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.
Circuit Description
When ignition is turned on, Sensing and Diagnostic Module (SDM) performs continuous diagnostic tests on deployment loops to check for proper circuit continuity and for shorts to ground or voltage. Sensing and Diagnostic Module (SDM) monitors front end discriminating sensor circuit for front impact detection. SDM processes this signal to further support deployment of air bags. Front end discriminating sensor is an input only device and is not part of deployment loop.
NO RELATED
Use the Manual With the Right Hardware
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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.