If when the motor is Running(or maybe the ignition just needs to be in the Full "On" position) I stop the car open the door and continue to press the brake, I hear a very faint "buzz". Letting off the brake ceases the "buzz" Its the same buzz as when the keys are left in the ignition/lights are on only softer. Anyone had this problem? Whats the part/ Part# I need to correct this. I have this problem on both cars.