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
The body control module (BCM) contains the 2-amp EPS fuse. When the ignition is ON the BCM supplies voltage to the ignition circuit to wake up the power steering control module (PSCM). The PSCM receives a serial data message from the BCM to determine the position of the ignition switch. When a power mode message is received, the PSCM monitors the ignition voltage circuit to detect if a short to voltage, short to ground, or an open exists.
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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.