So I had a mare of an evening last night playing with the axle diff locks - or rather only the rear one, as the front one could not be tested because the rear one would not lock!
Selected low range, centre diff locked OK, pressed rear locker button. Button flashes, I drive forward but no confirmation that it has locked in the centre screen - you can just make out the rear diff has two quarter circles that rotate to show it's in the process of engaging. The telltale light was flashing at the same time:
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As an aside why does the centre screen show the front diff symbol when it's the rear diff being locked?
No matter what I did I could get the diff to lock; and then I could get rid of the flashing lights on the telltale screen or the the overhead panel. In the photo above the centre diff lock has been disengaged which should automatically disengage the two axles locks, but my light just kept flashing.
I switched off the engine and killed the centre console and telltale lights, but still the overhead panel flashed. I locked the car, and still it flashed. I also noted that the symbols on the buttons don't seem to match the word above, but then it's sort of ambiguous on the panel where the front and rear of the vehicle are?
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I got back in and drove around weaving from side to side like a touring car driver trying to warm the tyres, still it flashed. I had to drive in a full lock circle for the flashing to stop.