Do the tail lights and park lights come on as they should? If so, first look at your bulbs and see if the filament is burned or not. Either way high and low beams 99% of the time will not blow at the same time, especially in both lights at the same time. I'm about 90% sure your head light switch is bad. Has happened to me in multiple Chrysler vehicles, not that this is specific to Chrysler only.