We went to a drive-in movie tonight and had to keep the vehicle in ACC to run the audio through the radio at the drive in movie theater. Yes, I know drive in movies are not all too common these days, and surely the vehicle wasn't designed with them in mind. However, my question is this: HOW ON EARTH can you turn off the navigation screen and keep the radio running?

I had a Suburban before and a Cadillac SRX, both of which had this capability. I could not for the life of me figure it out tonight with the '08 Town and Country. So, I left the screen at its lowest brightness setting and put it on screen saver mode which left it fairly dark with the time in the middle of the screen. Nevertheless, I still needed a jump to get the car started when trying to leave. Any suggestions????