Which wire carries power only when the lights are on?

almost positive it is the orange wire.

 

Should be. That is generally the illumination wires color.

 

If you're JBL its green. Just double check it with a tester when you turn the lights on.

 

This is a very easy fix! I will be doing my head unit install Saturday. I will be using the wire that powers my shifter illumination lights in my center console. I will post the color of the wire and pics this week end. Simply a 12 volt source when parking/headlights ate turned on. I have the pioneer AVH-P4400bh