[AVEO 5 LS 2008] Central locking problem: locks and unlocks again

Well, the title says it all. A couple of days ago, I realized that my car was unlocked and I found it odd, so I remembered to lock it. Then I locked it again with the FOB and it locked, but then it unlocked again like a loop. I checked if there was an open door, but all doors were properly closed. I didn’t find any related issue on the Internet (found many problems with central locking, but none of them were exactly the same or with the same cause, I think). Symptoms:

  • Door locks and unlocks if I press the FOB lock button.
  • Does the same if I use the key manually (both keys).
  • It locks without problem if I unplug the central locking fuse.
  • I can’t press the door lock down if the door is open (not sure if it is supposed to be like that, to be honest). But I can do it on the other doors.
  • I can press the door lock down with the door locked. However, all the doors lock (ok) and unlock again.

I already did:

  • Disconnected the battery for 30 minutes.
  • Checked the fuses (they’re ok).
  • Disconnected the door lock actuator and cleaned the connection with contact spray.
  • Used WD-40 (because… why not?)

(This is the front left door/driver’s door).

I could be wrong, but I thought I saw someone say that if the fob batteries are going dead, it’ll do that so you don’t lock yourself out.

Makes sense. I just didn’t think it was that because it has the same behavior with the spare keys (simple keys without buttons). I read it somewhere too, thanks for the input, I’ll give it a try!

Also, sometimes the door lock actuator can get stuck or malfunction. Have you thought about replacing it?

Sounds like a wiring issue too. Might be worth checking the connections for any corrosion.

Sometimes resetting the system can help. Did you try that after reconnecting the battery?