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.
Final Drive Control Module
The Final Drive Control Module (FDCM) (2) is a microprocessor-based assembly, controlling a 4X4 Transfer Case and Front and Rear Electronic Limited Slip Differentials (ELSD's). Communication is via the CAN serial bus. Inputs include user selectable 4X4 modes that include 4WD Full Time (4HI), 4LO, Neutral. The logic and driver circuitry is contained in aluminum housing base and a stamped steel housing cover with an embedded heat sink See Fig 1.
The FDCM is installed inside the passenger compartment underneath the driver side of the rear seat.
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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.