Suburban 1/2 Ton 2WD V8-5.3L VIN T (2004)
Impact Sensor: Description and Operation
Side Impact Sensors (SIS)
INFLATABLE RESTRAINT SIDE IMPACT SENSORS (SIS)
The side impact sensor (SIS) contains a sensing device which monitors vehicle acceleration and velocity changes to detect side collisions that are severe
enough to warrant air bag deployment. The SIS is not part of the deployment loop, but instead provides an input to the SDM. The SDM contains a
microprocessor that performs calculations using the measured accelerations. The SDM compares these calculations to a value stored in memory. When
the generated calculations exceed the stored value, the SDM will cause current to flow through the side deployment loops deploying the side air bags.
