Check around under the dash on the drivers side.... Most remote start units are a lil black box... You could also find your ignition wire and see if anything is tapped into it. Ive never heard of anything like this happening tho and Im an installer... Although my home stereo has a habbit of turning itself on at full volume in the middle of the night... There is no explination as you have to select the source you want, then power, then the volume(i ALWAYS leave it turned down)... Let us kno what you find!