I finally got my MultiECUScan tool adaptor cables and using the Red cable on the diagnostic port, was able to reset the Airbag Trouble Code (DTC). The actual source of the DTC was the Pre-tensioner on the drivers seat. It was simply dirty, from 25 years of neglect i suppose. Removing the yellow seat connector near the buckle, under the black rubber cover, and spraying both sides with contact cleaner was all that was needed.