1998 blazer cd player wiring pinout for "AUX"

Does anyone have the pinout for the 9-pin connector on the back of the delco cd radio (part #09356055). I'm trying to wire in an MP3 player to the radio using the "AUX" channel. I've seen interfaces by companies but I don't think I need to spend $100+ to get this done. Any help would be greatly appreciated.
Thanks!