ISO connections

I have a Blaupunkt radio which came from a Micra. The model no. is BP6340.
There are three sockets, two with 6 connectors each and the other with 4 connectors. They look like: -

...xxx...
. - - - . First socket - terminals 1 2 3 / 4 5 6
. - - - .
.........


.....xxx. Second socket - terminals 7 8 9 /10 11 12
. - - - .
. - - - .
.........

.......
. - - . Third socket - terminals 13 14 / 15 16
. - - .
.......

I'd appreciate identification of these terminals.

Many thanks.

Sorry for the poor attempt at a diagram!!

Here is the URL for an image of the back of the radio, with terminals numbered.
http://i23.photobucket.com/albums/b368/AOnePics/iso.jpg

Help appreciated!