I have a '05 xA and I'm trying to add an aftermarket stereo to it. Nothing fancy, but the CD player in the original does not work and it does not have Bluetooth, so adding a stereo that does. I ordered a stereo that said it is compatible and I purchased the wiring harnesses. One problem, the Scion compatible harness has 4 wires, two green and two purple, the aftermarket stereo harness has 8 wires, green, purple, white and grey, 2 of each, one with a black stripe, same as the connector harness. Have tried several different variations and cannot get the front speakers to work. Any ideas?