Trailer Hitch Registration with VAG-COM (Div. Steuergeräte)

Hello everyone, I'm looking for a German instruction manual to inform the vehicle's control unit that a trailer hitch has been installed. The vehicle is a VW Touran, manufactured in 2005. Perhaps someone here can help me? Thanks in advance. Best regards, Klemmi.

Hello Klemmi,

It would certainly be interesting to know what kind of auxiliary heating system (AHK) or control units were added, and how everything was connected.

Best regards, Rainer.

Sorry, I was constantly under pressure, but now: The agricultural hitch is not yet installed. It's a Westfalia coupling 321 537 with a Westfalia electric kit 312 600 300 113. Under the sticker on the control unit that Westfalia supplied, I can see a VW sticker with the following VW number: 1KO 907 383. Unfortunately, I don't have any more information. Hopefully, this is enough.
MFG Jürgen

Edit: Solutions
Ich kann den Text nicht übersetzen, da ich keinen Text erhalten habe. Bitte gib mir den Text, den du übersetzt haben möchtest.
Okay, I'm ready. Please provide the German text you want me to translate.