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.
Principles of Operation: Notes
The ABS electronic control module manages the anti-lock braking, roll stability control (RSC) and traction assist systems to help maintain vehicle control during acceleration, deceleration and certain vehicle maneuvers. The ABS module also communicates with the PCM along the high speed communication area network (HS-CAN) bus for traction assist operations.
When the ignition switch is in the RUN position, the ABS module initializes and carries out a preliminary electrical check and the hydraulic pump motor is turned on for approximately 1/2-second. Any malfunction observed during this test disables the traction assist and roll stability control system and illuminates the ABS warning indicator. However, the power-assist braking system functions normally.
The ABS warning indicator will also illuminate during an ABS event and during a stability control event.
In extreme cold conditions (temperature less than -25°C [-13°F]), the ABS module will briefly operate the hydraulic pump motor when the accelerator is pressed. This is done to warm the brake fluid.
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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.