I have a weird issue. My car is a factory bought bone stock ZCP, and at some point EDC modes and servotronic steering modes altoegether stopped working. With the exception of M engine power mode which still works. It does not matter if you use the center console button directly (for EDC, servo is only through idrive) or the idrive M-drive settings + steering wheel M button has no bearing whatsoever.
There was no warning messages (i do not have a code reader) but I remember how switching modes used to have a discernable effect (especially servotronic "Normal" and "Sport" steering modes).
What is puzzling is that all leds still turn on/off as they should except EDC and Servo do not work (I can feel that servo is always in sport no matter, EDC probably always sport mode )
I looked at the electrical system diagram from the aftersale doc (reproduced below) and I see there is a separate EDC-K module. If this has failed it would explain why EDC isn't working but the servo valve (numbered 1) is controlled directly by the DME (numbered 2), so that would point to a separate issue but they have both stopped working, I tend to think there is a common link , could it be in software ?
Could it be that when the EDC module fails, the DME automatically disables servotronic modes too ? Hopefully the right guy who knows those modules coding in and out can chime in.
I could simply go to the dealer and have them figure it out, but i'd rather know as much as possible about the issue first as it seems like a ticket for them to race my car all day long and i could not find anything on the forum through search.
