Ok, I connect a cable from the shield of the av cable on the chassis of the tv tuner and it's working
I have the video, that's one things...
But I have no sound :s
I checked the wiring diagram of the white plug and I know that the pin 4 is positive and 5 is the ground for the av audio!
Is it right?

Another things, the retro fit cable I have buy has 2 little pins that i have to plug in the tuner...
Like this :


Is it correct? as I read, with or without cd changer doesn't matter, i have to plug the wire in pin 11 and 12!
But, is there some change if i have harman kardon instalation?

I'm lost and I really don't know what to do to have the sound coming from the audio input for the av ...