A friend has change a Concert-III to RNS-E but the first one does not use K-Line (probably has CAN diagnostic). Anybody can take a look at Elsa and tell us the clima pin-out (A4-B7) to get the K.Line from there?
There is not Concert III, it's a Concert II+. And the Audi head unit are conneted to the L or K2 line in OBD T16/15, not to the K line that goes to various other devices. Not that it makes much difference but if you have to many devices connected to the K-line, communication will not be as stable anymore.