Mines a 2010... On the center console between the front seats is the ride height selector, a rocker button with an indicator to the left of it, there are three selections, high (rock crawling, extra clearance) ride height ( the middle line) and low (access height) you can lock it in access height if you hold the down button, the padlock will light up... any time you change your suspension height the display in the instrument panel will tell you, all the doors have to be closed for it to adjust. Unless you are locked into access height (low) the suspension will revert back to ride height at a certain speed (not sure what that is)
Hope this helps...