According to Sebastian's excellent openobd website there are 7 options for seat belt warnings on B7's:
0 = none
1 = Europe driver only, permanent light, beep for 91 seconds
2 = old US/Canada driver only, 6 second light and beep
3 = NAR US/Canada driver only, permanent light, beep every 30 seconds
4 = Europe driver & front passenger, permanent light, beep for 91 seconds
5 = old US/Canada driver & front passenger, 6 second light & beep
6 = NAR US/Canada driver & front passenger, permanent light, beep every 30 seconds
What coding have you got (it's the penultimate digit xxx?x in the coding of module 17)? And what actually happens?
My 2006 RS4 (UK) is coded 1, but I don't get any beep at all just the permanent light. I'd like to re-code it to 4 or 6, but would like some feedback first.