What do you mean by the "closed position"?
The bolt is in the closed (forward) position when the weapon fires, as opposed to an open bolt, in which the bolt is in the open (rearward) position when the weapon fires. Rifles are typically closed bolt weapons, whereas belt fed machine guns usually fire from the open bolt (one exception to this is the belt fed machine guns based on the HK91/93 platform, such as the HK11 and HK21).
Take it to the trim shop. It probably will need replaced.
Yes. If you have automatic seat belts be sure to your lap belt.
That I know of, there is NO serpentine belt, unless you are talking about the the Timing Belt (hardly serpentine, but anyway), it has a belt tensioner, not automatic, though.
If your vehicle has an automatic belt tensioner with a serpentine belt, the belt is worn and needs to be replaced. On older models, the belt tension can be set by adjusting it at the alternator bracket. Loosen but do not remove the two bolts that hold the alternator in place (one at the bracket and one on the block) and pull the alternator to tighten the belt. Hold in position while re-tightening the bracket bolt then tighten the bolt on the block.
An automatic rifle is a rifle which loads itself from a belt or magazine.
Away from the serpentine belt
If it has a serpentine belt - should be automatic through the belt tensioner
with the automatic belt tensioner..
It has a timing belt.
Show me a diagram for a belt on a John Deere 125 automatic
Usually it is a short in the electrical system. You may want to check all your fuses too. But most likely it is because the motor for the seat belt went out. Automatic seat belts won't go into position unless they think the door is closed. Plus the door chime won't stop unless the car thinks the doors are closed. Try spraying WD-40 in all door latches. It worked for us!