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Is it "boot open" warning or "bonnet open" warning?
From your writing, seems it is the bonnet. The switch is near the right hinge of the bonnet.
Position:
The switch:
You unplug the wires connected to the switch (from underneath), not shorten.
so the whole switch had fallen out and was dangling in the grill area didn't work when reinserted but as you said unplugging the switch work
thanks very much