what causes beeping noise on 2000 Audi A4 Quattro

3 beep tones

Asked by for the 2000 Audi A4 Quattro
2 answers
This is somewhat vague. Does it beep when you turn your key to position II or III. Does it beep if you plug your seat belt in?

The only time my car beeps is when I turn the car on and I don't plug my driver side seat belt in.
Under what condition(s)/times does this three beep occur? Do you possibly have an owners manual to reference?