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.
Code A033: Brake Switch Open
Voltage is continuously applied to the brake switch. When brake switch is closed, voltage is applied to brakelights and terminal 1C11 (Light Blue wire) of anti-lock brake controller. The anti-lock brake controller can sense when brakes have been applied because voltage is received at the brake-apply input. To set Code A033, the following conditions must occur.
- Anti-lock brake controller senses no voltage at terminal 1C11 (Light Blue wire).
- Anti-lock brake controller senses two wheels are slowing at a rate that would be improbable without using the brakes.
- Checks for improperly adjusted or intermittent brake switch.
- Checks for improperly adjusted or intermittent brake switch.
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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.