shouldnt I get some type of "low to high" voltage on the "B" pin when I arm/dis-arm or trip the alarm??
I have never tried it, but I would expect to see a logic level change on the "B" pin when the alarm system was tripped to sound. I just don't know for sure if the siren module provides some sort of "pull up" or "pull down" resistor for the process to happen.
This is what I would try....
Looking at my 2009 schematics, Pin "A" is battery+ from the bike and the "C" pin is frame ground. With Pin "B" being logic level trigger. Pin "B" goes to pin 11 of the TSSM. So Pin #11 of the TSSM is the "trigger" for the siren module. Therefore there is a wire which goes from terminal 11 of the TSSM to terminal "B" of the siren module.
Now with the siren module removed, is the logic level of Pin 11 of YOUR TSSM "Low" or "High"?
If it is LOW,, you may want to try taking a 1K ohm resistor and placing it between terminal 11 of the TSSM and battery positive of the bike (with the siren module REMOVED) in order to act as a pull up resistor.
This resistor would look like a "good siren" to the TSSM. Now monitor that terminal to see if the TSSM pulls it's logic level "low" when the alarm is tripped.
This just may give you the answer your looking for. If tripping the alarm does sink the logic level, you know the TSSM is probably good.
Also the opposite should be true as far as the siren module goes. With the siren module in you hand, connect a 12 volt battery across terminals A & C. (pin A is positive and Pin C is negative). You should now be able to force trigger the siren module into an alarm state by either grounding terminal B or applying 12v to terminal "B". (use a 1K resistor to sink or source pin B for safety)
Does your bike flash the turn signals to indicate an alarm condition has taken place. My 2009 does. You need some kind of indicator to tell you an alarm condition is met.