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.