MattCarp

Does anyone have the pinout on the CR-1 CD changer output?

This is the 13-pin DIN female connector on the back of the radio.

The CDC-1 CD changer has an 8-pin DIN female input.

I'm trying to set up a CR-1 + CDC-1 on my workbench, but don't have the connecting cable. I just need to know the connections to make my own cable.

I opened my CDC-1 and the circuit board had the signal names silk screened, so I know the 8-pin. No such luck with the CR-1 radio.

Of course, if someone has a surplus cable that they'll let go for cheap, PM me!

Thanks, Matt

Rob Edwards

The CR-1 radio was paired with the CDC-1 in US/Canada 928s, the ROW cars got a CDC-1 with a Blaupunkt Bremen RCM42, at least according to the radio page in the '94 wiring diagram.

I cannot find a Bremen RCM42 anywhere in the entirety of the internet, so either it was a Porsche-only thing or it was a misprint and they meant Bremen RCM 43.

There's only 1 part number for the CD changer cable in PET, so if the same cable works on the CR-1 and the RCM42/43, you might consider taking a gamble and bidding on this German Ebay auction, which includes an RCM-43 and a CD changer cable, with a Blaupunkt CD changer thrown in for free. What could possibly go wrong?


http://www.ebay.de/itm/Autoradio-Bla...item35e39bc51d

Or you could gamble € 1.50 and hope the pinout for the CD-changer cable is in this owner's manual:

http://www.ebay.de/itm/BLAUPUNKT-Cas...item46324aac03

Rob Edwards

Or you can spend some time tracking down this guy, who was smart enough to figure out the pinout but not smart enough to post a Word document on Pelican parts:

http://forums.pelicanparts.com/porsc...ger-cable.html

MattCarp

Excellent advice and help, Rob! Thank you!

I've reached out to the guy on Pelican. I'll see what he may have learned.

Interesting vector on the RCM42/43. I bet you're right, it's probably a misprint on the 928 wiring diagram. It's possible I could find some information on the RCM43 and make the jump that it's the same interface out of the radio.

If anyone else catches this thread and have an extra CD changer cable, I actually don't need the cable, but just need the wiring diagram (i.e., the cross connects).
The part number is 928.645.450.00

Actually the wiring diagram is unusual. It shows one cable from the radio, an intermediate cable, then a cable to the CD changer. It's possible the 13-pin to 8-pin connection was done at any point along the way.

If I learn anything, I'll leave the breadcrumbs here.

Thanks again.

Rob Edwards

Bit of an update- I picked up a CD changer cable from a fellow 928er, from his '94 GTS. It is 928 645 450 00:

Connected up between a CR-1 and a CDC1:




Here are the ends of the connector:



And the pin continuties:



There was a second cable in the bag, I'd guess this is the head unit to 6-channel amp connector.

There are 2 different subtypes of CR-1 head units, one for 928s (964 645 014 00) with an 8-pin DIN cable to connect to the 6-channel amp:



And a 993 version (993 645 014 00):




So here's the 'other' cable in the bag, I wonder whether this particular '94 GTS had the 993 version of the CR-1 (?) No idea.

siscogts

first of all, the rcm43/cd changer auction is won by me.....!I really wanted a complete set for a 1992 european car.

I have a rcm 43 for sale in Italy, as faulty( cassette wont go properly ).Well, I have also a London RDM 42 for sale with faulty cd(simple to fix, if someone can tell me where I can find those poor made plastic clip that keeps together mechanical cd insert/eject parts), but this is another story.



and I have a link to pinots that usually worked well with Porsche stuff related

http://www.selfmadehifi.de/hifi/kfz-hu.htm

The RCM43 I have on my car has the rear plug with 13 pin connector, with the 13 pin cable that goes to the Blaupunkt cdc a 05 changer( a really good unit, actually), not Porsche original, but really the same for dimensions and wiring.maybe some of your plag are for euro market and Others are for US market?

MattCarp

Awesome stuff!

Ok - I have to confess. I do have a CDC-1 and cable installed in my 928. When I bought the car I replaced the head unit with a modern Blaupunkt Bremen MP78 but left the CD changer and connecting cable installed. I have a second CDC-1 for hacking and my original CR-1 on the workbench.

So, probably at the same time you investigated the units, yesterday I pulled the interior panel off and developed the same wiring cross connect table that you have listed in this post!

However, let me add to it with the signal descriptions, using your 8-DIN numbering diagram:

1 - Data
2 - Audio signal ground
3 - Data ground
4 - Right channel audio (low level analog)
5 - Left channel audio (low level analog)
6 - Battery (+12V)
7 - Accessory power (+12V)
8 - Ground

Next, I used a digital oscilloscope to watch the data line. The conclusion should be obvious considering that this is made by Alpine and the era, but it appears to be using the Alpine M-bus protocol. I'm going to fool around with it more to confirm that, but I've been able to see the head unit to CDC "ping" and "ping OK" response.

There is almost nothing on the net about M-bus, except one very excellent resource: http://www.hohensohn.info/mbus/

This is all academic, since the Bremen accepts streaming audio input over Bluetooth, but it might be interesting to interface the old CDC-1 with my Bremen.

FWIW, my '94 928 CR-1 had the square connectors to the amplifier (993 version). I know the previous owner had a custom stereo installed. I believe the PO or seller replaced it with the equivalent original.

So, I'm going to play a bit with the bench top setup and scope and further confirm the head unit to CDC-1 communications.

Again, thank you for confirming that cable. This may be a resource for someone who needs a replacement, because the original equipment is either not available, or sellers expect a crazy price (I've seen $100 and $257 for just the cable!).

MattCarp

Yep - I just clicked on your page. I've figured out what you've already known! Thank you for linking and providing that resource.

As far as the plastic clip you need- I've had luck molding and then using plastic resin to duplicate plastic gears. If you have an unbroken plastic clip available, you can mold it in a silicone mold, then cast a replacement.

I'm not sure the availability of these items in Italy, but I am able to get silicone molding and casting resins at art supply stores like Hobby Lobby and Blick Art Materials.

Certainly the original part is injection molded polyethylene or propylene, but depending on how the clip is used, a resin cast replacement would work fine.

Green Dragon

Hello,
I am trying to solve similar problems as described here and that is that I have an original porsche CD-10 radio which I want to install back to my 928. It was substituted with a blaupunkt and the original porsche radio was left in a box with no cables.
I hope somebody can guide me as to where I could get the wire harness and connectors and whether this CD radio would require an antitheft code. (Pictures attached).
Thanks.

Rob Edwards

I do not know with certainty that a CD-10 requires a code, but I will bet 99% that it does. Looking at the power connector on the CD-10, If you apply 12V to the 2nd and 4th terminals from the bottom, and ground the 1st terminal, the radio should power up when turned on. If it says 'CODE' on the screen, then you will need to find a radio repair place that can decode the code for you. There is a good place here in California that will do it for $60.

Here's the power connector pinout on a CR-1, which is identical to a CD-2, which I will bet is identical to a CD-10.

diccaesar

Hello Are you able to tell me if the pin outs 8 to 13 would work for a CDC1 (964)? thanks

Chuck Z

I know this is an old thread but, does anyone know what pins 1-8 (6&7 are blank) for a CR-1 amplifier? I have the call outs for the yellow connection to the C bank on the back of the CDR 220?

MattCarp

Hi Chuck,

Here's the section from the wiring diagram. Six wires. I think you've got four audio signals, one audio ground, and maybe one power on signal from the CR-1. I don't know which is which...

You can probably determine which one is the power on signal with a multimeter. Ground your multimeter to the car, turn on the radio, turn down the volume, and look for a steady ~12v (or 5v?) signal to be the one to tell the amp to turn on. The other five.... I'd then turn up the volume half way and then look for the ground. The ground should be a steady signal, likely 0v or near 0v. The other four are the audio channels. You can probably figure out which is which with some headphones and the balance/fader....

Of course, once you decipher that, it would make a great rennlist post!