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Here for reference as it may helpothers in the future. I have a 03 Vogue with the Mk3 Sat Nav.

I have recently replaced the battery as it was past its sell by date and throwing various errors up then failing to start the car.

I had the battery replaced by a local reliable source however since fitting over a couple of days the Sat Nav display and computer screen has blacked out from start up. Ocassionally flicking on then disapearing and blacking out. I little fettling of the ignition key a couple of times and the basic computer display came up which is a bright blue background (you will know it if you see it!) and the display was minus the DSP and Sat Nav options. Also the CD player would stop suddenly mid song.

I opened the boot (trunk for those on the dark side of the pond) and noticed a wet patch.. this was a red herring initially though I suspect my be the source of the problem. The Sat nav unit power would not light up. I removed it unlogged it and replaced but still no joy. Research here tended to suggest either water in the sat nav or low power due to the battery and the ibus system the cars wiring uses.

Initially I deffed out the power and thought the water was the culprit however I did as a belt and braces exercise try the battery with another fully charged battery piggy backed. I then tried the ignition and the computer , sat nav , dsp, and cd all fired up as they should.

I think the point here is not to assume any new battery is fully charged and may present problems that could cost owners to be checked when a simple recharge of even a new battery is all that is required. I have had the battery on charge all day and a trip out just as revealed the gremlins appear to have jumped ship.

I'll post a seperate similar thread regards the leak in the boot / trunk as that is a seperate issue.

Hope this helps others when searching. :D
 

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Interesting my MK3 Nav died recently but the battery also bit the dust recently too. I replaced my MK3 with a MK4 maybe I will plug the MK3 back in to see if it works with the new battery I installed.
 

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Battery voltage spikes can kill the mkiii nav drives. They are very susceptible to voltage spikes.

Here is a good doc on the battery and the entertainment bus of the RR -ibus This bus system operates on voltage changes
http://www.e38.org/bussystem.pdf

If you are interested in reading this stuff, that above link is helpful. Upgrading to the mkiv addresses the issue of the failed mkiii nav drive. Plus the mkiv does not have the same issue with voltage spikes.
 
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