I am removing a later radio and installing a correct CR-2001. I'm sure the later installation likely compromised the factory wiring. But I was surprised to find the original harness intact. Both speaker plugs present, a brown ground wire and the red lead (not hot as it should be, likely hacked to feed the newer radio). What confuses me is that there is a second red unswitched lighter gauge hot wire coming from the same harness as the radio wires. I see no connection point on the 2001 for a second hot lead. Anyone out there have an idea to share?

 

Jim, you have a 1980 model car? Not to rain on your parade, but I don't think CR-2001 would have been stock for that year?

I can send you the wiring diagram for 1980 audio, they vary a bit depending on whether you still have the fader **** and/or amplifier options. One of the red wires feeds the amplifier, the other powers the head unit. Both were originally fed through some isolation transformers to reduce noise.

 

Andrew, it is apparent that you are the man I needed to find. I chose to buy a 2001 because my car is a very low mile original owner car until 2022. It came to me with much paper work, window sticker (no radio shown) and CR-2001 operator manual, internal schematics and installation instructions, I assumed it had to be correct for the car. If not, I will pretend!
Please send anything you can to jimchambers41@hotmail.com. I have connected the 2001 to the old harness. It will light up and the antenna will raise. No sound however. I am guessing that the newer install tapped into the speaker wiring somewhere but unable to locate the spot. I have factory shop manuals and the wiring diagram shows speaker wires from head unit to "speaker balance" device. The car owners manual shows a balance **** by the parking brake handle. However my car does not have the **** and no evidence it ever existed. Would the balance device be under the brake handle? I can't figure out how to get in there like I could easily expose the 02 device on the other side.

 

Another 928 romance blooms. The power of rennlist.

 

Jim, a CR-2001 certainly could have been installed from new by a dealer. A "Type CR" Blaupunkt is what would have been factory equipped. Similar to this, but with AM/FM buttons instead of the German market radio bands: https://928classics.com/parts-store/...stereo-typede/

If you have the factory books, you already have the same wiring diagrams as I do. Does your CR-2001 have four speaker outputs, or two? That will decide whether you need to track down a front/rear fader ****. They were mounted on the parking brake handle cover, through a small hole that often disappears in the carpet pile. The cover has screws front and rear if I remember correctly.

If you have four outputs on your stereo, you won't need the fader, and just need to track down where the speaker wires have been intercepted previously.

 

Since my original window sticker shows no radio option (I have a real base model, only option shown is auto trans even though I have power seats), it is likely the dealer installed the CR-2001.
My CR has only two speaker outputs and the harness has two of the standard Blaupunkt speaker plugs. No front-rear fader **** but I will probe the carpet for a hole. Is it likely that the mysterious balance device is under the brake cover and maybe that is where the speaker wires were intercepted?
Guess I better try to get under there.

 

OK, I found the hole in the brake handle cover where **** would be if so equipped. Removed the cover and there is nothing under there. I had hoped to find the mysterious "balance" device which receives speaker input from the head unit. Any idea where that might be? I don't think it is in the console and am not anxious to tear into it to look. From what I see through the radio hole, it appears all the wires for the replacement radio disappear under the carpet on the driver side of the tunnel.. I have to think the wires from the multi-pin plug for the new radio go to the balance control. The "new" radio (Blaupunkt Ventura CD-83) uses the stock 4 speakers.

 

Since I have no front rear balance fader and no factory amp, could my two speaker wires run to the front speakers and from them to the rear, i.e.? Maybe I can find which of the wires from the multi-pin connector go to speakers. Ideas appreciated.

 

I think you'll need to trace those wires by pulling carpet and/or the console side panels to see where they've been spliced in. Originally all four speakers are fed from the fader control you are missing. The fader connects inside the console with three white-colored four pin plugs, marked with red, green, and yellow dots on the plugs. That's probably where the wires speakers were intercepted.

 

Thank you Andrew. I wlll do as you suggest. It occurs to me that since I don't have a factory radio, thus no fader or evidence that one ever existed, the head unit must be directly connected to the speakers. The unit I am replacing has 4 pair of speaker wires. Since my CR-2001 has only two pair and no external fader I am curious how the original two pair get to 4 speakers.

 

Andrew, you got it right. I traced the wires under the tunnel carpet to beneath the driver seat. There I found the 4-pin connectors you describe. One female connector is currently unused and the 4 wires are red/brown as on the plugs in the head unit. The eight wires from the newer radio are connected to the other two plugs. I'm guessing they were there for a factory install using a fader. I need to do lots of circuit testing I think.

 

Disconnected female 4 pin under seat is the output from the radio.. Disconnected the fabricated wiring for replacement radio and connected female output to male 4-pin to front speakers. I have sound! There is a 4-pin female to rear speakers but can't connect female output to rear. Probably need the fader to do that. However harness under the seat would never reach the fader location by the brake handle. Only way to incorporate rear speakers is to fabricate a connection. And, left door speaker does not work. Door panel removal in my future.