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 ON, SDM performs tests to diagnose critical internal malfunctions. IGNITION 1 voltage and deployment loop voltages are measured to ensure they are within normal ranges. SDM then performs RESISTANCE MEASUREMENT test. DRIVER LOW terminal No. 10 is grounded through a current sink and an internal constant current source is connected to DRIVER HIGH terminal No. 9. By monitoring voltage difference between DRIVER HIGH and DRIVER LOW, SDM calculates resistance of driver deployment loop using measured voltage.
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.