In an attempt to diagnose my failing central locking issue, I proceeded to unplug the 41-pin plug from the CAS module, in the hope to test if the signal from the FBD was reaching pin 33 on the CAS. Anyhow, I replaced the plug and when I now turn the ignition on or off (without the engine needed to be started), I hear a brief screeching noise from under the car, not sure where from exactly but sounds like it's from the middle.
I did unplug it a few time, the first few after the car went to sleep, but not on the third time. I think this may have caused this issue. There was an error on DIS, low or no supply to CAS but this has been cleared sucessfully. Anyone have any ideas?