why wont navigation work? on 2001 Acura MDX

screen comes on and is operational when key is in accessory mode

1 answer 2 comments
Accessory and run position in ignition should be hot in either mode. If not working in run position, possible bad ignition switch.
thank you! it's really weird, that it comes on when the car starts, but as soon as I put the car in gear, the screen goes black!
That's different then your post. In gear, black screen, Need to look that up. Do you have a diagnostics menu available to you when system is on? Turn on, then in the following order press and hold the Menu key, Map/Guide key, and Cancel key. Keep them pushed and held for 5 seconds to enter the diagnosis Menu.