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Could be a short in the tail lights.. maybe....
The cruise module has a light blue wire coming from the exterior lights (brake lights), and perhaps something shorts and gives that wire 12v when you turn on the lights... a little water in the bulb plug could do that.
Does it happen ONLY with headlights, or with parking lights, too??
Otherwise, is the headlight switch on the column or on the dash? I forget.
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