polzky

Hi, ive just experienced weird issue with sat nav in my 2004 a8. sat nav was working fine and was updated with new maps. after period maybe 3 - 4 weeks i wanted to use it and navi button appears to be dead, no light, no sat nav screen on mmi. Checked with vcds and navigation ecu is accessible, no errors stored, also most ring test shows that all components (including navigation) are ok. Tried to search forums and googling for similar issue couple of days but wound nothing related. I kinda doubt that button would totally die if not used for few weeks so if anyone have any suggestions where to look for the problem i would really appreciate any help and advice. Thanks

the_duke

I'm betting on a physical problem with the button on the MMI pad. I would try taking it apart and cleaning it.

polzky

Thanks, Ill try that tomorrow. Are the buttons interchangeable? i mean can i swap the buttons with info which I dont use at all?

MP4.2+6.0

+1 Clean. Buttons just push on circuit board underneath, so swapping irrelevant even if you could do it.

polzky

Thanks for the advice, i really aporeciate your help

mishar

+2

Just try first MMI reset.

polzky

Hi, tried to reset MMI, had centre console out, checked rbe switch with multimeter but was ok, for peace of mid ice just desoldered it and replaced with new one. Still no luck, navigation button wont light up and sat nac wont turn on

MP4.2+6.0

No new ideas other than rescan and then just replace board if no errors come up pointing elsewhere.

polzky

Update: when access through Names button and then choose Navigate (destinations are stored) sat nav is starting up and working fine. Guess its console board replacement.. Thanks for all the help and advice

polzky

Update:
Had some time to take out the console, checked PCB with multimeter and found burned out track from the navigation switch. Soldered a wire between points where the track was burned out (there was marks of liquid spillage which caused damage) and now NAVI button works as it should.