go over to the carnetix website and they have a nice little video explaining the led sequences. this will explain the lockout features and the timing of the light. its a good source to help explain what the p1900 is doing.
here is the link to the video.
http://www.carnetix.com/support.html
scroll down to p1900 and it is listed there. there is also a wiring diagram specifically for the mini
hope this helps