Circuit/System Description

The inflatable restraint seat belt buckle switch is within the seat belt buckle and provides an input to the Inflatable Restraint Sensing and Diagnostic Module (SDM). The Inflatable Restraint Sensing and Diagnostic Module supplies a low reference circuit and a seat belt switch signal circuit to determine a buckled or unbuckled condition. The Inflatable Restraint Sensing and Diagnostic Module monitors the seat belt switch circuits and if a fault is detected a DTC will be set.