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Originally Posted by AdiHH
So a faulty TV/Video Module will disable a MK1 nav unit. Did I understand you correctly?
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What I meant was that hte TV/Video module runs the whole display, and the MKI nav computer acts as a slave to the TV/Video module. Therefore, if the MKI computer dies, the system will continue to work just fine, but the "GPS Navigation" option will simply dissappear from the menu.
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Originally Posted by AdiHH
Yes, I think I will go straight to a MK4, then I can throw away the TV/Vid module (assuming I don't want TV) and remove the old Trimble module and plug the GPS antenna straight into the MK4. I prefer to upgrade in stages, where possible. So I would leave the old 4:3 monitor in place and replace that last of all. I know I need to get a 'conversion harness' to connect the MK4 nav into the I-Bus. Again, am I correct in this?
Maybe later I can change the radio module to a BM54 so I get TMC and other stuff, like MP3 support.
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You have the details exactly right. I did this exact same upgrade to my car. You have to pull the MKI, Trimble module, and TV/Video module. Then, you replace the MKI trunk harness with the MKIII/MKIV harness, and the new MKIII/MKIV stuff will plug right in. You can do the screen later, if you like.
Same with the radio. You can upgrade to a newer BM54 radio and gain those new features. But, you can do the radio any time you want, as it is totally independent of the screen and nav computer.