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Similar to Jeppe's, but I didn't want to hijack his thread.  I bought a used cayenne, and the non-Porsche dealer replaced the NAV unit with a OEM one.  The sound was working originally, and they could not get it working after the repair.  I have attached a picture of the error message.  Various methods to reset the system have not had any effect.  I read that it is either a bad component (amp), bad connection, or quite likely a software issue where one or more components need a software update.  I tried following this post http://www.renntech.org/forums/tutorials/article/268-summary-of-pcm21-updates/but it doesn't quite jive with what I'm seeing.  I pressed trip+main and got the attached screen, and I can scroll up and down, but I can't get any more information or sub menus to come up.  I've also attached a picture of the CD that was in the NAV unit.  Any PCM gurus out there that can point me in the right direction?

post-53634-0-81855800-1428614207_thumb.j

post-53634-0-70960900-1428614276_thumb.j

post-53634-0-12811200-1428615220_thumb.j

post-53634-0-87910400-1428859336_thumb.j

post-53634-0-47590400-1428859345_thumb.j

post-53634-0-61990100-1428859352_thumb.j

Edited by ARModen
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There are too  many lazy stupid people in this world.  Took the head unit out and the power connector isn't connected.  Why not?  because someone botched up the connectors and when the amp comes on the radio sounds terrible, so I guess the dealership figured no sound was better than crappy sound.

Edited by ARModen
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