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I just installed the Nav TV system myself over the weekend, and ran across a couple of interesting bits of info those of you contemplating purchasing this or installing it may want to know...
1. The most difficult part of the install wasn't the wiring. The connectors they supply and the instructions are adequate. Tip - Use wire couplers instead of soldering. It's cleaner and is actually a better connection than the soldering that's recommended. If you have the right tools the wiring shouldn't take more than 30 minutes. It's only 3 wires you have no splice. The power wire isn't active when the car is shut off, so no worries about getting an unwanted shock.
2. The most difficult part of the install for me was figuring out how and where to mount the TV unit itself. It only has a mounting hole for 5 series systems (so I'm told). I lucked out because I have the glove box changer, so I used the changer location for the unit. I drilled a couple of holes into the box, and used a couple of mounting brackets to hold it in place. The box top on the TV unit comes off fairly easily.
3. Interesting factoid - The X5's "stock" mounting location for the Nav TV unit is actually underneath the spare tire, in back of the battery, next to the navigation "brain" (if you bought your X5 with the TV unit stock, that's where it's located). To get to this location, you'll have to read the manual on how to gain access to the battery. This is a tedious task, and the company that sells Nav-TV doesn't give you a harness long enough, so it would require some of your own wiring to mount it here. It's best to mount it close to the Nav CD piece if you can. The other problem is in the US that location is used for the BMW phone module, so keep that in mind if you're really needing to use that space.
BTW, I have the standard 4:3 Nav screen, and it works great. I know a lot of folks have the widescreen units now, but the standard screen works fine as well.
- Tony