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 switch is turned to RUN position, SDM performs tests to diagnose critical internal malfunctions. IGNITION POSITIVE VOLTAGE, 23 VLR and deployment loop voltages are measured to ensure they are within normal ranges. SDM monitors voltages at DRIVER LOW terminal No. 3 and PASSENGER LOW terminal No. 4 to detect shorts to ground in air bag module circuits. Service wait time is 10 minutes. See DISABLING & ACTIVATING AIR BAG SYSTEM before replacing SIR components.
NO RELATED
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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.