I've installed the pioneer avic z2, and so far it's been nothing but headaches, I have it in so far and it looks great and works great. However, trying to get the PAC SWI-PS interface to work with my existing steering wheel controls and I need to locate, according to the PAC website, a white/red/yellow dots wire to tap into. I've tapped into Z2's 12v power source, and I grounded the black wire to a screw against a metal/grounded surface. But the yellow wire has to be connected to the wire mentioned above and I've already tried the one next to the steering wheel, the area right above the clutc