Inflatable Restraint Side Impact Sensor (SIS)

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

The SIS's are crash-sensing devices used in the detection of side impact collisions. The SIS - Left is located in the LH B-pillar. The SIS - Right is located in the RH B-pillar. The SIS's are used to perform the following functions:

Side Impact Crash Detection - Each 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 a diagnostic line from each SIS. Both SIS's communicate the status of the side impact air bag system to the SDM over these diagnostic lines.

The SIS connects to the air bag wiring harness using a 4-way connector.

The SIS receives power via the SDM whenever the ignition switch is in the ON position.