Head unit color code:
Illumination or Dimmer-Orange/Orange w/white stripe
Blue wwhite stripe-Amp turn on
(Black stripes negative)
If you have a female harness to connect to the veicle side you will pretty much color match. The only exception is that you may only have an amp turn on wire but only a power antenna on the vehicle. In this case you would connect blue w/white stripe wire from radio harness to the blue antenna wire on the vehicle side.
If you are doing a hardwire (factory plug has been cut off) you can obtain a wiring code for your vehicle at www.the12volt.com
for most vehicles.