Airbag Error lamp stays on?

Hello all,
I have a problem with my car. It is a Daewoo Lanos sedan. The Airbag indicator lamp will not switch off anymore. To be specific: when I switch on the ignition, the lamp will be on, this was normal. After a couple of seconds, it will be off, this is normal too. And then, after one second, it will be on again, and this is NOT normal, it should stay off.
It is not a real problem, but it is not the normal situation. I would like to fix the problem....
I had no collision, did not hot a tree, did not bump into anything. One thing may be a connection: I had to disconnect some parts of the dashboard, to exchange some pilot lamps which were defective. I think (but not sure) the problem came after this action.
I already checked all connectors and wiring. After disconnecting the dashboard again. It seems to be OK.

Any idea how I can solve the problem? If I go to the Daewoo dealer, he sure can fix it. For some ??? amount. But maybe the problem is easy to solve?

thanks for the help
Marco
email: m.polak@sanquin.nl