i have a 2005 yukon xl with traction control and stability trac awd. on the left side of the instrument panel are 3 buttons. for nornal driving what light should be lit up. for many years the middle button yellow light was always on. recently the middle button yellow light has been switching off automatically and the red N(NEUTRAL) has been coming on(with a cycling of the ignition/start up). the N(NEUTRAL) is between the top and middle button. I read the manual and it does not say which light is on for nornal driving. can someone enlighten me to the correct operating position for the buttons. if the middle button (yellow light on)is not correct than I have been driving for many years in the wrong mode. I stared the car to take a picture of the buttons and the middle light is back on ( this does not make sense) what would cause the lights to automatically switch between N(RED) AND THE middle (yellow light ) button when the engine is turned off and than back on under normal driving conditions.