Using other OEM headunits?

[Elwe2k]

I believe it is. I was looking for some Scion OEM head units to swap into my Echo and it seems they share some main plugs with the Toyota ones, other cables must be purchased in order to get the most out of those stereos, like the iPhone cable for example, not to mention that particular one from the FR-S is a great option because it has pre-amp RCAs (front, rear and Subwoofer).

I looking for this one though. Has BT connectivity, HD radio, CD player and even pre-amp for a subwoofer. And with some aftermarket cables you can use the AUX function, mic for hands-free calls and iPhone mode. Can be found on eBay for ~70 bucks and even cheaper on OfferUp.