The purpose of the current paper is to optimize the FIS position in order to prevent airbag from malfunctioning due to inaccuracy of airbag sensibility during frontal and offset vehicle collision at various velocities. In this paper, the frontal and offset crash models using finite elements are firstly constructed for the 12mile frontal versus 25mile offset crash, and 18mile frontal crash versus 40mile offset crash. Then, the parameter design scheme of Taguchi method is used to obtain the robust optimal position of the FIS. As a result, the robust optimal position of the FIS which is installed in the carrier upper member of FEM is suggested considering the noise effect such as the vehicle weight, strength and stiffness of front side member and bumper back beam. Moreover, it is shown that discrimination of crash pulse as regards the various frontal crash modes above mentioned is enhanced dramatically for the air bag deployment. Current paper will contribute in various technologies-minimize cost and the number of real tests for airbag sensing, reducing the target period for regulation and product development, and prevention for PL(Product Liability)-providing solution for uncertainty of airbag activation under various collision situations.