LEXUS Safety System+ Front Camera Optical Axis Learning Information (L-SB-0121-17)
Publication date: 2017-04-10Reference number: L-SB-0121-17
LEXUS SAFETY SYSTEM+ FRONT CAMERA OPTICAL AXIS LEARNING INFORMATION
TECHNICAL SERVICE BULLETIN
| LEXUS: | 2016 - 2017 ES300H, ES350, GS F, GS200T, GS350, GS450H, LX570, RX350, RX450H |
| SERVICE CATEGORY: | Vehicle Interior |
| SECTION: | Pre-Collision Safety |
| COPYRIGHT: | © 2018 Lexus, a division of Toyota Motor Sales, USA License Agreement TMS1002 |
APPLICABILITY
| YEAR(S) | MODEL(S) | ADDITIONAL INFORMATION |
|---|---|---|
| 2016 - 2017 | ES300H, ES350, GS F, GS200T, GS350, GS450H, LX570, RX350, RX450H |
INTRODUCTION
This Service Bulletin includes precautions and key points for the Lexus Safety System+ front camera adjustment/learning procedures.
Situations in which front camera optical axis learning is necessary:
- The front camera has been replaced.
- The windshield glass has been replaced or removed and installed.
- When the following DTC is output:
Lexus Safety System+:
- C1AA9: Front Camera Module Beam Axis NOT Adjusting.
WARRANTY INFORMATION
| OP CODE | DESCRIPTION | TIME | OFP | T1 | T2 |
|---|---|---|---|---|---|
| N/A | Not Applicable to Warranty | - | - | - | - |
ADJUSTMENT PROCEDURE
Refer to the Technical Information System (TIS), applicable model and model year Repair Manual for the adjustment procedure:
- 2016 - 2017 ES 300h:
Engine/Hybrid System - Cruise Control - "Cruise Control: Front Camera: Adjustment"
- 2016 - 2017 ES 350:
Engine/Hybrid System - Cruise Control - "Cruise Control: Front Camera: Adjustment"
- 2016 - 2017, GS F:
Engine/Hybrid System - Cruise Control - "Cruise Control: Front Camera: Adjustment"
- 2016 - 2017 GS 200t:
Engine/Hybrid System - Cruise Control - "Cruise Control: Front Camera: Adjustment"
- 2016 - 2017 GS 350:
Engine/Hybrid System - Cruise Control - "Cruise Control: Front Camera: Adjustment"
- 2016 - 2017 GS 450h:
Engine/Hybrid System - Cruise Control - "Cruise Control: Front Camera: Adjustment"
- 2016 - 2017 LX 570:
Engine/Hybrid System - Cruise Control - "Cruise Control: Front Camera: Adjustment"
- 2016 - 2017 RX 350:
Engine/Hybrid System - Cruise Control - "Cruise Control: Front Camera: Adjustment"
- 2016 - 2017 RX 450h:
Engine/Hybrid System - Cruise Control - "Cruise Control: Front Camera: Adjustment"
PURPOSE OF FRONT CAMERA OPTICAL AXIS LEARNING
If the installation position or orientation of the front camera is changed due to it being replaced with a NEW camera, or the windshield glass sub-assembly being replaced or removed and installed, it is necessary to perform front camera optical axis learning for the front camera to learn the driving direction of the vehicle and its horizontal axis in order for each driving support system (Pre-Collision System [PCS], Lane Departure Alert [LDA], and Automatic High Beams [AHB], etc.) to operate correctly.
CHARACTERISTICS OF THE FRONT CAMERA
- How the front camera recognizes a target:
The front camera operates through recognition of differences in contrast. A high contrast checkered flag pattern target is used when performing learning.
- How differences in contrast are recognized by the front camera:
- What the front camera recognizes as high contrast is NOT limited to what appears as black and white to the human eye.
- Depending on how light strikes the target used for learning, the white part of the target may look dark to the front camera and the contrast will be detected as low.
- If there are overhead lights, windows, reflective objects, or high contrast objects behind the target, the contrast will be detected as high.
HINTS FOR PERFORMING OPTICAL AXIS LEARNING
- Condition required to detect targets appropriately.
The target is placed in an area where the black and white parts of the target can be detected by the camera as being in high contrast.
- Conditions under which the target cannot be detected.
- Light shining from behind the target (backlit).
As the target will appear dark to the camera if the target is backlit, the contrast of the black and white parts of the target will decrease and the target may NOT be recognized.
- Target partially illuminated by light from windows.
If the surface of the target is unevenly illuminated, the contrast of the black and white parts of the target will decrease and the target may NOT be recognized.
- Entire target is NOT illuminated.
If the target is placed in an area that is dark, the contrast between the target and the background will decrease and the target may NOT be recognized.
- Reflective object on target surface.
If an object such as clear adhesive tape is attached to the target surface, or if the target is laminated, the target surface will reflect light. As the reflected light will appear white to the camera, the target may NOT be recognized.
- Border of black and white parts of the target are blurry or distorted.
If the borders of the black and white parts of the target appear blurry to the camera, the detected contrast will be low and the target may NOT be recognized. Also, if the borders are distorted, the target may NOT be recognized.
- Light shining from behind the target (backlit).
- Condition required to complete optical axis learning.
The front camera MUST detect 3 targets in a line.
- Conditions under which optical axis learning cannot be completed.
Target misrecognition due to high contrast object in background.
- If there are lights or reflective or shiny objects in front of the vehicle, they may appear white to the camera and be recognized as a target, as their contrast will be higher than the actual target.
- If something other than the printed target is recognized as a target, the learned target position will be incorrect. In this case, optical axis learning will NOT be completed as the detected targets will have NOT been aligned.
- Examples of areas where optical axis learning would fail.
HOW TO PREVENT A BACKGROUND OBJECT FROM BEING RECOGNIZED AS A TARGET
90% of reported optical axis learning failures were due to an object in the background being misrecognized as a target, resulting in the 3 targets NOT being recognized as aligned. Refer to the following countermeasures to prevent this:
- Block the area behind the target.
By blocking objects behind the target which may be misrecognized as a target, the front camera can more easily recognize the target and complete optical axis learning. In order to do so, block the area behind the target from the view of the camera.
- Use a plain light colored object to block the area behind the target.
Make sure the object is free of wrinkles, fold lines and is non-reflective. A board or piece of cardboard or cloth would be an appropriate object. Target recognition is easier to perform if the object is made of a light colored material.
NOTE: Wrinkles or fold lines in the object may create shadows, leading to differences in contrast in the image processed by the front camera. If an object with pattern is used, depending on the color, the differences in contrast of the pattern may be misrecognized as a target. - Prepare a blocking object with the following amount of blank space in order to prevent a hand or masking tape (which is used to hold the blocking object) from entering the detection area of the front camera. As the distance between the target and blocking object increases, the area necessary to be blocked increases.NOTE: The area shown is the area to be blocked if the blocking object is placed immediately behind the target.
- Precautions for blocking the background.