Good news and Bad news .I was able to flash and code the original MRS module of the 2011 BMW 328XI over again with the same existing level to rule out internal corrupted software with my new MaxiSys Elite, but still have the MRS 9419 code persisting for left belt force limiter that won't clear. I then partially removed the center console to tip the rear of it up to access and replace the module with the 2nd hand module from a 2009 and was successfully able to program and code that module to the vehicle without VIN mismatch issues, however the MRS 9419 code persists.
I was suspicious when attempting to clear the code , the tool continues trying with a spiral and doesn't end the process in any timely manner and let you know if it failed to clear code. You hit cancel and it then it tells you codes were successfully cleared and to go back and test again. The 9419 still persists and I even unplugged the harness for the right side harness and created new codes and reconnected the harness and clearing those generated codes was no problem, so I know the Elite can clear past MRS codes. Have to figure the harness resistance is just a little higher than the module wants to see. Have a new left pre-tensioner , I did pin out tests and terminal inspection and terminal drag tests and don't know if I just got another defective MRS module or not ?:-( Looks like the 2 twisted wires comes as part of a harness assembly, (that surprisingly $70 didn't sound outrageously priced enough for what I think the correct BMW wiring loom is going to turn out to be) but the parts guy says there's 2 possibilities and that I would need to get the number off the harness tag ( buried somewhere beneath the carpeting and center of console. Screw that. I ordered twenty five 2.2 ohm resistors from Digikey to make up circuit simulators when I need one. I got a feeling I just have 2 modules that fizzed something inside each one from a past left pretensioner deployment.