I have a Kenwood SatNav in my 2011 Forester Xsn. A recent service and repair at my local Subaru Dealer required battery disconnection . After completing the repair and reconnecting the battery, the SatNav screen went black with a message saying,” Please replace the Map DVD”. However, the map DVD was already in the slot and system could not read it. They struggled for an hour to release the DVD, but eventually gave up. They told me that they suspected the unit was faulty and would have to be sent away.
I took the car home and did a bit of research on the internet. I discovered that even though the screen is black, the tilt mechanism will still work and expose the DVD slot. If you then press on the top right hand corner of the screen, the DVD pops out. Next, you reload it and the system boots up normally. I suppose the lesson is to remove the DVD before you disconnect the battery.
One other point, I had a non Subaru map DVD in the slot (the Subaru updates are way too expensive). When the system rebooted, I lost the safety grid on the reversing camera. I suspected that this bit of software was missing from the new map DVD, so I rebooted again with the original Subaru map DVD and, hey presto got the grid back.
I hope that this information may be helpful to others with the Kenwood Satellite Navigation System.