Vauxhall Astra Stereo Wiring Colour Coding / Diagram Needed.?

Question

I am installing a LCD screen head unit in a 2002 Vauxhall Astra. Unfortunatly someone has chopped the wires from the block and I now have no idea of which wire is which. Could anybody tell me what colours serve what purpose? Or maybe someone has a diagram. Have googled it until my face tunred blue to no avail. Any help would be greatly appreciated.

Answer 1

Red  = 12v

Black (or Another Red) = Ignition 12v

Brown = Earth

Speakers (check these with a small battery)

They will be somethin like

Blue & Brown/Blue

White & Brown/White

Yellow & Brown/Yellow

Green & Brown/Green