just a thought, could it possibly be that you are locking the car when its light out and the car remembers that. then when u unlock at night it thinks that its still light out? i know ive read some things about the car "remembering" certain settings when the car is shut off. maybe this is one of them!
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2010 ABM 2SS/RS, A6, home Dec 10th, wifes birthday present!
2007 GMC Yukon XL, 2000 S10 Xtreme, 1969 Chevelle