Replace Stereo PCM Nav?

[rogerjohnsen]

This may be a silly question but am hoping someone can shed some light... I have an '04 911 Turbo with the PCM / Nav / Bose system but the previous owner doesn't have the NAV discs. I was thinking about going with an aftermarket stereo as I did in my 986 S, however, that car only involved changing out a CDR-23, changer and stock amp. The turbo is a little bit more complicated from what I can tell because of the stability management (PSM). I see the head unit displays GPS, temperature, etc. data and don't know if replacing the head unit will have unforeseen ramifications - in particular with the PSM. I've seen posts where people have done it but have gone through shops for the change while I'm planning to be more hands-on with the project as dictated by lack of funds. I'll be sure to keep the MOST in place should anyone ever want to go back to stock but am just trying to avoid any unforeseen land mines before getting into the swap. Any advice is greatly appreciated!

[Richard Hamilton]

PSM isn't connected to PCM at all.

[rogerjohnsen]

Good to know - In that case I guess it's curtains for the PCM... ;)

[rogerjohnsen]

Removed the PCM, stock amp and CD Changer and replaced with a Kenwood Nav unit, Kenwood Mono Amp and 8" Kenwood sub in the cabriolet's bassbox. Huge improvement in the sound, looks, functionality. Thanks again for clarifying the PCM question for me.

[darrinsmith]

Removed the PCM, stock amp and CD Changer and replaced with a Kenwood Nav unit, Kenwood Mono Amp and 8" Kenwood sub in the cabriolet's bassbox. Huge improvement in the sound, looks, functionality. Thanks again for clarifying the PCM question for me.

Hi

I am about to embark on the same thing on a 04 Turbo Cab

Is it necessary to "delete/disable" the PCM in the MOST ring using the Porsche system tester, or is it ok just to swap everything out and patch the optical ring where the PCM used to be.

Thanks

DS

[rogerjohnsen]

Removed the PCM, stock amp and CD Changer and replaced with a Kenwood Nav unit, Kenwood Mono Amp and 8" Kenwood sub in the cabriolet's bassbox. Huge improvement in the sound, looks, functionality. Thanks again for clarifying the PCM question for me.

Hi

I am about to embark on the same thing on a 04 Turbo Cab

Is it necessary to "delete/disable" the PCM in the MOST ring using the Porsche system tester, or is it ok just to swap everything out and patch the optical ring where the PCM used to be.

Thanks

DS

That's a good question - I only swapped everything out unplugging the fiber connectors (3) and plugging the ends. Is there a way to disable the PCM using the system tester?

[Loren]

Removed the PCM, stock amp and CD Changer and replaced with a Kenwood Nav unit, Kenwood Mono Amp and 8" Kenwood sub in the cabriolet's bassbox. Huge improvement in the sound, looks, functionality. Thanks again for clarifying the PCM question for me.

Hi

I am about to embark on the same thing on a 04 Turbo Cab

Is it necessary to "delete/disable" the PCM in the MOST ring using the Porsche system tester, or is it ok just to swap everything out and patch the optical ring where the PCM used to be.

Thanks

DS

That's a good question - I only swapped everything out unplugging the fiber connectors (3) and plugging the ends. Is there a way to disable the PCM using the system tester?

Yes, but you will need access to a PST2 or PIWIS tester.

[darrinsmith]

Thanks Loren, that was my understanding.

Roger, what problems, if any, did not disabling the PCM cause in your car, given there will be no screen to display errors on.

(It just may be a while before I can get to a shop with a PIWIS so if the problems are bad, i may hold off on the installation so i can make time to get the car in).

Thanks!

DS

[rogerjohnsen]

I haven't run into any problems without the PCM but sounds like I should have the dealer disable it as described to be on the safe side.

BTW - It would be good to know what if any effect this has on the car for future reference in the event others decide to go aftermarket with their sound system.

Edited November 25, 2010 by rogerjohnsen

[DocWong]

Hi Roger,

Thanks for posting photos of your mods! Which Kenwood model is that you installed. I'm looking into installing a double DIN setup too with Nav, etc.

So basically what did you like about it and would you choose another if given the chance.

Thanks!

Doc

[rogerjohnsen]

Hi Roger,

Thanks for posting photos of your mods! Which Kenwood model is that you installed. I'm looking into installing a double DIN setup too with Nav, etc.

So basically what did you like about it and would you choose another if given the chance.

Thanks!

Doc

I went with the Kenwod DNX 9140. I like everything about it but the DNX-9960 is out and the user interface is a little better.

[darrinsmith]

Hi again Roger,

Where is the Cab's bass box located?

Is it in the front trunk?

Thanks

Darrin Smith

[rogerjohnsen]

Hi Darrin - The bass box is located in the passenger footwell along the center console (at least for the Bose option) and has a small downward firing sub in a ported enclosure. It's held in place by two torx screws.

[jorligan]

Looks great. Did you have to buy a mounting bracket / fascia or is that the factory fascia since it really fits perfectly.

[rogerjohnsen]

Looks great. Did you have to buy a mounting bracket / fascia or is that the factory fascia since it really fits perfectly.

I ended up just using the cover that came with the stereo and it worked fine. I wasn't sure about how it would look but once installed was happy with the appearance.