I had a Citroen ZX with the same problem and it turned out that the wiring for the airbags went through a wiring loom with an in-line plug and socket under the driver's seat. This plug had probably become slightly disconnected because when I disturbed it the light went out. It happened every few months after that and I had to hold the plug and socket together with tywraps.
Icky
February 2008
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