2000 lumina beeping noise

Can anyone tell me whats the beeping noise under the dash while driving down the road it comes on by itself every here and there, I hope that someone can help. Thanks

seat belt warning?

open door warning? does it come on after going over a bump? does the dome light come on? any dash lights come on with that sound?

No it just comes on when your driving on smooth roads like its coming under the dash or under the stereo console in the center.

Any wiring done to your stereo lately? mine does 3 double beeps when i turn the key off. I had a short behind my stereo before i put new speakers in and it beeped now and then while i was driving. Im willing to bet its a wiring issue somewhere.