There is one thing you can try. Do you have it "locked" in the "up" position? If not, press the button until the wing goes up and locks (you should hear a beep).

Drive around with it locked in the 'up' position and see if that changes the light's mode. If that clears it, lower it and put it in auto mode and see if the light comes back.
These tests may tells us something about what the BCM thinks is wrong.