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.
Coupling Unit And Control Module (Differential Electronic Module)
The hydraulic component consists of 1-5, the mechanical component consists of 6-10 and the electronic component consists of 11-14.
- Pressure valves
- Accumulator
- Oil filter
- Annular pistons
- Control valves
- Input shaft
- Inner and outer wet plates
- Sinusoidal cam disc
- Rollers with annular pistons
- Output shaft
- Electric oil pump
- Stepper motor for the control valve
- Temperature sensor
- Control module for all wheel drive (differential electronic module)
The differential electronic module is integrated with the coupling unit.
The differential electronic module communicates with other control modules via CAN.
The control module has no internal diagnostics.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.