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.
Control Module
Differential Electronic Module (DEM) is directly secured onto the clutch unit housing and together with the axial solenoid constitutes one unit. The axial solenoid controls the control valve.
The Differential Electronic Module (DEM) receives signals via the Controller Area Network (CAN) from:
- Engine Control Module (ECM)
- Central Electronic Module (CEM)
- Brake Control Module (BCM)
- Driver Information Module (DIM).
Conducted by these signals, the Differential Electronic Module (DEM) determines how high the oil pressure to the clutch unit should be. The oil pressure to the clutch driven plates is decisive for how much torque can be transferred to the rear wheels.
Four-wheel drive does not function in the event of a fault in the Differential Electronic Module (DEM).
Use the Manual With the Right Hardware
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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.
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