I'm about certain that you sorted your
problem meanwhile, still I regard it as part of the board's etiquette to post answers.
I can only assume, cause you didn't mention any technical background information about the car, that your XL comes with the small MFD (i.e. no navi/ no bluetooth), that won't show any pictograms about the car's doors ...
(otherwise you would have all 4 doors as well as hood and trunc displayed in there).
If you only see the indicator, it might as well be
the hood or the trunc not closed firmly, as there are contacts in the locks giving feedback to the central electirc control unit. To check that hood and/or trunc are closed, just switch on the associates wipers ... if the wiperarms remain in position, the lid is not correctly closed (hopefully), or the locking mechanism has an issue, which is still cheaper to fix than the replacement of a probably damaged control unit.