Harman Kardon (Becker) Professional
Along with Business CD units, BMW offered also high-end Professional line available with complex E46 radio Harman Kardon sound system. It was Harman/Kardon (Becker) unit which offers completely different level of sound quality, but after all this years, it occured to be faulty, especially display.
What is wrong with the display? It just “burns out” which means blank lines or inactive pixels. Of course you can fixed it, but it will cost.
Other and quite bizzare frequent fault is… cracked front panel, usually at the left side of the display. I have no idea what’s the issue, but probably weight of the radio is bit too much for the metal construction inside. It could cause too strong tension for the panel.
Besides these faults, E46 radio Harman Kardon was and still is very good sounding gear, but only for Audio CDs. No MP3, no AUX whatsoever. Love it or leave it.