help with wiring head unit

[marcodias1988]

hi all please help trying to fit a new dvd to audi a4 avant b7 . now the yellow blue and orange dont conect to anything so obviously dont turn on. could you please advise if wires need to b cut and if so wich ones to conect it to in the car?pics attached

 

[PetrolDave]

Be helpful to know what the names, or pins they connect to, are of those wires as different manufacturers use different colour codes.