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.
EDC Satellite Control Unit with Damper: Notes
The VDC dampers on the rear suspension are either steel-spring or air-spring versions depending on the optional equipment fitted.
| Index | Explanation |
|---|---|
| 1 | VDC damper with steel spring |
| 2 | VDC damper with air spring |
| 3 | Front EDC satellite control module |
| 4 | Rear EDC satellite control module |
| 5 | EDC data-map valve for compression control |
| 6 | EDC data-map valve for extension control |
| 7 | EDC data-map valve for extension control |
| 8 | EDC data-map valve for compression control |
| Index | Explanation |
|---|---|
| 1 | Damper tube |
| 2 | EDC satellite control unit |
| 3 | EDC data-map valve for extension and compression control |
| A | FE = Extension force |
| B | FC = Compression force |
| C | VE = Extension velocity |
| D | VC = Compression velocity |
| E | Extension and compression characteristic data map |
Difference between a VDC (1) and a VDC (2) damper:
A VDC (1) damper with only one EDC data map valve uses combined extension/compression adjustment which has to be cycled extremely rapidly.
With this type of control, the damper adjustment is based on wheel frequency.
The wheel frequency is the frequency at which the wheel oscillates along the z-axis.
| Index | Explanation |
|---|---|
| A | Extension progression |
| B | Compression progression |
| 1 | Damper tube |
| 2 | EDC data-map valve for extension |
| 3 | EDC satellite control unit |
| 4 | EDC data-map valve for compression |
A VDC (2) damper with two EDC data-map valves uses independent extension/compression adjustment which does not demand such a high cycling rate.
With this type of control, the damper adjustment can be based on body frequency.
The body frequency is the frequency at which the body oscillates along the z-axis.
| Index | Explanation |
|---|---|
| 1 | EDC data-map valve for compression |
| 2 | EDC data-map valve for extension |
| 3 | Force/direction of piston rod movement |
| 4 | Fluid medium |
| 5 | Data-map control |
| A | FE = Extension force |
| B | FC = Compression force |
| C | VE = Extension velocity |
| D | VC = Compression velocity |
| E | Extension data map |
| F | Compression data map |
The two EDC data-map valves firstly enable independent extension control and, therefore, data-map compatible design, and secondly independent compression control and, therefore, data-map compatible design.
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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.