Automatic headlight shut off does not work. on 2001 Mitsubishi Diamante

The headlights do not shut off automatically and no
alarm sounds to let you know that you left them on.

Asked by for the 2001 Mitsubishi Diamante
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
1 more answer
Had the same issue with my Diamante. I had to replace my door jamb switch. That lets the car know to shut the headlights off when u open the door. Haven't had any problems since then.
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