Codes for the airbag warning light need to be pulled using the airbag
testing tool by your dealer I'm afraid, there is no other way to check
or reset them as far as I'm aware (they survive battery disconnects and
other such tricks).

The usual cause of SRS faults are the sliprings on the steering column
that transfer airbag, horn and other such signals from the fixed column
to the steering wheel.  A momentary break in continuity is enough to
trigger the warning.  I don't think replacing the slip rings requires
major wallet surgery but as the airbag contains a small explosive device
it is best to let the experts do it (although if you Google you will
find instructions on how to do it - have a look on www.saabscene.com for
example).

As this is a safety feature on your car it is best to get it sorted
sooner rather than later.

Cheers,

Andy

Yes it does need diagnostic gear. My daughter's NG 900 had perpetual trouble
with her SRS light (it was always on along with other warning lights!), she
finally gave me the car at 39k miles and I fixed everything except the SRS.
That was done at a dealers 3.5 years ago and hasn't come on again.

Unfortunately no,  Go to a stealer or an indy.  My guess is it is
triggered by a voltage dip.