Where does this wire go?

[jdiablo]

I'm installing a Pioneer AVH-p5700DVD and I can't figure out where to hookup this wire,maybe because it was 12 at night or something,lol but I can use some help,and also for the orange(illumination) wire i have one on the schose wiring connector,but not on the one provided with the HU,should i just cut the one orange wire off my stock harness and connect it to the orange one on the schose?

Here is the wire im talking about

 

[jdiablo]

Just use this link that pic it to small.

 

[jdiablo]

http://i32.photobucket.com/albums/d19/john3030/cono.jpg

 

[jdiablo]

Ahhh stupid pic,anyway it says

violet/white:
Of the two lead wires connected to the back lamp,connect the one in which the voltage changes when the gear shift is in the REVERSE postion.

Where do i hook this wire up to?thanks
BTW its a 03 mountaineer

 

[jdiablo]

Ttt