diagram needed for alarm on 1985 porsche 944 early

My Son just bought a mint 1985 porsche 944 and the factory alarm apears not to be working.  The car also did not have the keys for the alarm.

I did manage to get a new alarm switch with two keys.

Now I want to troubleshoot the alarm circut and a diagram would be real helpful.

I believe the alarm relay is in the center console behind the radio/cd player.

Any information would be helpful

thanks

Tom