Theory Of Operation
When powered, the Occupant Restraint Controller (ORC) sends a test current to the squibs to verify the integrity of the squib and the wiring. These circuits are maintained in a "floating" configuration at the module, (connected to neither power nor ground), as protection against inadvertent deployment. Use of the Supplemental Restraints System (SRS) Load Tool Kit (special tool #8443A, SRS Load Tool) in the tests below substitutes a suspect squib with a known good component. The use of the SRS Load Tool Adapter tool provides a test point, as well as a method for opening the shorting bar connections within the harness connector. The ORC is powered by the Body Control Module (BCM) through both a fused controlled circuit (F929) and a Ignition Run/Start (F945) control output circuit through the 12 pin connector C2-A side of the 96 way ORC module connector. The 12 pin connector C2-A side of the 96 way ORC Module connector provides ground. The Front Passenger Airbag is a three stage device with three electrical connectors. The first stage is deployed immediately during impact that requires airbag deployment. The timing of the second stage determines the output force of the airbag. The third stage triggers a tether cutter initiator, which releases the tether when a softer airbag is necessary.