09/2005 - the date when BMW I/K-Bus radios and CD changers got the MP3 functionality
Two other things:
- I was previously pretty careless despite checking AUX-in adapter few times. This weekend I checked again the wiring of my home made AUX in input and found the fault. I soldered wrong pins of resistor and capacitor together the way one of the capx blocked Left-to-Right pins connection and that is why no AUX IN adapter was detected.
NOW IT WORKS PERFECT!
Button "CD 1" selects the lowest sensitivity (lowest volume), button "CD 6" selects the highes sensitivity (highest volume at the same volume of input signal) to the input signal.
- During search for newer BM54 radio I noticed this information. The say is that all radio versions have the same hardware, they just differ by support for various features based on radio firmware fitted. So to have MP3 support at Your BM54 radio You just need to reflash main 29F400 program memory IC (and if it is not working then Serial EEPROM and DSP-PROM as well) on radio mainboard. Then, If You have MP3 capable CD changer and Mk4 navigation unit with firmware from CD V27 or newer, You got it!