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/System Description
After the traction control switch (TCS) is pressed and released, the LED on the switch illuminates. The body control module (BCM) illuminates the LED by supplying adequate current to the high side of the LED. The BCM supplies a low current, 12-volt signal to the TCS requested indicator control circuit, when the LED is commanded OFF. The BCM monitors the feedback from this signal to detect opens or shorts to voltage in the LED control circuitry.
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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.