My central locking is locking and unlocking by itself. I have only noticed this while the engine is running, I don't know if it does this when parked.

The first problem happened after I scraped the ice of the car, with the engine running. When I got back in the car to drive home, the interior light remained on, and dashboard alarm said driver's door was still open. The door was firmly closed, but I re-shut it a few times to no avail. I had to turn off interior light to drive home. When I got home, I could not lock the car (using the remote locking) because the car thought the door was open. I left it in the garage and then checked it a few hours later, and door could now lock. It was -8C that night, but I have used the car in much lower temperatures than this before.

The next morning when driving to work, I heard and could see the central locking locking itself (all doors locked) and then unlock itself again a minute later. The next morning I was locked out of my car momentarily, with the engine running, only for it to open itself again.

Other Symptoms: I can lock and unlock the car with the remote control, but the direction indicators only flash when I unlock it! I am sure they used to flash when I locked it. I cannot lock all doors, when inside the car, by pressing the internal lock above the door latch. This only locks the drivers door – I think this use to lock all doors, but I am not sure.

Any suggestions?