[vljenewein]

Here is the details: 1993 Park Avenue Ultra with remote key fobs.
This is what happens: In the summer when it's warm I get in start up the car and pull it our of park and door lock. I put it back into park and doors unlock. Key fob remotes work as normal. Press unlock once and drivers door unlocks. Press again and all door unlock. Trunk opens as it should with fob or with dash switch. All seems normal and happy.

Now comes fall. Cooler temperatures. Get up in the morning, temps now in the low 40's. Start car, and when you pull it of park into gear, no doors lock. Key fobs cease to operate. You put it back into park and no sounds either from trying to lock or unlocks. Turn off engine and remove key. Remotes still don't work. Sometimes if it does happen to lock the doors, then it won't unlock the doors when put into park. Wait about 30 seconds, hear a slight "ting-ting, ting-ting, ting-ting" and often the door remote locks will work. Unlock and lock, trunk also opens if pressed.

I've replaced the Body Control Module, and the door lock control module ( the one thing with about 8 or so wires running to it that you can hear and feel 'operate' when you lock/unlock the doors). It's under the right side dash kick panel, up close to the fuse block.

This only happens when the temperature is cold. Winter is worst. Summer all things work as normal and nothing seems out of place.
Has this ever happened to anyone else out there? If so, what was the cause of this?

Very perplexing problem. Also does the BCM control the rear window defroster? Seems when it's really cold that the rear window defrostere does not work (handy huh??). When the door lock/unlock things are working.. ie when it's warmer, it does work and put voltage through the wires in the back, and defog the rear window. What else does a BCM control??