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Originally Posted by r207
ok guys need a bit of help, i have all of the bits for a nav retrofit sitting here in front of me. what i need to know is what do i need to ask the dealer to CODE, also can this be coded before the car has the nav in it or do i need to do this after i put the nav in,
also what does the coding do????
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Ask the dealer to perform the Professional Nav retrofit coding after you've done the full install. This will update the Mk4 with the VIN and various other settings specific to the X3. However, Kiwikochen's navcoder tool will allow you to do this yourself for free provided you can get hold of an ibus interface. See navforum for more details.
Retrofit coding at a dealer has the advantage of checking the software levels of all the related modules - radio, cluster, bluetooth and will bring all of them up to the latest levels. This is no more than 1 hours work for a dealer with the right daignostic / coding tools. Dealer coding also updates BMW's database to show you've corrctly fitted the sat nav option for future diagnostic / repair work.
Mk4 navcomputers default to European mode and 7 series spec. THis will work fine in the X3. My used Mk4 worked first time, but if you want everything to be same as factory fit, get a retrofit coding done by BMW.