Whoever sells fuses loves me about now….

Here’s what I’ve learned so far:

I'm looking at the REM on the LH side of the cargo compartment. My car has identical relays in RMI slots 15, 17, 18, 19, 20, 21, and 23. If I pull the relay from the RMI-20 slot I stop blowing fuses, but neither rear doors will lock/unlock as commanded. Also, when the relay is removed, activating the lock button on the driver’s door triggers the gas door, and pushing the gas door button triggers the rear door locks – the rear door lock buttons will actually go up and down when this happens. If I re-insert RMI-20, it only blows a fuse during “LOCK” action, not “UNLOCK”, but neither rear door locks will move in either action. Also, the fuse will blow during “LOCK” action regardless of whether I use the key fob or push down on either door’s manual button.

I'm "pretty sure" I swapped relays around in a way that eliminated the relay itself as a likely cause, but I'm starting to doubt my procedure - I may re-verify that.

The rear hatch locks/unlocks properly without blowing a fuse.

Any ideas?