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Originally Posted by UCrewX5
Physically, the MkIV should look like the one in this article - http://www.xoutpost.com/articles/all-...ystem-faq.html
The challenge is that the MkIV for the small mono screen (available in the 3-series e46) looks just like the MkIV for the larger color screen found in the X5. So be sure what you buy is for the latter. When hooked up, it should say in the SETTINGS " 4-1/XX", where XX is the OS version number. 4 denotes a MkIV and the 1 denotes the color screen version.
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Note, Both the E46 and E53 now use the large wide screen board monitor. The difference between the two units however is that the E53 has a cassette slot behind the screen and the E46 has a CD slot. The E46 unit will not fit in the E53 dash due to space limitations !!
Depending on what they have ripped out, you are going to need
Board monitor, Board monitor radio (trunk mounted), NAV computer (MK IV will work fine), CD Changer, TV module (note, a Digital/Analog tuner now exists so you can receive Freeview channels, not necessary for NAV functions though)
I would have a look around in the boot/trunk to make sure that the wiring looms are still there. If they aren't there, then it will be like doing a complete fresh NAV retrofit ...