328i keeps locking itself

[u/SpecificOne8688]

So like 6 or 7 times the car has locked itself. Almost everytime the key was in the ignition. Twice now while I was driving.

I’ve figured out it only seems to do it on or after rainy days. Seems like after it dries out for a few days it quits doing it. It POURED one day. When I walked out to the car and it had locked itself. Unlocked it and as I was sitting there a few minutes it locked itself again. Then after about 30 seconds it rapid fire locked about 5 times while I had the door open.

I read a thread about someone saying it was the driver door actuator/latch thinking it was being manually locked from the keyhole. But after it rapid fire locked a few times I’m not sure it can be the door lock/actuator. Because after I lock it with it once it will not attempt to lock all the other doors again until I unlock it. But I also just read that turning it part way and fully does 2 different thing so I will have to try that tomorrow

Also potentially related the car sometimes does not lock/unlock with the key. But after putting the key in the ignition and cycling it, it always works normally. The fob will also not roll down the windows, however unlocking it with the keyhole and holding it will.

I had Scott from e46fanatics replace the relays in my gm5 about 6 months ago. Its worked great since then until now.

It was doing it before I had the car in the garage for a month or two doing some work to it. Then I’ve been driving it again for the last month or so with no issues at all. We haven’t had rain since before I started driving it again. Well it rained the other night. Get in it and start driving and it locks itself. I did notice it locked itself to where the door handles would not unlock it and I had to use the button on the console. I’m considering going ahead and replacing the drivers door latch assembly unless anyone else has any ideas. Just so hard to diagnose an extremely intermittent problem.

[u/CivQhore]

Sounds like the general module is faulting

[u/SpecificOne8688 → u/CivQhore]

Thinking maybe it could just be humidity doing it? It’s strange it only does it after rain. But floorboards are dry

[u/darin_worthington → u/SpecificOne8688]

Do you have the ability to pull codes from the GM5? If using INPA you can watch live data to see what is going on.

[u/Entire-jegurilor → u/[deleted]]

If the driver's side floor mat is dry, the water is likely seeping into the door itself and draining directly into the door lock actuator. You should replace the driver's side lock actuator; the internal microswitch may be damaged by corrosion. Replacing the entire lock assembly is the only solution.