I have just fixed this in my 2002/3 Berlingo.
The problem happens because the seat belt retracts too far when the seat is folded. It's necessary to unbolt the seat in some way to give extra slack while at the same time having the rear part of the seat upright. This will allow the inertia reel to unlock and give out belt again. I was lucky - my seat still went into the upright position, and so I was able to get enough slack without unbolting the entire seat, as follows:
1: Make sure the belt can't retract any further, by wrapping it around something (if possible) or putting some kind of clip on it.
2: Fold up the single seat, so it's out of the way.
3: Remove the plastic covers at the sides of the seat where the two parts join. (NB Not all the screws are the same - keep track!) These cover two T-50 bolts that form the hingle of the upper and lower parts of the seat.
4: Undo the two T-50 bolts. NB these two bolts are different. Keep track!
5. With the lower part of the seat in the normal position (i.e. horizontal), move the now loose upper part of the seat back and down (and a little bit sideways) so that it is not sitting just behind the lower part of the seat, and is vertical.
6: Carefully, with the slack that has now been created, allow a small amount of seat belt back into the vertical seat back, to unlock the intertial reel. You should now be able to draw out the seat belt.
7. Carefully wrapping the excess around a headrest, to make sure it doesn't all get drawn back in again, re-assemble the seat.
NB I also unhooked the string/plastic combo that lifts the seat latches when the back of the seat is folded. I don't think this was actually necessary, but I might be mistaken.
It's a bit fiddly, and I found the T-50s very stiff, but not too bad all in all. Best of luck to anyone with this problem.
Edited by pdurrant on 26/01/2013 at 10:13
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