Convert iPhone six wire to usb 4 wire

[launchteam1]

I have a solar charger for an iPhone 3 that has been damaged. Where the existing loom has six wires (white, yelow, blue, red, black and green) that go into the 30 pin plug that then goes into the iPhone to charge. I'm wanting to convert this 6 wire loom to a female 4 wire USB port. I can't find anything that will show me a pinout except for all 30 wires. The connector is so small that I can't tell which pins these 6 wires go to. Can anyone help me with this conversion?

 

[(*steve*)]

GND, +5V, D-, and D+ are the 4 connections which go to a USB connector.

I suspect that the black and green wires are connected (test this) but I don't know what the EN line is for (enable?). Maybe you can leave it disconnected, maybe you need to do something with it??