Made it easy
2006 Toyota RAV4
Very concerned about doing this install since I never did one with a steering wheel connector, but once you figure it all out, it's a snap! Had to watch various youtubes, talked to Crutchfield tech support, but the call to Metra answered the question. For my 2006 Rav4, it was simply plugging the 3.5 male into the female 3.5 adapter, and connecting the brown wire from the adapter to the blue yellow of the radio harness. And that was it!
Pros: Simple install once you knew what to do.
Cons: Confusing at first, watched various youtubes, called Crutchfield, but finally after talking to Metra tech support for two minutes got it done.