A6 C5 2.5 Tdi V6 - Headlights and rearlights doesnt work

[Tnick]

Hi there, i try to explain my situation detailed as i can ( please forgive for my english )

Im owner of an A6C5 year 2001, engine code : Ake, 132kw manual quattro
I aprox the third of forth owner, so it might have some modifications i did not know
Before two days ago, when i started the engine, my headlights and rear lights automaticaly turned On ( No need to switch from "0" to "1" on my light controller )
From yesterday when i start the engine, the lights didnt turn On (Headlights and rearlights) i also noticed the lights didnt light up on my dashboard , on audi symphony radio, on climatronic and the buttons above my head (light switch)
(Only few of them lighted up, see the photo i attached)
937692

I need to turn the switch from "0" to "1" , and only the headlights turned on, nothing else
So at night i must drive with a non functional rear lights, its pretty dangerous not onyl for me, for everybody, and also i cant almost see anything on my dashboard, buttons etc, so i really need to fix this as soon as possible

Can somebody provide me what kind of "mod" it might be installed on my audi, or where can i possibly find the problem
I wanna mention here few things, it might help to understand more my situation:
Fuses are ok, im an electrician, but i have only basic understanding on cars ( wirring etc )
if you look at the pic i posted, you can see the Green light icon didnt show up so the dashboard can notice that my headlights does not work, more interesting is when i turn the switch to 1, even when the headlights still working, the green icon didnt show up, but interestingly it shows the blue light icon when i am using the long range lights
2 times it went back to normal yeastarday for few hours, but today no luck

[fuzz1]

Hi
Only a magician would be able to tell you the mod made.

Have you check if it's a faulty switch? Though unlikely that would be the issue in this case
Have the car scanned for any fault codes

[Tnick]

Hi fuzz1
I guess its not the switch because when i turn the switch to "1" it lights up only the headlights, te rear lights and all the buttons dashboard etc. still not working, so it makes no sense
No , i did not scann for fault codes, i do have Vcds Lite on my laptop, so i will give it a try right now
Ok, i know its hard to guess what mod its made there, im just wanna know at least where can i began ? what i need to check , maybe some wiring or i dont know ...
... or , i knew an old guy, he is better known to make diagnostics on car, finding problems and fixing them, do you preffer i let the work for him ? its more time saving for me ?

Update: i checked via vcds, no errors

[pawl]

hi, you need to check the power supply, I'm sending a diagram, you gave a little bit of information, the type of headlights, Audi has no green light on the board
it is possible what my friend fuzz1 wrote

[fuzz1]

If you don't have experience it's not only time consuming but can be expensive.