Yup, it's as I suspected. The button dimming is working the opposite of the dimmer line (at least in my case).

On AC power with no dimmer line connected, it's dimmed the buttons.

In the car with the dimmer line connected and my headlights turned ON, it runs at full brightness.

In the car with the dimmer line connected and my headlights OFF, it runs at the dimmed brightness.


Since the player has no way of knowing whether the headlight line goes low or goes high when I flip my headlight switch (different cars do it differently), it simply remembers the two different states and stores them in the "dimmer" area of flash. One value for high, one value for low. So is Hijack trying to detect which is which? If it were me doing the coding, I'd read those to flash values, and when the headlight-line's state changes, then behave depending on which flash value is greater than the other.