Deh-205
orange is power, 12 volts dc used for the clock and memory.
Blue is used to excite an aux., amp.
Red is switched 12 volts dc.
black is ground.
The rest of the wires are for speakers, right & left front, right & left rear.
if you are just trying to see if it works, you don't need to worry about the blue wire.... just tie the red and orange together, hook to the + and the black to the - of a good 12 volt source. Add a couple of speakers and you'll have a pretty nice stereo system.