nayone know how to reset the nav drive/brain. tried disconnecting battery for couple of hours to no effect. was in the service menu and accidently hit the US-TAB button. now comes up half engish half japanese asking for the correct disk. have tried inserting both and old and new DVD both OEM. no luck. hoping there is a jumper etc like on a pc motherboard to clear the bios.

 

Hope this helps... there is memory clear in the system check mode.

 

cant get in diagnostic mode. doesn't even complain when no DVD in drive. opened up unit. single board not the dual board that has a reset button. have seen some posts that indicate if you go to a higher rev DVD it will reload. that leaves me with 9.1 which is awful pricey.