identifying car alarm

Hi I recently purchased a 2002 Mercedes CLK convertible to drive arround during the summer. The car is in a decent state and already fixed some minor issues, did some maintenance and fitted modern stereo with bluethooth etc. But the car has a terrible aftermarket alarm system. My plan is to remove it during the winter but I wan't to go systematic with it so I need a wiring diagram. Can anybody identify this alarm system so I can search the web for the diagram A couple of friens of mine already said the owned car's with the same system so it must be from a knwow brand. (they bought second hand so didn't knwo either) The alarm disables with a metal thingy that hangs on the key, you have to touch the blinking led next to the steering wheel to disable the alarm, it also has 2 sensors next to the front window Any help Thank you in advance

Sorry forgot to upload the pictures

Finally got time to look at the alarm system, removed both sensors, and traced the wires, found this little box behin the dash Does annybody knows this box? google didn't find anythig usefull

Defunct Italian manufacturer AFAIK, alarm uses vehicle remote to control it. Probably find that the ultra sonics, above air vent are causing the problem. (Mounted too low, will pick up air movement from those vents). The round object is a Texas RFID chip, either controls a secondary immobiliser or is an alarm over ride.