There is a small plastic lever inside the lock mechanism that's broken.
This requires replacement of the lock assembly, which is fairly easy.
Or if you're a real animal, try to fix it.
http://wwww.volvospeed.com/Repair/v70latch1.php
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Mike F.
Thornhill (near Toronto), Ont.
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)