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.
Stop Lamp Switch
The brake light switch is located by the brake pedal lever. The stop (brake) lamp switch self-adjusts during installation. The brake control module (BCM) receives information about the status of the stop (brake) lamp switch via the engine control module (ECM). The stop (brake) lamp switch signal is used by the brake control module (BCM) to diagnose faults in the pedal position sensor. The signal is also used to disengage traction control if a fault is detected.
The stop (brake) lamp switch is supplied with power from the battery. When the switch is closed, the power for the signal is supplied through the engine control module (ECM). The engine control module (ECM) then transmits a signal via the Control area network (CAN) indicating that the stop (brake) lamp switch has been activated.
There are diagnostics for the stop (brake) lamp 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.