William:
You shouldn't comment on subject matter you know nothing about. All of your supposition is clearly unfounded. Technicians routinely use the accessory or cigar lighter receptacle to keep the radio circuit warm in order to retain the radio code.
If you'll think - just for a minute - you'll remember that the cigar lighter has 12V going to it all the time - even if the key is not in the ignition. And the radio (on G.M. vehicles) have the clock keeping time - with the ignition off - which also requires a 12V power source. By supplying an external 12V power source via the cigar lighter or accessory plug, just that curcuit remains active when the battery is disconected from the electrical system.
The accessory circut is completely separate from the airbag circuit - unless some dope has tapped into the wrong power source for an add on accessory in which case, he gets what he deserves!