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Does anyone have any clues about how modules talk to each other and decide to go to sleep? Even if I can't fix this thing myself, I'm keen to know how it works. Is this even on the right track ??

Hi all, I've got a 2004 A3 2.0FSI with a recurring 'insrument-cluster flickering' problem. Whenever I open the driver's door, the clock and trip meter light up and, after about 30 seconds, they go out. All normal so far. Straight after that, the speedo, tacho and cluster warning lights start...