Boxing in the back ??

Hey.
In my V8 the boxes don't work in the back!

I checked the fuses before. but are healed.

Now I don't know any more had the Gamma OriginalRadio in it back then! And there the boxes did not work out..
But when the radio was turned off, there was a clack in the back of the box...
He doesn't do that anymore at my blue point.

Wisst ihr vielleicht was dein sein kann ?

Do you need some pictures of the keys or the boxes?

Because there are some cables that are off.. etc.

Only 4 black/green cables come with the box iso

I guess that's for left and right +- front!
Right?

Thank you!