Today I took the UDZ 2003 car for a test drive with my freshly installed Concert 2 radio.
Before that, what a pain it was to firstly research why the button illumination did not work (yes, the more experienced here will have a clue at once I am sure) and why the radio did not follow key-on and key-on transistions, instead was always on.
The second pain was to do all corrective the work at the car outside in -14C temperature and dark. A lamp on my head at least solved the dark
.
This car was obviously, just as most other sweden-sold Audi A2s, ordered in a configuration for aftermarket radios (code 8YU).
This means that no CAN bus was ever routed to the radio connector C. Actually the connnector C was omitted.
And the K-line was also missing at the radio connector A, since aftermarket radios wont have any use of it.
But, if/when installing a Audi radio, both a CAN bus (either the Infotainment or the Comfort bus) and K-line is needed for the Audi radio.
To cut the story short; in the end I located both of those at the climate panel connectors, and made a add-on harness from there to the radio.
Now both button illumination and key-on / key-off works well on the radio. And of course the radio sounds good.
???