Impact Sensor: Description and Operation

SIDE IMPACT SENSOR (SIS)

The SIS is a crash-sensing device used to detect side impact collisions. An SIS is located in the left and right B-pillars. The SIS connects to the SIR wiring harness using a 2-way connector. The SIS receives power from the SDM when the ignition is On. The SIS is used to perform the following functions:
^ Side Impact Crash Detection: The SIS monitors vehicle velocity changes to detect side impact crashes that are severe enough to warrant deployment.
^ Side Air Bag System Status Communication: The SDM monitors the SIS through two interface circuits. The SIS can communicate the status of the side impact air bag system to the SDM.