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.
Satellite Acceleration Sensor: Operation
The Satellite Acceleration Sensor (SAS) provides verification of the direction and severity of the side impact to the Occupant Restraint Controller (ORC). The ORC controls the front and both the right and the left seat airbags. In the event of a front or side impact, the ORC will send an electronic signal to deploy the appropriate airbag (front driver and passenger or side seat airbags). The SAS periodically transmit the acceleration data to the ORC by modulation of the current on the power supply.
The accelerometer pulses are sent to a microprocessor, which contains a decision algorithm. When an impact is severe enough to require airbag protection, the ORC microprocessor sends a signal to deploy the side airbag that completes the electrical circuits to the right or left side airbag. The ORC is calibrated for the specific vehicle and reacts to the severity and direction of the impact.
The ORC microprocessor continuously monitors all of the passive restraint system electrical circuits to determine the system readiness. If the ORC detects a system fault, it sets a Diagnostic Trouble Code (DTC) and controls the airbag warning indicator operation accordingly. The side impact sensors receive battery current and ground through dedicated driver and passenger sensor signal and ground circuits from the ORC. If the sensor is dropped it must be replaced. Disconnect the battery or remove both airbag fuses before servicing impact sensors.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.