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Old 08-20-2015, 05:07 PM   #1
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Trying to Install a PCM 1 Head Unit - Need help

First, let me get it out of the way. I am different. I had a Kenwood double din unit with navigation, a Parrot blue tooth, Sirius and a rear camera. Nice, but to me, they just didn't fit the car. The PCM unit with its cassette player (IMHO) does. Odd, I know.

I bought a working PCM head unit and navigation driver from a fellow 986 Forum member. My plan was (is) to install just the head unit of the PCM. I don't want or need the outdated navigation of the unit. The plugs for the stock CDR 220 are a match for the top plugs of the PCM. However, when I plug in the PCM it doesn't power up. A single din unit works fine so I know the plugs are good.

My thought is that both units need to be hooked up. I am trying to get it working without using the white plug on the nav driver or the bottom blue and black plugs on the PCM unit but I am not sure it's possible. I have searched the net and can't find a fix for this or wiring harness to connect the two.

Any suggestions are welcome.





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Old 08-20-2015, 08:50 PM   #2
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Is PCM Retrofit really impossible? - Rennlist Discussion Forums

It sounds like someone did it. But this is an old thread and does not have much detail.
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Old 08-21-2015, 01:41 AM   #3
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Power

Black Connector, Pins 13, 26 = 12V constant

Black Connector, Pins 6, 19 = ground

Blue Connector, Pin 2 = 12V (BK at ignition)

Blue Connector, Pin 3 = 12V (OR wire at radio connector)

Black Connector, Pin 11 = backlight dimmer (GR/BL at radio connector)


Info

Black Connector, Pin 24 = speedometer (GR/PK wire on radio connector)

Black Connector, Pin 21 = Gauge Cluster (VI)

Black Connector, Pin 20 = clock, Gauge Cluster, black connector, pin 6 (GR/YE)

Blue Connector, Pin 15 = Climate Control Unit, beige connector, pin 12 (BK/GR)

Last edited by particlewave; 08-21-2015 at 02:22 AM.
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Old 08-21-2015, 07:07 AM   #4
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Quote:
Originally Posted by particlewave View Post
Power

Black Connector, Pins 13, 26 = 12V constant

Black Connector, Pins 6, 19 = ground

Blue Connector, Pin 2 = 12V (BK at ignition)

Blue Connector, Pin 3 = 12V (OR wire at radio connector)

Black Connector, Pin 11 = backlight dimmer (GR/BL at radio connector)


Info

Black Connector, Pin 24 = speedometer (GR/PK wire on radio connector)

Black Connector, Pin 21 = Gauge Cluster (VI)

Black Connector, Pin 20 = clock, Gauge Cluster, black connector, pin 6 (GR/YE)

Blue Connector, Pin 15 = Climate Control Unit, beige connector, pin 12 (BK/GR)
Cool, thanks.... As Dirty Harry stated, "A Man's Got to Know his Limitations". No way I am going to be able to re-write the plugs to get this thing powered up on my own. Plus, I need to get the black and blue plugs or wiring harness.
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Old 08-21-2015, 08:04 AM   #5
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Chuck,
You shouldn't have to have the CD reader connected for power. I actually took a pic of this when I was removing it, for some reason!

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Old 08-21-2015, 08:12 AM   #6
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Quote:
Originally Posted by alm001 View Post
Chuck,
You shouldn't have to have the CD reader connected for power. I actually took a pic of this when I was removing it, for some reason!

Thanks Andrew!

I am betting that the wiring harness is different when the factory installs the PCM. Plug A wire 7 is powered on the CDR radios and not on the PCM units. But, your photo shows me that there should be a work around for this.

I am betting if I can figure out which wire powers up the PCM head unit I can jump my wire 7 to it.

But then, I have read that others have plugged CDRs into their PCM wire harnesses and they work... ugh.
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2016 BMW M2, 6 Speed LBB - ED 7/2016
1997 993 Cab - Sold; 1997 993 Turbo - Sold
2001 Boxster S - Original Owner - 30K Miles -SOLD

Last edited by Chuck W.; 08-21-2015 at 08:14 AM.
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Old 08-21-2015, 10:27 AM   #7
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I traced the wiring diagram and most of the wires on the blue and black connectors run to either the cd reader or telephone. Those that I listed are the few that don't. I have no idea which have to be connected for it to power up, but I'd guess at least those listed under "power".
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Old 08-23-2015, 09:03 AM   #8
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Thanks for all the replies.

I have the wiring diagram for both the CDR and PCM and worked all day Friday jumping pins. I did get the face buttons to illuminate, but that was it.

I contacted two pro audio shops that specialize in Porsches. They said without the right harness, its not going to happen. One post I found said that it was done and was so difficult they never would have attempted it if they knew what they were getting into.

It appears that Porsche would make the cars harness to fit the options on the car. The PCM doesn't just operate the radio and navigation, but also taps into the A/C, reads the outside temperature and more.

It was a good effort and IMHO, the unit would have looked great in the car, but alas, it is not to be.

I am going to go back to the cars original configuration of A/C controller on top, then a CDR220 (or CR220) radio, then the storage bin and the DSP. Unfortunately, when I put the double din in I sold the CDR radio and gave the bin away. I'll start a new WTB post.

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