On my Ashland, there is an unmarked switch for the step light in the switch panel area, to the right of the main switch panel.
That said, there were some early produced (Q1-2015) Ashlands that were missing the switch altogether. If this ends up being the case on your unit, you will need to have a dealer add this as a warranty item. Not a big job at all - just a nuisance for you.
Let us know what you find out.