Re: Which head units require no wiring harness?
Look at post 23 above. The photos show step by step that it is just a Plug and Play install. Crutchfield sends a harness for FREE , which you don't need in the Crossfire. Trust me.... It's simple.
What code did you use?
Try the code in that posting. If it doesn't work, I'll contact Crutchfield.
Bruce