front seat airbag - why 4 wires?

[Goran]

Thanks, I will order a pair of controller-side connectors from A8parts, I'll need them anyway for a neat conversion.
Now just to figure out where the two brown earthing wires go from the D2 seat airbag (brown plug). Picture to follow tonight. If they just go to a earthing point in the car then no problem. If they go back to controller, then confusion. See Elsa doesn't have those wires on the diagram either. Maybe because they dont go anywhere?