Suggested by Stinzer - 22 May 2009
This has been tested with BMW CD Business (2004+) and BMW Business Radio [cassette] (1999+).
Start with the unit turned Off.
Put the Ignition key into Position 1.
Turn On the radio.
Press and hold the 'm' key for at least 10 seconds until the display changes showing the unit serial number.
Use the '- +' keys to select functions
Use the arrow keys '< >' to change options.
The configuration options available will vary between models and the build year, so you'll need to research what these options actually do to your radio.
To cancel or get out of this test mode, simple switch the radio off and on.
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