In all newer cars in all brands this thing is inbuilt behind the In dash music player (as a security feature), beeper is nicely hidden to sound like 3D sound. If somehow you reach and disable, Galadhari is right then all sounds and alarm will also be disable, makes no sense.
What you can prolly do is pull the dash unit and reach behind to the beeper and tape it nicely, that might help in reducing noise (my guess).