The heat killed the 3.5mm line-in port on my car, it wouldn't sense the cord being plugged in and I had to pull it to one side to get it to work. Fortunately you can pull off the cover and pull out the plug from the front without tearing apart the whole dash. Then I soldered a wire between the sensor pins so it's always "on" (and I just switch audio sources with the buttons on the nav screen.)