Thanks, that issue is gone now.
Do you have any idea about why the guidelines are not displayed?
That's very helpful, thank you. Then I will try to set them to not installed.AHK = Anhängerkupplung = towbar
Most likely ARA is Anhängerassistenten (EN: Trailer Towing Assistant = TTA)
ARA mechanical = dedicated articulation angle sensor in tow ball?
ARA optical = optical trailer assist?
Also found this: