I think you are stuck
At least this time around it was Onstar and bluetooth/XM, imagine some people's surprise to find no side airbag in their used fleet Impala!
http://cnettv.cnet.com/chevy-impala-missing-airbags/9742-1_53-50084068.html
http://cnettv.cnet.com/chevy-impala-missing-airbags/9742-1_53-50084068.html