Originally Posted by Mike@N54Tuning.com
The JB4 turns off the CAN system on map 0 so you should not need to physically disconnect the CAN wires with it. BMWs systems crap out all the time when connecting to cars, perhaps its just something on their end. Maybe have them try to connect/update and if it fails remove CAN wires on the spot to see if that helps.
Mike - I appreciate you chiming in, but I have to tell you, on 2 separate days, where that same computer read other BMW's in between - MY car was not able to be read - it didn't recognize my VIN nor was it able to perform diags. It is what it is, this really happened. I'll be back there to get more work done soon enough, but I had really thought that there was a real issue - but my car is fine (other than the typical emission codes due to the cats being removed).