C 3500 Truck 2WD V8-6.6L DSL Turbo VIN 1 (2002)
Impact Sensor: Description and Operation
Inflatable Restraint Side Impact Sensor
The Side Impact Sensor (SIS) contains a sensing device (accelerometer) which monitors vehicle acceleration and velocity changes to detect side
collisions that are severe enough to warrant air bag deployment. The SIB 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.
