I haven't installed one on a Titan but I did install on a Frontier. Wiring is simple, - ground, switched DC and constant DC. The mirror kit included a wiring harness. Install the mirror, route the wiring harness under the headliner to the driver's side post. Loosen the trim by removing the handhold on the post and continue routing the wiring down the post and under the dash. Now, all that is necessary is to find sources for switched DC and constant DC - a wiring diagram of your vehicle is very helpful at this point, or you can search using a voltmeter.
also if you are looking at mirrors and your truck doesn't have the homelink (opens a garage door and such) in it already they are a good choice and you can throw the garage door opener away wiring is still simple I just put one in my 350z took like an hour and that is because it was 115 in my garage when I did it:flame:
Just finished installing it, alot easier than I thought it would be. I went with the one they sell for the Altima on Courtesyparts.com. It was alot cheaper that anywhere else, they have $50 discount, paid about $150. Thanks for teh help.