2011 Nissan Frontier

My air bag light kept flashing on my 2011 Nissan Frontier Pro 4x4, I had it looked at when I got my oil changed and was told that it is a malfunction where you click the seat belt into, the light is off now but once some one sets in the passenger side seat and puts the seat belt on the light will come back on, due to malfunction in the seat belt, and if I would get into a accident and some one is sitting in the passenger side the seat belt will not properly secure them

I HAVE REPEATEDLY GOTTEN INDICATORS (VIA VEHICLE'S COMPUTER) OF AIR BAG FAILURE, ON A VEHICLE OF LOW MILEAGE, WHICH HAS NEVER BEEN IN AN ACCIDENT, AND HAS GOTTEN FAILURES REGARDING THE FRONT PASSENGER SEAT, WHICH IS RARELY USED. THE FIRST TIME, THE DEALER REPLACED THE SEATBACK AND AIRBAG UNDER WARRANTY. THE SECOND TIME THE DEALER REPLACED THE SEATBELT ASSEMBLY. HOW, THE 3RD TIME, THEY TELL ME THAT THE SAME SEAT - CUSHION NEEDS TO BE REPLACED, ALONG WITH THE AIRBAG, AND THAT I HAVE TO PAY OVER $2,000 FOR THIS. EACH TIME I GET THIS FAILURE NOTIFICATION, MY AIRBAG IS DISABLED. SO, IT IS AN ONGOING ISSUE. THE AIR BAG FAILURE LIGHT KEEPS COMING ON RANDOMLY, NOT RELATED TO A DRIVING INCIDENT.

SIDE AIRBAGS DEPLOYED WHILE MY WIFE WAS DRIVING ON A SMOOTH COUNTY ROAD WITHOUT A COLLISION AT APPROXIMATELY 20 MPH. DRIVER ONLY IN THE VEHICLE, EARS ARE RINGING. HAD TO CUT THE AIR BAGS TO BE ABLE TO DRIVE THE VEHICLE HOME. IN DRIVE WAY, UNUSABLE AT THIS POINT. SEAT BELT RETRACTORS ACTIVATED SO CANNOT USE SEATBELT AT THIS POINT.