Hi there, I have a new square shape sirion from 2006.

It did not have the factory AUX connector, so I purchased a later radio off ebay which did have the AUX connector on top.

It has 4 pins. The thing is, I need to know which pin is which

There are 4 wires on top of the unit on a 20 pin toyota type AMP connector. The colours are purple, orange, blue and green/grey(not sure)

I take them to be left, right, common and ground detection

I have sent a link to some pictures - https://picasaweb.google.com/lh/sredir?uname=112688687816351310457&target=ALBUM&id=5972010074119466769&authkey=Gv1sRgCNbdje-Dg-imhwE&invite=CIGM9-EF&feat=email

I just need to know which wire is which. I assume then that I connect the common and ground together on a 3.5mm jack and then the left and right seperate

All help much appreciated

Alan