03 Aurora - air bag problem - EXP 1

The DIC suddenly displayed air bag problem - EXP 1 when I started the car yesterday. Now, every time I start it, the DIC displays the same air bag problem message and the air bag light comes on in the dash! Has anybody experienced this and know of a quick & inexpensive fix? I tried my cheap little scan tool on it, but it didn't show me any codes and I checked the fuse.
Thanks