Ello all model year 2011 4.4tdv8, after checking all modules in the rear the front to rear connection, modules under the front passenger seat ect finally traced my most issue to the cd changer by passed this for now, screen all lights up but have no sound at all, on the audio screen it will not change to dab,tv ect either, all was working fine before the most issue, had to walk away , probably something simple, wondering if anyone could shed any light thanks.

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I now have audio, all other functions work apart from the cd changer which I'll get around to changing and programmed in, battery got a little low car turned over slowly then started took it on a run switched the infotainment on and I had audio? I'm assuming it just reset itself due to the voltage being lower than normal, new battery in due course .