08-20-2015, 04:07 PM
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#1
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Registered User
Join Date: Sep 2008
Location: Agoura Hills (LA) So.Cal.
Posts: 1,574
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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 I don't want or need the outdated navigation of the unit.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.
__________________
1995 Porsche C4 Cab
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
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08-20-2015, 07:50 PM
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#2
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Registered User
Join Date: Feb 2006
Location: Virginia
Posts: 1,659
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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.
__________________
2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 12-way driver & 8-way passenger seats, Litronics, silver console
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08-21-2015, 12:41 AM
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#3
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Custom User Title Here
Join Date: Mar 2012
Location: Ft. Leonard Wood
Posts: 6,163
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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)
__________________
https://youtube.com/@UnwindTimeVintageWatchMuseum
Last edited by particlewave; 08-21-2015 at 01:22 AM.
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08-21-2015, 06:07 AM
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#4
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Registered User
Join Date: Sep 2008
Location: Agoura Hills (LA) So.Cal.
Posts: 1,574
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Quote:
Originally Posted by particlewave
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)
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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.
__________________
1995 Porsche C4 Cab
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
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08-21-2015, 07:04 AM
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#5
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01101
Join Date: Jul 2015
Location: CT
Posts: 587
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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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08-21-2015, 07:12 AM
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#6
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Registered User
Join Date: Sep 2008
Location: Agoura Hills (LA) So.Cal.
Posts: 1,574
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Quote:
Originally Posted by alm001
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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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.
__________________
1995 Porsche C4 Cab
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 07:14 AM.
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08-21-2015, 09:27 AM
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#7
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Custom User Title Here
Join Date: Mar 2012
Location: Ft. Leonard Wood
Posts: 6,163
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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".
__________________
https://youtube.com/@UnwindTimeVintageWatchMuseum
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08-23-2015, 08:03 AM
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#8
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Registered User
Join Date: Sep 2008
Location: Agoura Hills (LA) So.Cal.
Posts: 1,574
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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.
__________________
1995 Porsche C4 Cab
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
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02-02-2023, 09:41 AM
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#9
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Registered User
Join Date: Feb 2023
Location: Greece
Posts: 1
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PCM installation
Hallo everyone.
Just signed on this group...No idea if you still have your boxster but it must be an easy project.I am sure there is no need for Navi rom or any other complicated cable in order just to operate the PCM as a radio unit.....Have a look! 
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02-02-2023, 10:51 AM
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#10
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Registered User
Join Date: Sep 2008
Location: Agoura Hills (LA) So.Cal.
Posts: 1,574
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I worded on this for months and couldn't get anywhere. I took the Boxster to a high end audio store that specializes in high end cars. They told me that the wire harness that Porsche used for Boxster's with the nav head unit is completely different that the others. I am sure a very talented tech could have cut and pasted to make it work, but in the end I couldn't justify it.\
The Boxster S is sold and I miss it. The 993 cab I got to replace it helps.
__________________
1995 Porsche C4 Cab
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
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