Diagram Information

[AVAGO]

Howdy all
Not sure is anyone can help, I have an Octavia 1.9TDi (110 )
2002 est. What I'm looking for is a wiring diagram / information for the Symphony car stereo. Reason: I have just purchased a Parrott CK3100 Bluetooth car kit which uses the power/audio ect from the back of the unit. The Ck3100 comes with an ISO lead but i'm not sure if it correct. I might have to make another ISO up. The only information I can get is that PIN2 on the black block is the audio mute. The car stereo has the CD changer in the boot, any help or what the pin outs are, all the blocks are colour coded on the back of the unit.

Mucho Ta