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Old 07-21-2014, 01:42 PM
Join Date: Aug 2013
Location: Europe
Posts: 2
kilas is on a distinguished road
Originally Posted by Bombolo View Post
Sorry, but the mk4 is working not this way. The unit has permanent power supply, 12V +-, without ignition. But the unit does not forget the last position not because of the permanent power supply.
After you turn off the ignition, a saving procedure is started. The unit saves the actual datas to non-volatile memory. If there are no IBUS traffic, after the saving procedure the unit goes to sleep, at this point the red LED turns off. If you take out the unit from the car, no matter, the unit remains the saved datas even after 1 year, because the datas are in memory.
The broken mk4 you mentioned, has a defect power part inside, if you turn off the ignition, there are no saving procedure, the unit immediately stops. Therefore you have always the same, previously stored position, destination, settings, what was saved in the past, when the unit worked well.
The unit must wake up if:
- ignition is on, or
- ibus traffic detected (eg. door, trunk opening), or
- eject button is pushed

The ibus traffic monitoring part is defective, so if there are no ignition, and eject button is not pushed, the unit stops without saving tha datas.
My MK4 is not saving user data that I set during the ignition is on. All the settings (favorite destinations, initial position of the car, settings, etc.) left from the previous car owner is in the memory, they reappear after short while the ignition is off even if I erase them, no new settings are saved after few minutes I reignite the car.
Are there any solutions to the problem? Reflashing the navigation unit? changing any part inside the unit? or maybe there is any way to bypass the problem like keeping the unit active during the saving procedure?
Thank you for your answer in advance.
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Old 09-15-2014, 10:40 AM
ccfj1's Avatar
Join Date: Sep 2006
Location: The UK.
Posts: 1,931
ccfj1 is on a distinguished road
Any update on this fault, I have a mk4 with the same problem!!
Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.
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Old 10-04-2014, 12:15 AM
Join Date: Jul 2011
Location: Cambs, England.
Posts: 6
rob-the-viking is on a distinguished road
Ditto John!
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capacitor, ibus, mk4, navigation, power

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