How do you disarm alarm in a vw beetle 1999?

To disarm the alarm in a 1999 VW Beetle, insert the key into the driver's side door lock and turn it to the unlock position. This should deactivate the alarm system. If the alarm continues to sound, you can also try starting the engine with the key, which may reset the system. If issues persist, consult the owner's manual or a professional for assistance.