I have a 2002 Chevy Tracker Lt and I have a question?
I have a 2002 Chevy Tracker LT and I bought this used and there is no owner's manual and I was looking down at the floor on the drivers side and stepped on the brake pedal there is a black box mounted and a little red light comes on everytime I step on the brake pedal. There is also a knob almost like a volume button that says (Gain) what is this for? Thanks for your help