new user here. Technically I won't be a Prius c owner until tomorrow... I found this camera kit that looks like it should work well and be easy to install, needing no diodes or relays, since it works at 6.5V supplied by the head unit. Toyota Entune/Display Audio Backup Camera Kit - Plug and Play! Has anyone used this camera kit? Any problems? Thanks, Jeff
looks similar to this one: Factory Connect Camera System for 2013 Toyota Prius C with 6.1" Screen | PriusChat
The main difference is that the one you link to is a 12V camera, which means you have to do things (diodes, relay, etc.) to get the head unit to work correctly with the camera. The one I linked is a 5-15V camera and thus can be powered directly from the 6.5V provided by the HU.
See this other thread where I describe the installation process for this camera. Rearview Camera | Page 12 | PriusChat