If you do a controller scan for your car, you can see a list of what's available for your particular model. VCDS shows everything once you go into "Select", but that doesn't necessarily mean it exists for your car. For example, my 2014 Jetta TDI doesn't have the Comfort / Convenience controller (shows "no response to controller").
Instead, it has under Electronics 1, something called 09 Cent. Elect. Within that, under the Advanced Functions group on the right, there is something called Adaptation - 10. Keep drilling down, the next menu that comes up has at the very top a pull down list, whose default is "Documented adaptation channels can be selected here."
This is where the change is made. I picked "Central locking: Audible Locking Confirmation." from the pull down list. The screen that then pops up also has a path shown, "VCDS Release 14.10.0:09-Cent. Elect., Adaptation" and the Channel you would be on would be channel 11. 09:10:11 is the address, in other words.
Like most things computer, it's a zero to turn off, and a one to turn on. If you hover over "New value" field, a balloon will pop up that will tell you for sure what zero or one means for the particular address. Anyway, I set it at zero, saved it, came back out, and now no more obnoxious horn whenever I shut it off. (I also shut off the light show that is also a default; personal preference!). But you need to look at the original scan to get an idea how it is set up for your particular car; probably not the same as my 2014 TDI.
