Push and hold the AUD button for a second until you get the special menu, not the normal bass treb bal. You should see the buttons like TEL AUD LCD, LCD is the one you want. Just push it to cycle thru the settings of POS green background black text/ NEG black background green text/ and AUTO this adjust the display based on the headlight switch/dash illumination.

To check the model and software version of your radio, press NAV and the #10 multi function button at the same time. If its not a nav radio then i guess try the upper right last button and #10 at the same time?

Anyway mines an '05 with nav, here is the model # BE 6811 radio software 0410713A.

Hope some of that helps.