Hello, so slowly I am in despair. According to Volvo, the rear PDC is supposed to dim the volume of the radio as soon as an obstacle is detected when driving backwards. Mine also does so. But: In order for the volume to be dimmed automatically, I have to turn up the volume of my radio at least half the volume of my XC90 beforehand. Underneath this, the volume of my PDC is no longer dimmed. The problem is that if I have turned up the volume of my premium sounds + subwoofer about 25-30% of the possible volume, I don’t hear the first beeps sounds of the PDC at all. My friend has tested all possible XC90s, which all have the same problem and pass this on to Volvo – so far with the success that the fourth Volvo-Fräulein has called me and has explained that the volume is not quieter with inserting the R-Gange. Could the XC90-drivers have the same problem and pass this on to Volvo – so far with the success that the fourth Volvo-Fräulein has called me now and that the volume is quite independent of me, if you want to say that your radio.