How to get into the Business CD "service mode":

1. Turn radio off.

2. Turn radio on and immediately press and hold the [m] button until the radio's serial number appears on the display.


Press the "-" button under the "+" on the display to advance to other pages settings.

4. Software version: Display of the radio software version. Displayed as (calender week, year, version) for me is "SV 31-03 40" meaning 31st week of 2003, version 40 (or maybe 4.0).


5. The next page shows "RI 00". No idea what this means.


6. GAL: Speed-sensitive volume control. Can be adjusted from level 1-6 using the 6 pre-set audio buttons. Vehicles equipped with DSP do not use this feature. Mine shows "GAL 2" which matches my Speed Volume setting of "2".


7. Field strength and Quality (F/Q): The station currently displayed can be assessed for field strength and quality. An "F" (i.e. F9) number is used to indicate the strength of the signal being received by the radio. This is a good test of the antenna system, station signal, and the radio itself. A "Q" (i.e. Q13) number is used to determine the quality of the radio station including both the audio and RDS signal if applicable.



8. DSP: This function provides information about whether the vehicle is fitted with DSP. The value is displayed as a "1" (fitted) or "0" (not fitted) and is communicated by the DSP amplifier via the I/K bus. Obviously, I don't ahve DSP.


9. TP Volume: Provides adjustment for traffic report minimum volume. Not used in the US.


10. The next page shows what appears to be the "pixel test" Tom described. Using the "<" and ">" keys as well as buttons 1-4, I could cycle between 4 screens: even pixels, odd pixels, all OFF, and all ON. But no amount of button pressing (such as the "-" and "+" buttons under the volume knob would adjust the brightness. Grrrrrrr!




11. Area: Used to select the appropriate market setting (USA, Canada, Europe, Japan and Oceania). Adjust using the pre-set buttons. Using the "<" and ">" buttons, I cycled through "AREA JPN", "AREA EUROPE", "AREA CANADA" and "AREA OCEANIA". Whatever you do, do NOT select any of these other options or you will lose your stored presets, as I quickly found out, haha.


12. AF: Alternative Frequency tracking setting. Not used in the US. Not sure what this does, but options included "AF AUTO" and "AF AUTOPONI" (or something like that). I didn't mess with it to find out.


13. I turned the radio off, and then back on again to exit the service mode.

This concludes the illustrated online service menu.