Lol, yeah could be...
To be fair the interface was already wired in and worked fine with an older Pioneer headunit that was in the car when i bought it. Using the same interface and patch lead in the 5500BT the steering wheel buttons worked but they did the wrong function, it also made the buttons on the headunit change. for example the volume up button became volume down, mute became volume up etc. With their 'later' patch cable, nothing works on the steering wheel, but now the buttons on the headunit work correctly.... I'll speak to incartec and see what they say.