recognition camera may not be able to be installed due to a missing bracket or the lane control system may not operate properly due to a difference in the transmissivity or black ceramic border.
Do not attach stickers, including transparent stickers, or other items to the outer side of the windshield glass assembly within the area in front of the object recognition camera.
STEERING WHEEL ASSEMBLY:
When replacing the steering wheel assembly of a vehicle with a lane control system, make sure to use a Lexus genuine steering wheel assembly with a lane control system.