matsushita amplifier under passenger seat

Good afternoon All,

I realise that this i s probably a question that has been asked many times but I am unable to find a post for it, so if anyone can help - much appreciated.

My problem is that I have a 2006 (NFL) ANH10, the OEM head unit was playing up, so bit the bullet and bought the android , so far so good. I had been through this process on my 2003 ANH10 and no problems. However This one has a Theatre Sound system with a Matsushita amp underneath passenger seat, and so more complicated.

What i would like to do is to connect the speaker input from the new unit into the amp input to utilise all of the existing speakers.

Does anyone have the pinout diagram for the 20 pin plug on the left of photo so that i can splice the new wires directly into it.

I realise that I have to also connect the amp on wire from head unit .

All help and comments greatly appreciated