Hello to all forum,
I'm asking here some information about my problem.

I've buyed on ebay a 46 navi system (from different sellers) and when I connect it all seems to works except the navi monitor, that when I power on the ignition it becomes all white.

The system has:
- monitor 4:3
- MK4 (04/2003)
- radio BM54 (04/2005)
- cable (not original but good working)

When I power on the key the monitor become all white. I can press the power button (the left one) on the monitor and I can hear radio, manual scan frequences, switch FM/AM, change stations 1-6. However the monitor still remain white.

The cable's vendor says me that the problem is the MK4. It's coded to work wit navi-radio, the ones with little monocromatic display with signs and arrow.

Can be the reason of my problem? Is possible to re-code the MK4 using BMW dealer strumentation? Does MK4 have the video-hardware inside? On the back has the blue and the dark-rose connectors. I also have a TV module (without antenna cable), can I connect only the blue connector to TV module and try to see if on the monitor the image changes?

I report here the codes I can find on the MK4 labels:

6590 6 920 182-03
108788 10
FRANCE

04-03 CE

22SY588/23
9022 015 88239
FD00 0015564

HW:1.01/SW1.2

9022 015 88239 00
004 0315 0015564

INDUS VDO: 0123456789
PROD No: FD0003150015564

RadiSys
MICROWARE
DIstributed under license
MIPS OS-9 + Net
3894716

Many many thanks
Massimo