Impact Sensor: Description and Operation

INFLATABLE RESTRAINT SIDE IMPACT SENSOR (SIS)
The inflatable restraint Side Impact Sensor (SIS) is crash-sensing device used in the detection of side impact collisions. The SIS is located in the LH B pillar. The inflatable restraint side impact sensor 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.
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.