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Blocked rear drain has killed by phone unit

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Hi All,

I found my drivers side front and rear footwells to be soaking wet. Using these forums (thanks!) I realised that I had a blocked rear drain. I successfully cleared this today and the car is slowly drying out. However....

I was getting a fault on the PCM of "System error: CD changer, Phone, Amplifier, Navigation system not available". After a bit more googling I saw that there was the telephone control unit under the drivers seat. I removed this and found it to be quite badly damaged - lots of blown resistors, decayed connections etc. It needs to be replaced.

My question is, can I just buy a new module (used or new, identical partnumber), fit it and expect it to work, or is each phone control unit specific to the car? To be clear, the part that needs replacing is partnumber 997 646 208 13.

I'd appreciate any help someone could give me on this, to help avoid a large Porsche main dealer charge!



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I suspect you would never use the phone in the car. You have a cell right? Do your self a favor and ditch the PCM. Its performance is poor relative to even moderately priced aftermarket head/Nav units. In response to a bad battery my PCM electrocuted my speed yellow instrument cluster, the gateway module and the PASM computer to the tune of $9000 happily warrantied. With the available aftermarket installation kits the replacement will look factory right down to that stupid silver/gold finish on the plastic. The cost of fixing/replacing your PCM will more than justify replacing altogether.

There is one kink that you should be aware of and that is the PCM is connected to the rest of the car via a MOST fiberoptic loop which is digital. The aftermarket Nav units only have analog outputs. BUT, a company call NAV TV makes what they call a MOST head unit replacement module which is an analog to digital converter that outputs in MOST digital. Just plugs right in. This way your get to use the stock amps and speakers which if you have the BOSE option is a terrific deal.

I have the Bose system in my car and installed an Alpine INE W927 HD along with the NAV TV unit. The sound is way better and now I have the best Nav, Bluetooth for the phone and flawless iPod integration. The system has been in the car for a year and has not sneezed once.


Edited by Mijostyn
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That's a tough one to find anything about on the net except that it's a costly unit and buying a used one could be an expensive crap shoot. If you want to continue using it as your phone interface dealer could tell you best. A cheaper approach for BlueTooth interface would be to replace it with an after market unit like the Dension BT500 for about $ 500 ( give or take ) Installing it calls for disconnecting the stock unit, it functions the same way and maintains the full functionality of your PCM. Can be done as a DIY project and there are lots of DIY's on it available.

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