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.
Component testing procedure
2010 Ford Focus S, StandardSECTION Component testing procedure
MAIN LIGHT SWITCH - COMPONENT TESTING
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | A good switch will indicate |
|---|---|---|---|
| Off circuit | 4 and 1 | Off | Closed circuit |
| Park | Open circuit | ||
| Headlamp | Open circuit | ||
| Headlamp circuit | 8 and 1 | Off | Open circuit |
| Park | Open circuit | ||
| Headlamp | Closed circuit | ||
| Park circuit | 3 and 1 | Off | Open circuit |
| Park | Closed circuit | ||
| Headlamp | Open circuit | ||
| Fog circuit | 6 and 1 | Off | Open circuit |
| Fog | Closed circuit |
RENDER: 1.0x
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.