Would agree normally but....The belt clip is the usual suspect, wires going into it tend to break and give false signal of the belt being unfastened.
WaterSorry yes it’s on even without anyone in the seat. I cleaned the seats with a karacher carpet machine meant for cars. I thought there my be some process of reprogramming when then are resinstalled. Looks like I’ve caused another problem!
Not quite.May be misreading OP but I'm reading it that the warning is on all the time, without anyone in the seat???
Which makes seat belt sensor/wires irrelevant.