I don't understand when the 3rd brake light in the spoiler is supposed to come on. I have an AP2 75D and I've seen the spoiler light up when pressing the brakes a few times. I've also confirmed that the X avatar in the dashboard display mirrors the times when the light is on, so it definitely knows the light isn't coming on. I've tried to get it lit with headlights in Off, On, and Auto and with every combination of the front/rear fog lights. What is your experience with the spoiler brake light?