I have no knowledge of smart in particular concerning this, but on my other German cars, it takes a special tool to reset the airbag, a totally different tool than the one to reset stuff in the rest of the system. I am sure our Evilution guy will have the answer, but I bet it is a special tool other than the OBDII type most people have lying around. If it is not, than yippee, as that will be one less thing to buy after the warranty is over.