My air bag light is on in a 2004 impala. I hooked a scanner up to it and the code b0077 driver sis malfuction. Any ideas on what would cause this?

This is a complex system to diagnose you need the full wiring diagram and diagnostic charts for these codes, there are also special load checking tools. This may still be under the warranty also. I can tell you this 1st hand as I just correctd a similar problem in my GM truck. This refers to the l/s impact sensor or wiring.