Last year my GM5 started going out with the hot weather. As it got hotter it (the door locks) got worse. The site of the vendor I sent it to for repair noted hot/cold weather can cause the door issue to get worse. When I finally pulled the GM5 the passenger door would no longer unlock.
The GM5 is a small computer which controls the locks and a few other things on the car. The GM5 is tied into main computer. I'm guessing (and only guessing) that the main computer may also be affected by cold/hot temp's if they are starting to fail.
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