UK Car Repair Questions? Ask a Mechanic for Answers ASAP
Remove the disc, disconnect the battery turn the key on (with the battery disconnected) and press the brake pedal for 30 seconds. Turn the key off, reconnect the battery then start the car and wait for the insert nav to show up, then insert the disc. let me know if this works or not.
and this message remains after you insert the nav disc?
Is it possible when the battery was disconnected that there was any arching, or that it was hooked up backwards after that?
I would start by checking all of the fuse, I'm not sure on the specific fuses for this car because it is UK, but there should be radio 1 fuse radio 2 fuse, AM 1 fuse and maybe AM2 fuse.
And is the nav ecu located behind the display or is it under the seat on this one?
You insert the Nav DVD into it.
OK the only other thing I can recommend is that you remove the unit and disconnect it for a couple of hours. While you have it out, if you are able to I would clean the lens on the NAV dvd drive, just in case there was any dust or debris on the lens.