2003 X5 prewired for Nav?
 

I just bought a 2003 X5 4.4L fully loaded, less the navigation option and I would like to add it. I was wondering if those cars are prewired or I will have to buy the wiring harness too?
Thanks

Unless the vehicle came from the factory with nav then it doesn't have the necessary wiring harness for it. It can be retrofitted, but is a complex job. See this article for an example of what is involved - http://www.xoutpost.com/showarticle-58.html

:welcome: to X5world :D