Spyderturbo007 is spot on. How the SPIKE system works is that each connector on each Node board shares a common ground that is chained from target to target. In this case, it's Node 11 Connector 5. This is used to drive the following three:
Left Lock Target
Right Lock Target
Demon Entrance Opto
You will find a common wire (most likely Black) that runs to all three of these targets and back to the Node board. If one of the wires break off the target switch, it'll effectively disable any switches past that point.