I don't have my 1500 any more, but based on your picture; when the lid is closed the loop in the lid pushes down on the raised part of the lock. As I recall, when that happens, the other part of the latch is released to grab the loop part in the lid. If the loop part in the lid does not protrude far enough into the latching mechanism, it won't release lock. You might take a small screw driver and push down on the raised latach and see if that releases the other latch in the trunk. (Can someone with a 1500 check out that theory?) Also, I think the other side of the trunk has a similar mechanism, you might check and see if they look and operate the same.I have a '98 GL1500 and the trunk will not latch down.
I'm new to the goldwing thing and don't even know where to start looking. Any help would be greatly appreciated. Thanks