I replaced the bm53 with a module that works. No difference. The replacement nav/head unit works with nav. The radio stations appear and the orange light comes on when i push the volume control. I checked the glove box fuse no 7 but if that was blown i wouldn’t have any nav. This new head unit is a US unit. Does anyone know if I have to code anything for the radio to get the sound to work?

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2005 X5 4.4i M Sport
2003 X5 4.4i