I wrote a long description of how the entire system works, can't find it now.

The switch above the passenger's head closes when you unlatch the top and push it away from the frame -this tells the controller that it is now safe to run the pump, but the divider switch in the trunk also has to be closed. If these two switches are closed, when you hit the button, if the trunk is fully closed, the TCM will lock the trunk and start the pump and off you go....