You will need two wire harness. One is of course the one needed to plug and play for your new cd player, the other is a reverse harness. Its designed to plug into your stock head unit. Wire up the harness for the cd player, and tap into the the power wires (red, yellow and black.) Only hook these three up and tape off the rest of the wires, and plug in the green harness which works the keyless entry, as well as your dome light circuit. Pull out the center console and cup holder, you will have plenty of room to hide it back there. If you have the oem cd player down there, you will need to buy a little pocket because it's not as deep, if that's not a choice, then just extend these wires until you find a good place to hide it, this isn't too recommended since you'll have to extend the wires of the green plug as well, more work to do. This way you don't lose keyless entry and still have a better cd player. Hope I helped