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.
1992 Mazda 929FACTORY OEM SERVICE PROCEDURE
Continuity Test
- Disconnect stoplight switch connector. On Miata, using a DVOM, check continuity between White/Green wire and Green wire with brake pedal depressed. On 929, using a DVOM, check continuity between Green/Yellow wire and White/Green wire with brake pedal depressed. Ensure continuity exists. Release pedal, and note reading on DVOM. Continuity should not be present.
- If continuity is not as specified, check STOP fuse and wiring harness. Check wiring harness between stoplight switch and control unit. Repair or replace if necessary. If fuse and wiring harness are okay, replace switch.
Factory Service Tools
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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.