So PinkRosePetal, where are the two connections for the dess module??????? Are they accessed from under the bike, or behind the battery, or under the headlights????
Well writing it down will take longer than actually doing it! But firstly this was a 2014RT and this is how it was but I guess could be different on other years.
I did mine by removing the battery clamp and battery. Took a small mirror to peek up above the battery. I reached in and removed the dess unit by feel, 2 M6 screws, snipped through the cables and removed the unit. It was only afterwards it occurred to me I'd given myself more work than necessary and I didn't actually need to remove the failed unit. Since I wanted the replacement one accessible in case it failed.
The dess unit cables are attached to the frame by a plastic tie but it's difficult to remove that's why I clipped the cable. But, of course, if the old unit is left in place you just have to peek in with a mirror, clip off the cables, bring them down and remove the old connectors and plug in the new ones. The Spyder end cables are plenty long enough to extend down through the battery aperture once disconnected from the old unit on the frame.
I cable tied the replacement unit to the top of the battery clamp. There were no more dess failures on that bike though I carried a spare unit just to prevent ever getting stranded.
Just for info, that replacement dess was a later unit and came from a breakers in the US, $25 Inc postage to the UK. Seemed a worthwhile chance to take and worked out fine.
I now have a later bike but I know that original is still doing fine. I might mention, I don't have big man hands so perhaps it was easier for me!
I reckon your best bet is to remove the battery cover, 2 minutes, get a mirror and a torch and have a look at what you see. If you make sense of it, go ahead, if not, do it the long way.