Typical proceedure for A3/A4 (courtesy of /oooo-a3.blogspot.com/),
which i sucessfully used recently:
Click on '17-Instruments'
When you go into this module, it will scan for fault codes and go straight to a fault code screen. It should say 'No Fault Codes Found'. Click the 'Done, go back' button to get to the main screen for this module.
Click 'Recode - 07'
Make note of your original coding.
Hover over the code with the mouse pointer, and it will show a pop-up balloon with information about the various digits of the code.
One of the digits (2nd, counting right-to-left) is for the seat-belt chime configuration. It's originally set at '6' (USA). Changing it to '0' disables it entirely. For example, change 0002463 to 0002403