Problem with my automatic door lock/unlock '08 Lacrosse

[Dex23851]

Yesterday all of my door locks except drivers door failed to unlock when I stopped and put it in Park. My key FOB only works the drivers door now, sometimes. The unlock/lock switch inside the car on the drivers door panel, now only unlocks the trunk. The Key FOB was tested has a new battery and is transmitting on all functions. I wouldn't think all of the individual door actuators would go bad at the same time.
Any ideas on what I should check?

 

[richardnewton]

One possibility is that the driver's side window switches got wet and are corroding now. That was a popular failure on older cars of this type. We went to the junkyard a few times to find replacements and most of the cars had corroded switches.

They weren't really cleanable so replacement used/new was a popular option.

Pop out the module and inspect for green and white corrosion.

 

[Dex23851]

Thanks, I thought about that. I believe I found a couple issues, first, all the actuators probably need to be oil/lubed etc.., second, I reset all my door locks to factory settings by using the DIC (Driver Information Center). I disconnected my battery for about 30 minutes, cleaned terminals, replaced my remote keyless entry and door lock/trunk fuses with new fuses, reconnected battery, started of the car, let it run for about 10 minutes, then went through the DIC procedures. Seems to have started working correctly after about 15 minutes on letting the car run and all the programs reset themselves. Just wondering if the ambient temperature outside being over 100° for a week knock everything out of whack.

 

[oldcarowner]

Thanks, I thought about that. I believe I found a couple issues, first, all the actuators probably need to be oil/lubed etc.., second, I reset all my door locks to factory settings by using the DIC (Driver Information Center). I disconnected my battery for about 30 minutes, cleaned terminals, replaced my remote keyless entry and door lock/trunk fuses with new fuses, reconnected battery, started of the car, let it run for about 10 minutes, then went through the DIC procedures. Seems to have started working correctly after about 15 minutes on letting the car run and all the programs reset themselves. Just wondering if the ambient temperature outside being over 100° for a week knock everything out of whack.

Quick note. My auto door locks started acting up a few years ago. First one, then another then another. There was no problem in the winter but in the summer (Texas) they wouldn't work. So you might be on to something with the heat.

Before I changed the first one I looked at the signal from the BCM with and oscilloscope. The voltage of the signal was 12 volts but it was a pulse. I can't remember the exact width of the pulse but it was only a couple hundred milliseconds. My person opinion is if the pulse was a couple hundred milliseconds wider the locks would have worked.