[http://pinouts.ru/PortableDevices/ipod_shuffle_pinout.shtml|THIS] link may assist you. It is listed as the 2G Shuffle but suspect the wiring is the same
+
+
EDIT [http://pinoutsguide.com/PortableDevices/apple_ipod_shuffle_3g_pinout.shtml|The 3rd gen] is the same
[http://pinouts.ru/PortableDevices/ipod_shuffle_pinout.shtml|THIS] link may assist you. It is listed as the 2G Shuffle but suspect the wiring is the same
HIH