If the indicator lamp in the button lights up and the multifunction display shows the symbol in the status area, Lane Keeping Assist is activated but not ready for use.
If you are driving with Lane Keeping Assist activated at speeds above 60 km/h and lane markings are detected, the multifunction display shows the symbol highlighted in the status area. Lane Keeping Assist is then ready for use.
The status overview in the Assistance menu also displays the status of Lane Keeping Assist More.