C 3500 Truck 2WD V8-454 7.4L VIN J SFI (1999)
Arming Sensor: Description and Operation
The presence of an Inflatable Restraint Front End Discriminating Sensor enhances the SIR system performance. Use of the Inflatable Restraint Front End
Discriminating Sensor provides timely deployment of the air bags during some crashes. Although this is a mechanical sensor, the front end
discriminating sensor is not a part of the deployment loop but instead only provides an input signal to the Inflatable Restraint Sensing and Diagnostic
Module (SDM).
