Now: for some strange reason, the previous owner has been tampering with the plip key reciever. Possibly due to an uncooperative alarm (VDO) which has a tendency of going off every time i open the door. (Unlocking does not disarm it). The siren isnt working so im not waking up the neighbourhood, and the alarm can be disarmed with a button next to the steering wheel.
However, i really would like the plip key to work. Here's a picture of what's left inside the hole (the cover is gone). My mate who used to own a Xantia clames there's nothing missing but i am not so sure.

Anyone?