I did that, I took off the negative terminal for about 10 minutes just for the hell of it... and Plugged it back and its still on... Some kinda Weird shit.. After 2 years of driving this car, all of the sudden it came on out of no where... I never wired anything up to it, nor did I wire up a system or amp or anything.. So I know theres no wires touch it or grounded different..