What is the KGM Servotronic? There is a Servotronic for Active Steering on the rack and pinion, but I think it goes thru a different module. You can also check you battery condition using ISTA, I forget where it is at, but its there. I'd check battery first, connectors next.
There are several sets of documents uploaded over here that discuss Active Steering that may be helpful. DSC and active front steering.
There are several sets of documents uploaded over here that discuss Active Steering that may be helpful. DSC and active front steering.