Hi Martin,

thank you for exhaustive answer. Luckily, KRT2's are now being produced and serviced by local company - LX Navigation - and I talked to their technician today. He said that pins 1 and 9 must be separated, because now with the newer version the GND is soldered to the housing of the D15 connector. I bought my KRT2 3 months ago, and also there is no PCB inside the D15 connector on the wiring.
Anyway, tehnician said he is almost positive that its the faulty chip on audio exit and that it can be repaired. I checked with Walter Ditter to see if this would in any way void the warranty and was given a green light to have it checked/repaired by LX Navigation. So on Monday I'm taking it there to have it checked out/fixed.

Thanks again,
Tadej