I replaced my 2004 Mini Cooper seats with 2006 seats.I disconnected the battery before I replaced them.Installed the new seats reconnected the battery started the car the airbag went out but came back on after a few seconds.All the connections are tight.Any ideas what is causing this?

Still need to reset airbag light. Due to detecting different type of airbag. You can get a c310 code reader from Amazon to reset. Or you can install inpa on a laptop an also reset.