1. Headlight washers - Xenons must have washers as dirt can distort the beam. No washers. No Xenons.
2. Headlight adjustment - You won't have headlight adjustment buttons on your dash because Xenons are self-adjusting. If you have the buttons (next to your dash dimmer and foglight switches) then you don't have Xenons.
Another way to tell is that there is a glass plate over one of the recesses in the headlight unit, it looks like the old style headlight unit where you cannot see inside.