There was a post a while back about how the new Nav software (v. 20) enabled dimming of the nav display at night by going to the service menu and adjusting the contrast setting.
My problem is that I am able to access the service menu (by going to "Settings" and then holding down the "Menu" button for appr. 10 seconds), selecting the contrast function and then adjusting the slider from 0, the default setting, to about -3. This appears to change the brightness level for both day and night lighting.
However, whenever I shut the car down and restart it, the contrast setting returns to the default 0 setting. Anyone know how to get around this?
Thanks,
/Rich