user 8298308

So the single DIN classic radio can be installed in, say, a 1999 996? I'd much rather have the single DIN than the PCCM+.

Celbrett

I just unbuttoned the unit and unplugged the yellow connector. There is no clock sync, the buttons do not illuminate and the unit will not shut off (turn on) with the ignition (setting to off in the menus). I think the choice for night mode / day mode vs auto was greyed out but went through that quickly. The faults still exist and its too early to tell if the odometer issue is resolved. I would think that we would need some programming to sync the new unit coming from a CDR23 but I don't have a unit to test that theory.

p73rs

Thanks for this. This is very good information, and it makes sense.

By removing the yellow connector, PCCM plus was removed from CAN bus. PCCM plus was causing the problems, so the cause was isolated. The two cases of A/C blowing hot air were resolved. I suspect that the onboard computer resetting problems stops, too, because there was nothing wrong with the car prior to PCCM plus. The point is that all of the broken functionality of the car is restored.

The other side of the story is the functionality within PCCM plus. Again, some of the functionality within PCCM plus should be gone, like the automatic turn on/off, the day/night mode, the light in the buttons, and so on. This is because the car and PCCM plus are no longer communicating each other without CAN bus connection. These are still faults in terms of the user experience, but they are different from the faults in the car.

In fact, for the case at CAI with the A/C problem, the accessory power was tapped for the automatic turn on/off. The illumination was tapped for the lighting.

The audio signal is still connected by MOST controller. The power is hooked up. So, the audio function and the navigation should still work.

I think this is design flaw. The real fix probably requires software/firmware update, if not the re-design. The dealers and Porsche Cars North America do not acknowledge any problems. According to the dealer, mine is not defective.

It is all theory, but it is holding up so far. I hope someone who knows what is going on will provide us answers and solutions soon.

mffarrell

I am not experiencing any of the problems some of you are having. I installed one of the first PCCM + units to hit the US market in MY 2003TT. I originally had a Bose CDR23. When I installed, I used my PIWIS 2 to configure as a PCM 2.0 and also added navigation to the instrument cluster so turn-by-turn directions now appear in the cluster.

Celbrett

That is exactly what I wanted to try if I can track down a PIWIS.

p73rs

What does it mean by "configure as a PCM 2.0?" The original head unit in my car is PCM 2.0. It looks like you have got MOST. Mine does, too. Also, mine is one from the first shipment at the dealer.

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I am hoping for the replacement unit because mine can be defective. It is a good start. According to PCNA and the dealers, any warranty work needs to be processed through the service department at the dealer, regardless of how it was purchased (as parts from the parts department or as an installed product from the service department). For the warranty process, the dealer checked all the connections. There was nothing wrong. The dealer told me that if I mess up any of their work, the warranty is void. I am reluctant to touch it now.

The dealer said the engine would start, I could drive the car, PCCM plus would turn on, and I could listened to the radio. That is pretty much where this warranty process is at. I should have gone to a different dealer. Even, PCNA suggests that. I still can, but a new diagnostic/warranty case needs to be started with 5-6 hours of labor costs. It is getting difficult to spend anymore money into this product under warranty.

This situation is turning into like IMS for 996 or the oil lead for 964. Not everyone is experiencing the problems. If you have got the one working, that is great. Otherwise, it is very difficult to deal with. Apparently, I am having bad luck. Thanks for reading my frustration.

mffarrell

I am sorry to hear that you are experiencing problems. What exactly are your issues?

p73rs

Rebooting of the unit itself randomly (occasionally)
Resetting of the onboard computer randomly (frequently)
GPS and RBDS clock sync problem
Random display of turn-by-turn direction without active routing
The problem with the A/C panel illumination
The way PCCM plus turning on/off (possibly a part of the features but never confirmed)

Again, the dealer said I could drive the car and listen to the radio. So, everything is OK according to them.

mffarrell

The yellow connector provides:

1. Power on/off Control of PCCM through the ignition switch
2. clock and gps data synchronization
3. Navigation data feed to instrument cluster
4. Lighting control to PCCM through light switch

I would be curious to see what happens when the yellow connector is disconnected. The random booting would make me think that the PCCM is defective.

When the AC panel illumination malfunctions, does the lighting on the PCCM buttons also fail?

Frank Edens

Thanks. Mine is 2004 so set to CAN. If not right let me know.

Frank Edens

There is occasional where it turns off asthmatically but not enough to really be a problem. My air worked fine after I disconnected the yellow plug and can't see any difference in the functionality. But what wires do what of the above?

p73rs

I am sure all of the problems within the car, like resetting the onboard computer, will go away. I thought about that in my posting, #153, of this thread.

The problems within PCCM plus (including rebooting) are more than likely the glitches in PCCM plus. So, the replacement unit should be tried. I am at the mercy of the dealer, which indicates my car and PCCM plus are working fine. I am stuck with this PCCM plus for now.

In my car, the A/C panel display illumination is slaved to the display illumination of PCCM plus. They go bright or dim together. They are too bright during the night time. (The headlight is on because it is dark. This is important. The car needs to be in the night mode.)

So, I turn off PCCM plus with the hope that the brightness control reverts back to the pre-PCCM plus installation. (The brightness for the three digital displays in the instrument cluster and the A/C panes display could be controlled by the brightness control at the upper left side of tachometer before, with the headlight turned on or in the night mode.) With PCCM plus turned off, the brightness of the A/C panel display goes to the brightest and gets stuck there.

If the brightness of the three digital displays in the instrument clusters is turned down, it is very obvious. This needs to be done in the complete darkness, too, because there is a light sensor. The headlight needs to be on as well. Hopefully, it makes sense.

This is the illumination problem. The lighting on the buttons works fine.

mffarrell

Attached, is the pin-out for the yellow connector. One of the CAN comfort pins is from the ignition key that controls power to the PCCM. I believe the other CAN comfort pin is used for, clock, gps, lighting and navigation synchronization, and key code in C6 is the security code from the imobilizer to unlock the original CDR23 or PCM, but I am not 100% sure.

Bxstr

For anyone looking for one but doesn't want to pay retail, Suncoast has an open box unit available. $1150.

https://www.suncoastparts.com/product/skurkpccmp.html

Landscraper

@mark_mia

I came across this post that shows access to a 'hidden menu' option to disable the NHTSA message. Are you able to access this?

http://www.911uk.com/viewtopic.php?p=1603948