Collision Avoidance and Parking Assist Systems: Description and Operation
Lane Assist
Lane assist helps the driver keep the vehicle in its lane. If the system is in operation and the vehicle approaches a recognized boundary line and will leave the lane, the driver is notified by a vibration in the steering wheel. If the system is in operation and the turn signal is activated before driving over a recognized boundary, the warning is not given because the system assumes it is an intentional lane change.
The steering wheel is equipped with a vibration motor to create the steering wheel vibration. The vibration motor is encased in foam in the lower left spoke of the steering wheel. The steering wheel vibrations are generated by a rotating weight installed on the motor. It cannot be replaced separately. The entire steering wheel must be replaced if the vibration motor is faulty. The duration of the steering wheel vibration depends on the driver reaction and generally lasts about one second.
The camera detects the space in front of the vehicle using an integrated sensor. The camera uses these images for "lane recognition" and "vehicle detection at night".
In order to detect objects, vehicles with ACC must have an image processing control module (J851). The image files from the camera are then transmitted via the appropriate interface to the image processing control module and processed further.
The image processing control module assigned to the camera processes the image files from the connected camera and transmit the logic results from the image processing control module via the FlexRay bus to the partner control module.
The camera and camera control module (J852) are assembled in one housing. The entire unit must be replaced if the camera or control module is faulty.
The camera control module is installed at the center of the top edge of the windshield at the level of the interior rearview mirror. It is secured in a bracket that is bonded to the windshield.
The image processing control module is located in the front passenger footwell.
Changes that restrict the visual area of the camera (such as applying labels, stone damage) can lead to malfunctions.
To prevent the camera view from icing over, the windshield is heated in this area. The camera controls the windshield heating. Replace the windshield if the windshield electric heating is faulty.
The button for the directional stabilization assistance button (E517) is integrated in the turn signal lever. Pressing the button switches the system on and off.
• The message "Audi lane assist not available: no sensor range at this time" appears if the camera function is no longer available due to ongoing poor visibility of the lane lines. The following could cause this:
• The camera visual field is dirty or icy. If that is the problem, it should be corrected.
• There is condensation on the camera visual field. If this is the case, wait until the condensation disappears.
• Lane lines are not visible for an extended period of time due to road conditions (such as snow on the road surface).
If the condensation does not clear on its own or if there is heavy dirt on the inside of the lens (in the camera visual field), the camera visual field must be cleaned by hand. To do this, remove the control module and the lens screen and clean the front window using cleaning solution. Refer to => [ Camera Control Module (J852) and Lens Trim ] Camera Control Module (J852) and Lens Trim.
The calibration must be correct for proper lane assist function.
Calibration is Necessary if:
• "No or incorrect basic setting/adaptation" is stored actively in the Diagnostic Trouble Code (DTC) memory.
• The camera control module was removed and installed again or replaced,
• The windshield is replaced or removed,
• The rear axle toe was adjusted,
• The vehicle suspension was changed, for example, changing from standard to sport suspension,
• The control position on vehicles with air suspension was reprogrammed.
• Before calibrating the lane assist, check the DTC memory and correct any faults. To calibrate the lane assist, the vehicle driving direction must be specified and serves as the reference position for the setting device (VAS 6430). The lane assist must only be calibrated using alignment equipment approved by VW/Audi. Only use the (VAS 6430) to calibrate the lane assist.