Thank you for the reply and the very helpful information.

Yeah the nail in the coffin is that the other nav unit i got seems to have a route pre-programmed and is telling me to take junctions ect- even shows destination info on the dashboard and on the inboard computer on the nav screen.

would a broken wire also cause the screen to flicker/ cut out when its hot aswell or could that possibly be a different issue?

I shall start stripping the boot out this weekend then, you wouldnt have a circuit/ wiring diagram that i could use for continuity tests/ feed tests.

Many Thanks

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2006 E53 X5- Le Mans Special Edition