I've found that the key fob does something useful after all, but it doesn't last, and it doesn't lock or unlock anything. Even when I've stopped the alrm by pushing the button it goes off again when I open the door again, and it doesn't matter which button I pushed last. I'm hoping it hasn't set off the immobiliser, or I am screwed for the weekend meet.
Alarm problem sorted, no idea why the need to use the key fob has started after months of not needing it.
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