I was directed to this thread from another thread. I am in the process of trouble shooting my own EDC shocks on my 2001 740iL. Im in the US and having google translate the forum, so it can be hard to do proper searches.
Some thoughts on the previous posts, from my research. I am in the process of creating a doc that covers all there is to know about EDC - because all the info is spread across many BMW docs and many forum posts, and much of the info is just wrong. Once i have finished i will post for feedback and review to see if i got anything wrong. But anyone that says anything is wrong will have to point to a source!
Here are a few bits of info that i have found so far, to add to the discussion:
1. The shocks are switched in pairs - two fronts together and 2 rears together. So if the front left is Hard then the front right is Hard. But the rear left and right can both be Medium while the front is Hard. It is up to the EDC control Unit.
2. The shocks are switched 4.5v and 1 amp per shocks, so 2 amps for front and 2 amps for rear. They are not always on and then grounded.
3. Each shock has 3 wires - 1 power line for each valve (there are two valves) and then 1 ground line.
4. The two valves are Medium and Soft. Hard is when both valves are off. Medium is when only the Medium valve is on. Soft is when only the Soft valve is on. The two valves are never on at the same time. Note that there is a default "valve" that is always on, which is how oil passes during the Hard mode. So the additional two valves are just increasing the total diameter of flow available for the oil to move through.
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