Pull the radio out. I'm not going into detail on how to do that, it has already been covered. Here we see the double DIN radio wiring harness. You will be pulling 2 wires out, they are T16/12 (ground) and T16/15 (30 terminal). You will be putting back in 3 wires into this terminal housing. The blank space in the lower left there will house a green terminal housing shown later. The blue terminal housing is the CD wiring harness.