Hmm, have Pioneer AVH-A205BT HU.
There are two SWC control options available - with adaptor and no adaptor. With 'no adaptor', it asks if it is Jap or Korean, I chose Jap, then goes through a setup menu, where you select function and hold key for 1 sec. As I don't have any keys to press yet, I tried the other setup - with adaptor. It took a few seconds to think, and then said it was set up.
Anyone know which setting puts it in the mode we are describing here?