This is the wiring harness for non pre wired 03 Muranos. It came with the unit I bought used, but I installed the unit in my new 04 SE. No harness required in the 04. Even though the sticker on the 03 Murano says that you cannot add satellite Sirius or XM to your factory radio, you can and it's been done by alot of members of this board. This is the cable you need to get factory satellite radio on your 03 Murano as long as you have a sat button on your factory radio. I'll sell it for $40 plus $8 shipping.