The seatbelt warning only sounds for a few seconds then goes silent and never sounds again. this occurs at engine start, and also if i unbuckle the belt while moving. this happens to the driver and passenger belts. i took the car to the dealership where i purchased it, they had it overnight and the next day told me that this is the way is was designed. i called volvo usa customer support and was told to take it to a dealer, and then began telling me that his volvo ( unknown model or year) did not do this. the car has 1,300 miles.