Sorry, the NHTSA has not posted this TSB document yet.
You can still get the detailed info from Cadillac for this TSB. Call your local Cadillac dealer's service department & ask for a copy of TSB# PIC-4871A.
GMC: SERVICE AIR BAG; SIR INDICATOR ON (DTC B0012, B0013, B0019, B0020). THE SIR INDICATOR IS ON AND THE DRIVER INFORMATION CENTER (DIC) DISPLAYS SERVICE AIR BAG. *PE