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My Prius did not come with Navigation originally.
It plugged right into the connector but I don't know if the correct wiring is there.
Not sure if I'm posting this in the right place but I have a 2008 Prius. It didn't come with Nav. I installed a Nav MFD. The Nav doesn't work...
Just pry under the clip with the 2 tabs. It will come up. It might take a little while. Just keep working at it until it comes loose.