the common positive you refer to is just a regular power for the alarm brain. it runs all the logic chips and any built in relays. it also may use that same source to power the parking lights also.

the door locks work like this, if you have any honda they have (-) negative trigger locks, meaning if you put that wire comming out of the switch to ground, it will activate the door locks. there should be two wires that are negative trigger, the door lock open and the door lock close. the wires comming out of the alarm brain, the trigger wires, run to relays that are in the brain(some alarms have external relays). when you active the alarm to lock, it sends a pulse to the built in relay relay, which puts the trigger wire to ground as long as the relay is active. hope this helps cuz i had a hard time trying to understand what you are asking. visit the12volt.com, its a great resource.