Yup did that but it never showed lol. tried over 10 starts.
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The large white triangle with the exclamation mark is a warning symbol for low-level stuff - ignition is on, door is open, steering lock, key in range etc. So not a major issue - I'm confused as to how it's only there for an instant? Maybe it's just a system check?
You should be able to cycle through the warnings with the indicator stalk and see whatever is still active. But if it's not an active warning at that point, it won't show.
Cheers,
Gordon