         
Vehicles Equipped with alarm systems 1992-94 Cavalier, Corsica, Beretta, Sun Birds GM service bulletin #438101 suggests that you can check the resistance in the door lock switches. Switches with too much resistance may fool the alarm into thinking the door is open when it is closed, thus keeping the lights on. These vehicles also exhibit slightly ajar rear hatches, which also cause the interior lights to remain on. Source: GM 
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