BMW alarmsystem, can I fit a aftermarket keyless system?

[Espen]

Ok here`sthe deal.

Im trying to work out some problems located in my central lockin system / double locking, in this Thread

I removed the back seat now, and found out that i allready have a keyless system.. It was not connected though. a big black bmw marked box with an antenna on. It was marked "GEMEL ITALY" The product number on it was 82929402527, I googled it and RealOEM.COM says it is an "Control Unit Alarm System" It is obviously not working, its full av scratches and screwdrivermarks. (someone have opened it and played around) And I dont have the remotes for it.

Here is the 1 millon$ question, who can find the drawing for the wiring to this box, i think i can connect my aftermarket keyless system to the alarm units wires.. At least some of them..?
I need to figure out wich wires that sends the lock unlock and doublelock signals.. I can post pictures of the box and its connectors later, just need to get home from work.