I've seen similar issues but nothing quite exactly like mine. My 03' Land Cruiser which was my late fathers has had a bad Nav unit since I got it. The screen LCD is still functioning as I can see the "AUDIO OFF" message when the volume knob is pressed. The buttons controlling the navigation and AC however, do not work. I am not even sure that they are getting power as no green light comes on when those applicable are pressed. I have checked all the fuses, new battery and alternator within the past month. I know my father had mentioned this issue started after a jump start, or whenever he put a new battery in (I can't remember which exactly).
I've tried everything and spent forever looking for solutions online, and this is the only link I found describing my problem (which didn't have much as far as solutions go)
(Note: Radio is functioning perfectly)
I've tried everything and spent forever looking for solutions online, and this is the only link I found describing my problem (which didn't have much as far as solutions go)
(Note: Radio is functioning perfectly)