All electrical connectors on the wing have small little latches on them , you have to find the little end piece (tab) that you usually squeeze to release the latch & pull apart (very tight) at same time. They are a pia, but examine it real close and you should be able to figger it out. I don't have a 18 but have removed the seat on one and it was like the 1800 if I member right.
TIP: MAKE SURE!!! when you put it back together that you get the connector exactly right and TIGHT together!!! or it will not work!!
Hope this helps or someone comes on that has done it a few times. Also when you put it back on, put a dry lube or something on the nylon hooks of the seat so it will be easier next time, same with connectors. & be sure you cover the painted area in front of the seat so you do not scratch it.