Follow usual logical sequences. Check for other 'failures to illuminate', then check all fuses likely to feed panel and switch illumination bulbs, either dedicated or subsidiary feeds. But with a car of that age, speculation is likely to focus on the illumination bulb(s) for that cluster. At this stage I would open my Haynes manual to find out how to access those bulbs... Unfortunately, despite my polite suggestion, they don't yet do a manual for the X-Trail! You might have to resort to sweet-talking your Nissan dealer into actually doing a quick job on it. Good luck!