how to make horn workk, dc2r srs steering wheel in eg

Hey guys, quick question
how to make horn workk, dc2r srs steering wheel in eg with no srs?

press the button. the horn is just meant to earth out. im pretty sure the horn has power going to it then the switch just grounds it out.

so find a way to plug in the original horn cable so that it will earth out when u push on the dc2r one.
i really need pics of the back of the steering wheel and the coloumn with the horn cable next to it