I have a 2005 C2 with bose, nav and CD changer. Unfortunately, I seem to have some hybrid of PCM 2.0 and 2.1. My head unit does not have a phone button. I am considering purchasing an updated OEM headunit with a phone button. Any idea if that will work and allow me to use the more up to date Dension 500s? I am still reeling at spending $2k for an aftermarket unit. Thanks!

 

Essentially, all the 2005 cars got the prototype PCM. It lacked the phone area buttons and function.

I would simply give your local dealer a call to find out if the new part number (997.1 cars) will be backwards compatible to your wiring. I suspect it will be, but there is always the possibility that a new wiring harness was also called out in that evolution.

 

I have two 2005s that both seem to have the phone buttons, unless you're talking about a different phone button than the "TEL" button in the row under the screen, the phone graphic button on the multi-function buttons and above the dial pad #s, and the SIM card slot and dial buttons on the left of the PCM screen. Photos is of mine - wife's looks the same.

Not questioning your knowledge, just trying to build mine. Thanks.

 

mine's 05 as well and has the phone buttons as well. however what sucks is that there is no mp3 support.