OK, I just understood I forgot to mention the vehicle is from 2001 =).
If you can prove the fault is caused by a low battery and nothing else, this would seem to be a critical bug in a safety system. In which case the manufacturer ought to recall the units, regardless of age.
Good idea, but for that I need to get inside the damn thing.
Call me paranoid - but I get uncomfortable when discussions involve playing around with primary safety systems in motor vehicles.
Even if you do succeed in "clearing" the fault - how do you know you haven't affected something else?
Well, now airbags are not working at all. And there are a lot of other not very safe things in such an old car.
The video pointed out a good use of air bag EEPROM tampering -- to wipe out evidence after a crash. Besides, I see no reason to tamper with an air bag controller. The risk makes it doesn't worth it.
Air bag controllers use special capacitors and IC mounting methods as well as footprints to make sure it can handle the most Gs even if other systems in a car fail, and this is for a reason.
If the system has already been subjected to a high G impact, the reliability may be lowered to a dangerous point.
Yes, I want to wipe out crash data. And go to jail for evidence concealment. Because it's fun this way, and I don't have 50 bucks. Also I cannot destroy the thing. Genius plan.
It seems somewhat unlikely to me that the system will disable itself on a single low voltage brown out event? (especially as i has a massive ride through cap on it, that is designed to fire the bags even if the vehicle supply has been disrupted by the impact).
I know, this is just something I've found on internet, and it kinda explains why the error is there in my case. It really appeared after winter, when I once had an empty battery.
Did you check if there are any recalls for your A6 model?
It's an old car, but still - never found any information on such recalls.