The headlights do not shut off automatically and no
alarm sounds to let you know that you left them on.
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2001 Mitsubishi Diamante Question: Automatic headlight shut off does not work.
you have a somewhat difficult situation. function of the auto headlamps on this vehicle is controlled by the instrument cluster module(computer) with some help from the assist module(computer). this does not mean either module is defective. what it means is that it will take a very qualified technician to determine if the modules are receiving the correct commands or if the modules themselves are unable to control the headlight circuit. having said all of this i would think most likely the modules are not receiving correct data therefore do not know to de-energize the headlight relays