Hello Citroen-Kundige, driving for 10 years a C5 Tourer type: 3001 ANZ. In the C5 a radio with Navi RT6 is installed. When the ignition key is turned around the level correction starts to run and after reaching the desired altitude the sound playback switches on normally over the speakers. At the switching moment of the sound playback via loudspeaker one hears a relay from the direction of the dashboard to the right clack. But now it often happens that the clapping of the relay remains The navigation system and the radio work, but there is no sound output. Even the distance sensors indicate on the display, but there is no sound from the speakers. For me, it looks like the relay is not controlled. Restart does not help. The next morning it works properly again. This indicates that a capacity has to be discharged so that the device can start. If someone has any idea, Why the relay reacts so? What can I do? Greetings Charly