Well the color matching process is really nothing. When u bought the wiring harness, the wiring color and it's purpose is on the back of the bag. To connect the wires together, just color coordinate. ie - black with black, white with white and so on...

When you say the spkrs just short out, do you mean the fuse keeps on blowing as well? If not, i'd check whether or not you're connect the HU to the correct constant power wire, which is the solid yellow wire. Next time u try it, look at the screen of the HU. This is just a wild guess but it could be causing an overload in the HU, which causes it to shutdown.

Are u running an amp to the spkrs? you said the unit is still on but the spkrs aren't working right? hmm...if no amp then i would say u just hook the front spkrs up to the HU and not the rear spkrs. Just try it and see if they work. Good luck!