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.
DTC C1249/49 Open in Stop Light Switch Circuit: Description
The skid control ECU (housed in the actuator assembly) inputs stop light switch signals and the brake operation condition.
The skid control ECU has an open detection circuit, which outputs this DTC when an open is detected in the stop light input line or the ground line of the stop light circuit with the stop light switch off (brake pedal not depressed).
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1249/49 | When IG1 terminal voltage is 9.5 V or more, an open in stop light switch circuit continues for 0.3 seconds or more. |
|
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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.