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Pcm 2.1 compatibly - changing unit for different model number

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Hi, My PCM 2.1 in the 2005 Cayenne is a model number 6663, with the Bose set up and separate dvd drive for sat nav. After a hot day the screen image can be best described as a modern art show, and when you change from pages main to trip to maps to sound etc the text from the different pages stay and overlap on the newly selected page. I’ve been advised by a computer know-all friend the graphics chip solder could be the culprit and reflowing  (“melting it”) to renew the joint could repair it. But it’s fairly impossible to get to! 


I’ve seen another PCM for sale but its model number is a 6635 taken from a 2004. Would anyone know any issues swapping the units? Am I right in presuming all Cayenne’s sat navs would be driven by the separate dvd? Would all models automatically be configured for the Bose fibre optic set up? Or worst case scenario internally they’re built differently and won’t accommodate the fibre optic input. 


Any help greatly appreciated! 


Many thanks,



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A 2004 would be a PCM2.0 so no. You just need to match it with a PCM 2.1 (2005-2008, '06-'08 preferred as they have the phone button and most '05's didn't). If you have Bose and Nav, you need to get one with Bose and Nav. I had a BE6655 and replaced it with a BE6693. My BE6693 is a 17/08 manufactured unit, my Pig is a early '06 CTTS. Options like Sat radio, backup camera, off-road Nav, compass, CD changer are coded into the head unit. So your replacement may have more or less things coded into it when you replace it. I lost my dash compass and off-road Nav but didn't realize it until I was driving home from having the dealer code it for the backup camera. Dealer is 2+hrs away so I never went back.

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You can't retrofit a PCM 2 into a PCM 2.1 unless you want to change out the whole system. It would be a degrade going from DVD drive to CD drive and for maps that haven't been supported in 10yrs.

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