how you remove a airbag signal
remove the airbag
A quick fix would be an airbag simulator. The reason why the lamp is flashing is that the censor in the seat is broken and it therefore cant determine whether a person is sitting in the seat or not. A simulator causes the censor to think that a person is always seated and in case of a crash the airbag goes of with or without a person sitting in the seat. It fixes your problem right away and is not that expensive.