So BMW uses the same system, apply what you know from BMW and fix the car.

If you were working on BMW the only difference would be that you would have to have a $20,000 scanner to get the wiring diagram or diagnostic info, unlike MB which publishes such. You would still need some sort of scanner to talk to the car but only a BMW scanner would include the unpublished info.

Building motors is childs play compared to dealing with these kinds of problems. I have read this and the other thread about ASR and I'm at a loss to help. You have no tools (not MBs fault), and you have no info, (definitely not MB's fault).

Your cheap shot comparing BMW diagnostics, got my keyboard in gear.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician