First of all are you Okay?
Was your airbag replaced according to the warranty program?
The lack of deployment could indicate that your car had been previously crashed and a new airbag wasn't installed. Or the service light has been disabled by someone at some point in time.
Let me know what the root cause was for that to happen. I want to make sure that anyone driving my 07 FX35 is safe.
Thanks for the heads up.