Our local BMW guy has been having pc issues, but he may well stop in. I am not a bmw guy but can still offer support. It is not uncommon to have to study a system as there are so many out there. So..
This car seems to have CAN technology. Controller area Networks. In essence various modules "talk" to each other on data. IF one of the modules drops out, a communication problem occurs and can make an extreme impact.
Since communication is critical on this system I would be looking at all connectors being clean, connected and tight. There may be a corrosion problem or simply a connector not connected or connected to a worn connector. Not likely on the latter but I have seen that happen on a few cars.
I'll see if I can get you electrical diagrams if you don't have them. Let me know.
Thursday, October 21st, 2010 AT 6:37 PM