This morning I got in the car and the park assist was set to off. It was on at 10pm last night so I'm not sure how it got disabled. I cleaned of the sensors to make sure they weren't blocked and I ran through the options but when I get to Park assist how do I turn it on? I pressed the check mark but it still just has lines under the word park assist. I read the manual while doing this but I'm missing something. Help.