It's unclear to me why your indie was not able to read control module codes.
The Porsche 986 diagnostic manual identifies many air bag codes some of which are specific to the module itself. This implies that something can read air bag module codes. Perhaps with Porsche, only the PIWIS can read them. Perhaps other diagnostic computers can read the codes and your independent's cannot.
It would be nice to know because as Mike's note indicates many things can cause the air bag to light to light including grounding issues.
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