Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Occupant Restraint Controller: Operation
The impact sensing device is located inside the ORC. The sensing device provides crash severity discrimination and confirmation of a crash. The ORC monitors the system to determine the system readiness. The ORC contains on-board diagnostics (OBD), and will illuminate the AIRBAG warning lamp on the cluster when a fault occurs. The warning indicator is illuminated for six to eight seconds every time the vehicle is started.
The microprocessor in the ORC monitors internal components and the airbag system electrical circuits to determine the system readiness. If the ORC detects a monitored system fault, it sends messages to the instrument cluster over the PCI data bus to turn ON the airbag warning lamp. A decision algorithm in the ORC microprocessor determines when the deceleration rate is severe enough to require airbag system protection. When the appropriate conditions are met, the ORC sends an electrical signal to deploy the frontal airbags. The impact sensing device is an accelerometer that senses deceleration, which provides verification of the severity of an impact. The ORC is calibrated for the specific vehicle, and is only serviced as a unit. The ORC also contains an energy-storage capacitor. The purpose of the capacitor is to provide airbag system protection if the impact has damaged or disconnected the battery. The ORC cannot be repaired or adjusted, and if damaged or faulty, must be replaced.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.