Audio Systems: CD Changer 97 Saturn SC1, saturn sc1, auxiliary input

Question
Hi.  I want connect a wire with a 1/8 inch jack on one end so I can play my mp3 player through the car stereo Aux.  I see the cd changer jack dangling in the trunk but have no idea what wires to connect to.  Also, something in that jack indicates there is a changer connected so when you press the ax button on the car stereo it can play through.  Can you help?

Answer
it is possible not that simple, the radio needs to see the cd changer  before it can open that port with the source or aux button

there is a aux audio input interface that plugs into the 10 pin cd changer cable in the trunk and  tricks the radio
follow this link

Saturn gm auxiliary interface

http://www.oemautosound.com/pc-337-171-pie-gm10-aux-saturn-auxiliary-input-adapt...