Seat belt I got trap in my seat belt yesterday I had to crawl out of it what can I do?

Most of these systems are usually reliable so start by checking the obvious stuff first. Go over the entire seat and assembly. Look and carefully feel around the front, back, both sides, top and underneath. Look for anything trapped in or under the seat and mechanism blocking the action of the stow system. (Kid's stuff, shopping bags, candy wrappers and loose items from the trunk). Next check any safety belts. Sometimes the strap or buckle gets trapped somewhere on the seat acting like a wedge or hook.

This door jamb problem happened to my car! The metal seat belt hasp was jammed in the door and this prevented the door fro fully fitting in its door frame. The slight misalignment created a stress on the door lock as it grabs the door jamb u shape. Crawl in the passenger side and look to see if the seat belt is jamming door. Use your strength to pull the seat belt hasp out of the frame.

Some seat backs, you can get ahold of the bottom and jerk up, to remove. It that doesn't work, it may be bolted. If the seat back is bolted, you may have to remove seat bottom.
Even with seat back removed, you may not be able to crawl into trunk, but, if you can see your keys, use a stiff piece of wire and hook your keys to pull keys out of trunk area.

Their no magic words to say you have to crawl under the seat look at the bolts holding it to the floor along with seat belts if required and remove the bolts .
Then it will come out .

You may have to replace the female receptical for the seat belt. There may be a switch inside the latch that has gone bad.

The interior fuse box in a Pontiac Bonneville is underneath the backseat on the driver's side.

To remove the rear seat cushion:
1. Pull up on the front of the cushion to release the
front hooks.
2. Pull the cushion up and out toward the front of
the vehicle.

To reinstall the rear seat cushion:

1. Buckle the center passenger position safety belt, then
route the safety belts through the proper slots in the
seat cushion. Don't let the safety belts get twisted.
2. Slide the rear of the cushion up and under the
seatback so the rear - locating guides hook into the
wire loops on the back frame.
3. With the seat cushion lowered, push rearward and
then press down on the seat cushion until the spring
locks on both ends engage.
4. Check to make sure the safety belts are properly
routed and that no portion of any safety belt is
trapped under the seat. Also make sure the seat
cushion is secured.

Notice:
The battery and main fuse blocks are located
under the rear seat cushion. The battery's ground
terminal and some relay wires are exposed.
To help avoid damage to the battery and wires,
be careful when removing or reinstalling the seat
cushion. Do not remove covers from covered
parts. Do not store anything under the seat, as
objects could touch exposed wires and cause
a short.

It maybe a coin or something trapped in the seat rail or pull cord snapped or stuck if manual, if electric then have you checked plug to motor or fuse???

Have to remove the panel and have a look at the lock mechanism ,about 50 /60 euros for the part but only available from the fiat dealer .its a complete unit and i think but not sure its the nylon gear wheel that operates the lock ,at least you have a emergency cable ,i was on my belly crawling through the back seat doing a renault clio yesterday

have the seat belt replaced. or find out if there's any foreign object in the latch.

For starters check for any recalls.