Originally Posted by
James1549
It doesn't look like the bulb has anything to do with it. The switch sends a ground to the pump module via the switch.
Clearly, James is right. It is indepedant of the light circuit.
I think the switch for the alarm input is in one of the hinges of the door, tho it could be a second set of contacts in the light switch - tho the diagram IMPLIES it is a separate switch.