Thanks Geralt,
I'll try the fuses first and then try to work out how to get the centre consul out. I've been watching a video about this that involves undoing the gear shift and then pressing something inside the lower key/ashtray. The problem with the video is that it doesn't show exactly where to press or push inside the tray. Looking inside the tray, there are no obvious buttons, screw heads etc.
I had considered the loose cable theory, especially after the system woke up after the heavy winds rocked アビー on the campsite. In one way I'm hoping this is the problem. At the end of the day I'm not worried about getting the DvD player to work, its more about the Reversing camera which I've come to rely on.