Hi tommo I asked the same 1-2 months ago but it seems that Robert isn't a visitor here anymore. After some testing I figured out how the button work. You will need to short the 2 cables providing 2V to the switch. So you connect the 12V voltage to the cigarette light and then you connect the 2 wires going to the switch to the com line and the NC line. So when the car powers on the relay shorts the start stop button and so its off.@Robert do you have the scheme of your installation and the name(o link) of this component? TIA