most cars that have a rear childproof locks can be controlled on the drivers panel locking them til changed.you might want to check this out. Saab switches and door panels remove easily following steps in repair manual. You can check the different parts and find the problem.
The wire (or whatever) that connects the door handles to the latch may be broken or slipped off the track or otherwise damaged. You'd have to take the inside part of the door off and see if you can manually trip the latch or fix the wire.
Assuming it is the same as my '91 9000, then you can remove the inside door liner/skin/card whatever its called with the door shut. Once the internals of the door are accessible, you can reach in to the lock & open it manually.
I had a similar problem. It turned out I had 2 issues - one of the link rods had seemingly stretched over the years, and did not manage to trip the lock any more, but also on inspection of the lock itself the on/off for the childlock was worn and no longer working. ISTR fabricating something involving a small nut & bolt, but it was a while back!
Anyway, strip the inside of the door off, pull the rods, and if necessary remove the lock mechanism. Take it from there - it is relatively simple once you can see things clearly!
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