Well, there's a couple ways you can tackle this... Listen to where the beeping is coming from, usually you can locate the "beeper" and unplug it without affecting other circuits. I have done this on my Ford. Another way you can tackle this is to look for the electrical connector by where your seat belt plugs in and unplug that. These are usually under the seat. Sometimes they're under the carpet under the seat. Another thing you may consider... if you find the "beeper" try putting tape over the speaker holes to lower the volume on it. Or, taping foam padding around it if possible.
If this helps, please ACCEPT. In not, send me a reply and I will help you further.