I have had exactly the same issues... battery three times, passenger seat module causing airbag not to work, compressor bad... GM dealer states seat and compressor are out of warranty and they want 2k to fix both.
I just had my second hybrid battery replaced - my drivers side heated seat stopped working last year and now the passenger side stopped working along with the airbag. I spoke with a women in parking lot with a n 07 Hybrid - she is on her third battery - every 30K - and her passenger seat module was just repaired as well. Oh - and the AC compressor went last year. I think they have a problem