Join Date: Jan 2017
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Changing the seat is a bit drastic. It sounds like you have a wire not making proper contact with the sensor in the seat belt buckle. As bugsb says this is not something to experiment with but could be fixed relatively easily by someone who know what they are doing.
Currently in Brendan W's garage:
2007 1.6 petrol Grand Scenic, 2003 V70 D5, 2001 Punto 1.2, 1980 Suzuki GS850G