If you unplug the airbag while the battery is connected, or plug the battery back while the airbag is disconnected, it will set a code and the light. A normal generic scan tool will not reset it. You need a BMW specific tool. Shops that work on BMW will have. Dealers, too. The electrical plugs are available from the dealer, but I would ask if your shop has a BMW capable reset tool (not generic) before worrying about more parts.

P.s. It's very dangerous to handle the airbag without disconnecting the battery and letting the system discharge for a while.

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles