airbag light on dashboard on 2000 BMW 323Ci

removed passanger seat disconnected electric supply connection once reconnected after repair work on floor , airbag light on dashboard comes on then goes off then back on again

Asked by for the 2000 BMW 323Ci
Bmw has a seat belt sensor that works with the air bag you need a special tool from BMW to reset it or you can go to the dealer to get it reset