I have a 1997 RAV4 w/manual transmission with 130,000 miles. I live in Boise, Idaho, so it does get cold in the winter. I have owned my RAV for about 6 years. Every winter I have a problem with the door locks freezing up, usually after a storm and when the temperature dips well below freezing. I don't have a garage, so my car sits in my driveway. It does get driven every day. I also have an after-market key-less door lock. When it "freezes" up, my remote won't unlock it, and I can't unlock it with my key. Previously I was able to get into my car through the rear tailgate. Believe me, at age 65 and of large size, climbing over two sets of bucket seats and a stick shift on a cold winter morning is both uncomfortable and undignified. When I do finally get in the car, I still can't unlock the doors. I have to start the car and let it warm up before I can unlock the other doors. Last winter my son used some lock lube on the door locks and I didn't have a problem the rest of the winter. This year, the very first cold night after a storm, the whole car was frozen and I couldn't even get in the back. Toyota suggested I just get a new key made, but I have a 2nd key that has rarely been used and it didn't work either. I have had the keyless system checked out several times. My mechanic said he could take the driver's side door apart and rework the lock, but I don't really want to pay for exploratory surgery. I would feel better about it if someone actually knew why it does this. I don't know if it is literally freezing because moisture is in the lock mechanism, or it simply won't work because is it worn and the cold makes it worse.