I guess I am out of suggestions. If you were near me, we could plug in my Foxwell NT-510 and see if it would clear the error. Short of that, maybe a diagnosis at the dealer?

That particular airbag module (Part Nr. 6900727) is notorius to get corrupted. A simple system fault can make the internal check sum missing so it's showing internal fault and you can't clear the codes. This problem can be rectified but it has to be done on a bench programming the EEPROM. Not sure who does these things there. (A friend of mine here in Finland does these among other things.) You can source a used module as a replacement but there is a high probability that it's corrupt too. There is no other direct replacement for this version module but another 6900727.

If everything else fails there is one solution where you install a slightly newer module version but then you would also have to renew the side impact sensors for the newer models so they are compatible with newer module. All other system components should be compatible with the newer module version.
.

Not exactly what you're reporting there, but almost every time I open up my driver's door (sadly, probably twice a year LOL) I end up reconnecting power after having disconnected the driver's door airbag (with power disconnected while doing that). As mentioned above, it is for driving the window up/down, testing a lock actuator, etc. Restoring power with the airbag disconnected sets the airbag light, and turning that light off requires some sort of special tool (battery disconnect will not do it). And resetting with the tool does work every time, without leaving any problems behind. Have done this many times.

In general, I'd try to see if any further tests will get you info. Such as:
remove the driver's door airbag. leave it disconnected. Power up, scan, clear codes, see what you find.
Similar with passenger door airbag.
Consider swapping those airbags left to right.
Is the driver's door airbag the original part?

The fact that the airbag light only appeared after the shop did their work must be related to whatever is wrong here.

Random fact - on my 2001 E53, I recently went through some careful testing of the central locking with my Foxwell and PA Soft. From saving the screen shots of that, PA Soft says that I have a:

70 [112] Seat occupancy detector, break of seat mat Shadow code / yellow / Fault not currently present.

That PA Soft fault (yellow) remains even after clearing everything in the Foxwell, and with Foxwell showing nothing wrong, and no airbag light is on.

Thank you very much for the information. I have found a couple services online that claim they can do this service. I was quoted $35 for my model at Airbag Computer Modules New, Used, Exchanged or Repaired. Airbag Systems, Inc. They even use a prepaid UPS shipping label for you to use to send them your ecu. Then they contact you and let you know when it has been repaired, and they send it back to you, and charge you once it's shipped.

That sounds promising and at first glance on their website they probably know this problem and how to rectify it.

Any resolution? Did you get the module reprogrammed?

I have yet to get this module reprogrammed, I unfortunately had to cough up a significant chunk of change for a transmission rebuild for my X5, and the airbag module got put on the on back burner, even though i should have had it done while the rebuild was happening, I'm still going to send it off at some point, probably this spring or summer when I can let her sit and use my other car for getting to work. Researching current places in the US that i can ship to, and have several choices, if anyone knows a reliable place that i can send it to get reprogrammed, please let me know. Thanks!