MOD-Please delete.

I did some testing with my multimeter today and I think I have figured out the wiring for the OEM AUX input in the console. The yellow wire is the left (+) the white is right (+) and the blue is the common (-). The other two wires (black and brown) probably are an open circuit that send a signal to the HU to let it know an aux cable is inserted.

This might be useful for those who want to keep AUX input with a compatible aftermarket HU.

I'll keep you posted on my attempts to integrate with my Pioneer HU.

 

https://www.scionlife.com/forums/viewtopic.php?t=194123

 

Thanks. For some reason, that didn't come up in my search. Any new info will be posted in that thread then.