Hello There:
I have the Clifford alarm system in my 1987 944n/a, so I am not sure if this will be applicable to your application.
However, basically the alarm system is armed via a switch located in the driver's side door, behind the latch. When armed, via key, the alarm module which is located near the ECU/DME brain under the passenger side floor board, will sense any intrusion. For example, my car has a switch located in the engine compartment, driver's side, near the fuse box on the frame. If the engine hood is opened, the switch is open and circuit then is hot, the alarm module cuts power to the ignition switch via the DME relay, which also cuts power to the fuel pump and sends power to an alarm horn which is very loud! The car is then in a mode where it will NOT start, until of course the switch is de-activated via the key.
Same process if someone tries to open a door or the hatch in the rear.
That is the basic outline of how the system protects your vehicle.
Hope this helps.
Do you have access to the Porsche Factory workshop/maintenance manuals? If so, there are several explicit electrical diagrams showing the route each switch/wiring takes through out the vehicle. Pretty cool how it was designed originally.
www.clarks-garage.com has a procedure for by-pass if needed.