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V1 2006 NA Manual Donor Data Wires

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GrantSmith6

Active Member
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I am struggling through my wiring harness right now and am nearing the end of the videos but I have a problem with the data wires that Ive been putting off but I feel like I should address is now. I have the twisted data wires on the dash side of things, but when I was labeling on the body side and cutting out the connector, I never had any data wires on that end. Any ideas on a wiring diagram or where I attach the dash side data wires to? Also how crucial are they in the build as I don't know what "data" they are transmitting or how important they are for operation. I greatly appreciate any and all suggestions.
 
Traé
In part 4 in the video details there is a pdf of the labels. You could check those pin locations on the base model sheet.
 
Rttoys
The data wires are very important. The ECM, BCM, VATS and such all have to ”talk” to each other or you’ll be shut down. Ross will be along shortly with wiring diagrams.

might want to tell us what your doner car was.
 
G
So my donor was a 2006 Cobalt LT with the manual transmission. I guess to be more specific to my problem, I went back through my box of wiring components and found the body plug connector. I had all the labels from the video and I was able to put them all on except for the twisted tan data wires. Looking at the plug, there are not any cut wires at all in pin locations C5 or C6, so this is why I cant figure out where to extend my dash twisted tan data wires to. So could I possibly get an explanation on where the data wires run to? I will attach a photo of my body connector.
45182
 
Traé
Watching through the videos again there are data wires that run from the electronic brake controller and go to the ECM. These are snipped when the EBCM is removed and you solder on an extension a few videos later. As to what PIN it goes to I’m not sure.
 
Ross
I don't have a wiring diagram for your car, but on my 2006 SC 2.0L, the GM high speed LAN wires go:
Starting at the OBDii port, to the power steering module, to the body control module (BCM), ending at the powertrain control module (PCM). The exact pins are listed here.

I'm having a hard time understanding where you issue is in the wiring harness. That connector in your picture doesn't look familiar to me.
 
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Firstly is the PCM the same as the ECM as I am unfamiliar with the PCM if it is in fact different. I guess to try to give more clarification to my issue, I traced the wires from the OBD2 to the power steering, then found the twisted dark brown wires that go to the BCM, and then the twisted tan wires that come out of the BCM and those are what I have labeled as the dash wires. That is where is ends and Im trying to figure out where I need to extend them to in the main harness. Also if it helps its the first part in part 10 of the new wiring videos.
 
Ross
Yes, the PCM is often called an ECM. The wires from the BCM should go to the PCM blue connector, pins 1 & 2, on my car.

BCM, J2/C2, pin 2tan/black stripHigh speed GMLAN serial data +Goes to PCM, C1, pin 1 (C1 is the blue connector on the PCM)
BCM, J2/C2, pin 20tanHigh speed GMLAN serial data -Goes to PCM, C1, pin 2
 
G
Oh my gosh I just checked my bin and found the connector you are talking about. Mine looks slightly different as I have a yellowish/tan wire with a black stripe instead of the brown like yours, then I do have a green wire, and then another yellowish/tan wire twisted with a tan wire with an orange stripe. Do you have any idea how these connect? Also are there any other discrepancies that you noticed when wiring the harness from the videos?

In regards to your help Ross, I took a look at my PCM connector and found that I have a light blue and purple wire in pins 1 and 2.
 
RGSkid70
On my build, the mating connector was in the engine harness near the ECM, and it had the same color wires. I made sure the two connectors followed the same pin-outs. The tan wires with stripes are the data wires. There was an extra wire with no corresponding mating wire in the engine harness.
 
A
I believe the four wires in the engine harness plug, the 2 twisted brown are the data pair and the green goes to the reverse light switch on the trans. All 3or 4 from/in the engine harness in that separate plug by the brake booster originally. You should re-use that connector for those wires so you are able to unplug the engine harness from the other harnesses. Soldering your "Goblin" harness wires to the engine harness wires together would be functional, but would pose a problem if/when you remove the engine/trans. I have some of those plug ends if you can't find yours, message me.
 
RGSkid70
What AhBnormal said. On the engine side, the green wire goes to the transmission switch. On the body harness side, it goes to one of the BCM connectors. I can't access my wiring diagram now to tell you which one. The brown wire (missing in my engine harness) is most likely something my donor didn't have, like maybe the cruise control.
 
G
I do in fact have the connector for the body side of the harness that plugs into the engine harness. I just need to figure out now where to run the green wire with the white stripe. Ive been looking at wiring diagrams and cant seem to find a wire that is green with a white stripe so maybe I dont need to connect this or maybe it goes towards the fuse box? I found a wire in one of the diagrams that goes into F6 C2 in the fuse box. Does this seem correct at all? It seems to be part of the fuel pump relay.
 
Ross
I would identify the loose green/white wire before guessing at where it should go.
Here is a DK GRN/WHT wire on the BCM.,C1,36. To test if this is the loose wire, do a continuity test on both ends.
45193


Here is another potential DK GRN/WHT, on BCM, C1, 70.
45194


It could be fusebox, connector B3, wire C3.
45196


I didn't search all GRN/WHT wires... but you get the point, it could be lots of places, and we need to know which one it is.
These diagrams came from here.
 
G
As suggested I got the subscription to AllData and last night I was combing through wiring diagrams and comparing with my wires and coming from the engine to the connector in question is a light green wire and I found a light green wire on the wiring diagram that seems to make sense. I now need to dig in to the harness again later tonight and I'll check with a multimeter to see if that path makes sense and if there are any wires that are missing another end. Here is the wiring diagram I was looking at. My donor was a coupe so thats the path I'll have to check.
45215
 
A
GrantSmith6 said:
As suggested I got the subscription to AllData and last night I was combing through wiring diagrams and comparing with my wires and coming from the engine to the connector in question is a light green wire and I found a light green wire on the wiring diagram that seems to make sense. I now need to dig in to the harness again later tonight and I'll check with a multimeter to see if that path makes sense and if there are any wires that are missing another end. Here is the wiring diagram I was looking at. My donor was a coupe so thats the path I'll have to check. View attachment 45215
Click to expand...
Great! On a side note this thread has just given me info that will simplify one of my wiring jobs! Helping only me really, thanks for the help. :cool:
 
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