Take the bulb outYou're not wrong: my mother's Stilo has a permanent airbag warning lamp (now an MOT failure)... the actual fault is within the occupant classification sensor (WTF!?) in the front seat that decides whether anyone is sat there and if so whether they're a child, so it knows whether to turn the airbag on or off. People kneel on the seat and the sensor breaks.
If it was my car I'd have ripped the whole shooting match out by now...