Sat Nav DVD Drive Stopped Working

[Lexo]

Hoping someone has encountered this issue.  My Centre Console screen is showing the message 'The External System is not Connected' when pressing the Menu/Dest/Map buttons.  Quick Google Search indicates the issue due to faulty Sat Nav ECU (fancy term to Sat Nav DVD Drive).  I've tried ejecting the GPS disc and the DVD drive motor is not moving so I think the DVD drive is fried.  I've checked the fuses under the passenger footwell and there doesn't appear to be a fuse for the Sat Nav drive.  I've also tried disconnecting the 12V battery to reset all systems.  Other than the Sat Nav function, all the other functions seem to be working still.

I've called round a few wreckers and they want to charge $250 for one.