Also let us know in which country, as some alarm systems are different by country specs.
I do not live in the USA but in Japan, therefore probably not much of help with regard to after market systems or even your standard system.
In case of after market, do you know the model/type?
Actually, it's not an alarm system but the anti-theft system.
Do you know the code you have to put into the board computer to release the anti-theft block?
After you have opened the door thru the emergency unlock, you have to re-synchronize the system again.
see this link, and try several times, if not working first time.
The 15 minutes waiting are correct.
If you forgot the code number:
remove the battery cable from the battery. No need to remove the seat. In front of the passenger rear seat there is a small plastic cap, remove this, there is a screw (10 mm I guess), remove again, remove the plastic cap under the screw, then you see the battery minus/earth/ground cable. remove that one and battery is disconnected.
After 5 minutes connect battery abain. Ignition to step 1, alarm sound comes, now wait 15 minutes (you can see the counter running on the board computer from 15 to 0 ), then start engine.
During this 15 minutes waiting time you still can input the code, if you found it then. Push code button, push in the code number, push s/r button, start engine.
here you can see where the earth cable can be disconnected.