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4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector
at the cable
iPod Pin Pin
Name
USB pin usb color
1 USB DATA - / Left Channel 2  white
2 USB DATA + / Right Channel 3  green
3 GND Casing  black
4 VCC 1  red

 Remember that this jack is also the headphone jack. The conversion from audio to USB data (+ and -) occurs in the circuit board within the adapter base.  Also there is a common diode between the VCC and GND to ensure perfect isolation of VCC.

 

4 pin USB A plug connector layout
4 pin USB A plug connector
According to 26 reports in our database (24 positive and 2 negative) this pinout should be correct.

Is this pinout
Apple iPod Shuffle (2G) USB interface visual pinout:click to enlarge
Source(s) of this and additional information: blog.makezine.com, http://www.beyondlogic.org/usbnutshell/usb2.htm
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