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
The stoplight switch is a normally closed switch. With ignition switch in the RUN position and brake pedal not depressed, ignition voltage will be present at the EBCM. When brakes are applied, the ignition voltage at the EBCM will be zero.
Conditions for setting DTC:
- Vehicle speed greater than 35 MPH for 10 seconds followed by vehicle at rest for one second.
- Stoplight switch never switching during the described condition.
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.