IVI head unit pinout and centre speaker

dear all,
I’ve IVI head unit IVI high withot a2b row in DS7 2024 and DS42024

that should mean: IVI head unit high definition display, no audio through CAN BUS. ( 4 standard audio Front right & Front Left ; Rear RIght and Left.

2 questions:

1: I would like to know info about green connector.

is it for the front camera?
is it for the side cameras?

2: on DS4 I have also the centre speaker active and working.
How is that possible to have a centre speaker with only four outputs?
I supposed this extra fifth channel arrives from pin 3 and pin 9 of the big blue connector,
but they are not used

the same for big black connector



thanks in advance,
regards

This is a connector for an additional display, such as the one in the DS4.

It is powered via the telematic unit (SOS, DSassistance).