If I may JZ
Hi there Poltac,
If you look under the front of the drivers seat you will see 2 plugs.1big and 1 small.The small one is the seatbelt one, the other is for the lumber support.Check to see if the wires coming from the small plug are going into the seatbelt buckle.If they are not there altogether it may have had new belts fitted.If this is the case just join the 2 wires at the plug and the light on the dash will go off. ;)