1. A method for characterizing piezoelectric sensor signal responses for automotive vehicle crash analysis, said method comprising: providing at least one piezoelectric sensor mounted at a predetermined locations on the automotive vehicle; sampling a response from the piezoelectric sensor for a predetermined period of time; subjecting the response from the piezoelectric sensor to a wavelet analysis and obtaining signal amplitudes; plotting the signal amplitudes in three-dimensional space and forming a cluster of signal amplitudes; comparing a most recent cluster to reference clusters that are indicative of both crash and non-crash events; and providing instructions to an occupant restraint control system in the automotive vehicle.