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If you are using the ground in the Scion's harness, you shouldn't. Ground it to the chassis. I can't say that it is the problem but it sure could be... https://www.scionlife.com/forums/general-tech-diy-1821/noise-free-audio-tips-47336/

Does the hiss get louder with HU volume? If so, look to the ground from the HU, maybe add another one or improve where it is grounded. The car's wiring harness may not be sufficient ground so you should ground the HU to the chassis and as near to the HU as you can.

Nice! Can't wait for the rest of the tests.

Dat's one ugly dude!! First up in our 3-part series of Korean 3000-3500 watt amps are the Crescendo BC3500D and DC Audio 3.5k. We compare these amps for a specific reason and you'll see what I'm referring to in the video. I decided to split up the 5 amps into 3 different test videos. The Crescendo and DC are together in one test, secondly, I'll show the Skar SKv2-3500 and last, but not least, the Orion HCCA vs Sundown SCV. As you can see, this video alone is 20 minutes, one of my longest videos to date. I wanted to take time explaining the amplifiers more, thus the longer video.