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Originally Posted by apw2607
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 ...
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Actually with the e46 there are two different nav options. One uses a color screen similar in size to the e53 (X5), and the MkIV for this system is totally interchangeable with the X5. The other, however, is a small monochrome screen and the MkIV for this unit will not work in the X5.
The fact that the later year e46's have a CD unit behind the screen instead of a cassette really doesn't factor into the equation.