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Do your cars have remote start? Looks similar to the remote start wiring when I had my 2010. Remote start wouldn't work if the hood was open, or...
If it's a pull-through, make sure that your hybrid battery is at or near full charge, and turn off all accessories (radio, A/C, etc.) Good Luck.
I think the OP may be referring to the Engine Under Cover (the big piece), not just the splash shield. That being said, I am just using the term...
From your photo, this is a 5a fuse, not 7.5a.
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...and use the mechanical key to lock/unlock the doors.
You'll probably have to remove some of the interior panels in order to install the nozzle and hook up the tube.