VELOSTER(FS) >2013 > G 1.6 T-GDI > Restraint (Advanced)  > SRSCM > Side Impact Sensor (SIS)>Description and Operation  
Side Impact Sensor (SIS) system consists of two P-SIS which are installed at each center of the front door module (LH and RH) and two SIS which are installed at each center pillar nearby (LH and RH).
Side Pressure Sensor is also called P-SIS because it detects pressure due to collision at its mounting location.
Side Impact Sensor is also called A-SIS because it detects acceleration.
SRSCM decides deployment of the airbag and the time of deployment through the collision signal of the SIS when the collision occurred.