Gargoyle
If you read your manual,it says there how to correct that problem:Look back at your rear seats,you will see two tabs coming out of the butt cushions,one on each side,pull them out and you will be able to lift the cushion,on the side of the rear armrest there is a hole,you have to insert there an allen wrench,I do not remember the size but it cones with your car in the center console,and turn clockwise for at least one turn,test it first what is needed,and your seat belt will be fixed.