2016 Nissan Armada AIR BAGS,SEAT BELTS,SERVICE BRAKES

A FEW DAYS AGO I WAS DRIVING MY NISSAN ARMADA AND NOTICED A LIGHT ON THE DASH. GOOGLE IT AND SAYS THAT THE AIRBAGS/SEATBELTS ARE NOT WORKING PROPERLY. THE LIGHT JUST CAME ON AND OFF AND SOME TIMES NOTHING HAPPENED BUT SOMETIMES THE LIGHTS COME ON JUST FOR NO REASON LIKE AFTER STOPPING AT THE GAS STATION OR EARLY IN THE MORNING. AND ANOTHER DAY THE BREAK JUST STOP WORKING AND I HAVE TO PUMP IT UP TO GET IT BACK TO WORK EVEN THOUGH I HAVE NEW BREAK PADS ON IT.SO AT RHIS POINT IM JUST TRYING TO SELL IT ALTHOUGH THE ENGINE WORKS FINE, IM SCARED THE BAGS MAY EXPLODE ON ME OR HIT SOMEONE BECAUSE THE BRAKES DON'T WORK.