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As i said in the title, my 16:9 head unit screen in a 2002 BMW 525i is not working. The backlight is on but there is no display. The radio, volume etc still works but i cant get the screen to work. I think its worthy to mention that the MKIII (i think it would be this one) navigation unit (located in the boot) is not there since i bought the vehicle used. I have a feeling that it doesn't work because the MKIII Nav Unit is not there but i want to be 100% sure.
 

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If you're saying you just recently bought a new 2002 525i and asking if the missing NAV Unit in the trunk would cause a no video issue, then yes.

And for some even if the MKIII is present you can have a no video issue too:

https://www.google.com/search?client=firefox-b-1-d&q=bmw+mkiii++no+display

But in your case, you won't know until you connect a MK computer to the display b/c it needs that to boot the OS
 
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