I doubt you can disable safety features , but you could probably activate the chime to test it's ability to be able to drive someone nuts driving with a seatbelt unbuckled or door ajar. Lay off the Steak Burritos, and buy a fat man seat belt extender , so it's easier to reach the buckle, LOL
http://www.seatbeltextenderpros.com/mercedes-benz-seat-belt-extensions/?gclid=Cj0KEQiA9P7FBRCtoO33_LGUtPQBEiQAU_tBgN_cb72OYUQw1YU6Op8ojxNaLJIVmZu_Y5FwfdoreIkaAvJL8P8HAQ