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
TCC normally closed brake switch supplies battery voltage signal on TCC/brake switch signal circuit to PCM. Circuit is open when brakes are applied. Brakelight/cruise control normally open brake switch supplies battery voltage signal on cruise control brake switch signal circuit to PCM when brakes are applied.
DTC will set when switches disagree for 10 consecutive minutes, or TCC and cruise control brake switches are not toggling open and closed during 6 brake applications on same ignition cycle.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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