Silhouette FWD V6-3.4L VIN E (2004)
Impact Sensor: Description and Operation
INFLATABLE RESTRAINT FRONT END SENSORS
The front end sensors are equipped on vehicles to supplement the SIR system performance. The front end sensors are electronic and are not part of the
deployment loops, but instead provide inputs to the SDM. The front end sensors can assist in determining the severity of some frontal collisions. The
SDM uses the input from the front end sensors to assist in determining the severity of a frontal collision further supporting air bag deployment. If the
SDM determines a deployment is warranted, the SDM will cause current to flow through the deployment loops deploying the frontal air bags and
pretensioners.
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.