Yesterday I met a new problem. It is an MK4, it has no nav voice. If I replace the unit to another mk4, it works perfect, so the wriring is good (it is an E46 touring with 16:9 nav, originally, factory made with nav). If I put the dumb mk4 to another car, it has no voice even there. So the mk4 is faulty. I thought it is maybe software failure (it was sw version 4-1-40), I upgraded it to V31, the upgrade was successful, but the voice did not came back.
If I set the nav volume, no voice can be heard, but the volume of the radio is changing in the backround.

Has anybody any idea? Thanks in advance,