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 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 (special tool #8443A, SRS Load Tool) in the tests below substitutes a suspect squib with a known good component. The use of the (special tool #8443-8, Jumper, SRS Load) and the (special tool #8443-28, SRS Load Tool Adapter) provides a test point as well as a method for opening the shorting bar connections within the harness connector.