Finally got the steering wheel control audio unit to work. What an adventure that turned out to be. I am not alone in thinking it was a plug and play upgrade! Seems like some folks are lucky, others aren't.
Basically, depending on the spec of your car, and perhaps the day of the week it was wired back in Japan, they will either have all the wiring in place for the audio swc unit, or half of it. It *might* be present in any of the 3 harnesses it goes through between your stereo and roll connector in the steering column. Which ones has to be investigated in each situation.
Days of research, PM'ing, Facebooking, Googling, resulted in many dead ends and lots of useless information. I managed to get it all going, thanks to Steve's (sjm69) wiring diagrams, and a photo in his thread on this forum, which showed OEM wiring locations. Also credit to SVXdc across half a dozen forums I came across. Absolute wiring guru. Never spoke, but his wealth of information clarified so much.
Half the battle was trying to find a plug which was simply called B68- when I eventually located it, it was a different size, with different pin layouts and not exactly where I spent most of my time searching for it! Then was simply a matter of running the wires between the back of the headunit and to the plug. I say simply, in hindsight!
I should write up a quick DIY- I have a few photos and a workaround which is easier than trying to splice wires in such a restrictive area.
In other news- Stock steering wheel and (no carbon) steering wheel cruise control + blank panel are now for sale! Perfect condition
Aaaaanyway! Here's some photos for everyone. I know Brunsy wanted to see the SWC's installed. I'm stoked with them- especially now they work too!
So happy to have removed the carbon fibre on the steering wheel trim, I hated it!
...The flash highlights interior trim strangely - First pic is the most accurate colour-wise, due to no flash.
DAMD & Full SWC goodness...