my 1.4 active sport has the CD/MP3 radio head installed, playing with the stearing controls, one of them cycles through the FM/AM etc options, one of these is AUX. what I need to know is how do I conect to the AUX imput, what pins is it????

Any help greatfully recived

The AUX will probably be on the back of the radio. It might be RCA inputs or it might be like a headphone socket (though probably not if it is on the back).