K 2500 Yukon 4WD V8-6.0L VIN U (2000)
Side Air Bag: Description and Operation
Side Impact Air Bag System Description
The side impact air bag system consists of the following components:
^
AIR BAG warning lamp located in the Instrument Panel Cluster (IPC).
^
Inflatable restraint Sensing and Diagnostic Module (SDM).
^
Two inflatable restraint side impact inflator modules (one side air bag in each front seat).
^
Two inflatable restraint Side Impact Sensors (SIS) (one in each front door).
The inflatable restraint side impact sensor (SIS), inflatable restraint side impact inflator modules, inflatable restraint sensing and diagnostic module
(SDM), and the connecting wires make up the side impact inflatable restraint system.
The SDM contains a sensing device (accelerometer) that converts vehicle velocity changes to an electrical signal. The SIS is treated as a discriminating
sensor and is an input to the SDM. If the SIS determines that the side air bags should be deployed, the SIS tells the SDM to deploy the side air bags. The
SDM will then check to see if there is enough vehicle acceleration to warrant a deployment. If so, the SDM will send current to the side air bag
deploying the side air bag module. Deployment occurs when the SDM receives vehicle velocity changes through the SIS that are severe enough to
warrant deployment.