Passenger windows won’t operate from their own switches but only from driver door

[AI-Audi]

Hi, My Audi A4 b8 Avant has had issues with door locks, I’ve got them replaced twice in last 3 years. They all work fine now.
But recently all passenger door windows stopped working from their individual switches, they still work from master switch at drivers door though.
Even though I was not convinced that all switches have gone wrong at the same time I still replaced all the window switches including the driver door master switches to check however it didn’t resolve the issue.
I’m very basic in cars DIY so don’t know where to start :(
Any one has any idea what may have gone wrong so I can check and if required can go to a relevant mechanic?
Many thanks in advance

[Crasher]

The convenience system in the right of the boot controls the locks and windows and it has very good self diagnosis as well as live dat output that shows the inputs as does each door controller so a system such as VCDS is required, solving this without a diagnostic system will be extremely difficult and as you have found, working parts will get replaced needlessly.